Using updated astrometry solutions#
As part of an effort to improve the absolute astrometry of HST images, STScI has created multiple new astrometric solutions for ACS and WFC3 images. These solutions are contained in the World Coordinate System (WCS) of the images, as well as headerlet extesions. This notebook provides an example workflow showing how to use/change to a different solution.
The solutions are contained in the exposure files (flt.fits and flc.fits), so no extra files are required. However, these updates were implemented in December 2019 as a part of HST Data Processing version 2019.5. If data were downloaded before that, they can either be redownloaded (and will contain the new solutions) from mast.stsci.edu or via astroquery, or can be updated by connecting to the database cotaining solutions (shown below).
For more information, see the overview page here: https://outerspace.stsci.edu/pages/viewpage.action?spaceKey=HAdP&title=Improvements+in+HST+Astrometry
REQUIREMENT: This notebook was designed around using stwcs version 1.5.3, and python version 3.6. If versions older than this are used the software will likely not work!
NOTE: The new solutions are used by default by the MAST pipeline! Some datasets may have certain solutions such as fitting to Gaia DR2, though other datasets (even in the same visit) may not! Thus, it is crucial to check the which solution (WCS) is active! The easiest way to check which solution is active is to check the WCSNAME keyword in the header of the SCI extensions.
Table Of Contents#
Example Data Download
New Extensions on FITS Files
Exploring different solutions
Applying a headerlet to the science extensions
Restoring the “old” solution
Inspecting alignment
Changing the WCS of drizzled images
import numpy as np
import os
import shutil
import matplotlib.pyplot as plt
from astropy.io import fits
from astropy.wcs import WCS
from astropy.visualization import PercentileInterval, ImageNormalize, LogStretch
from astroquery.mast import Observations
from stwcs.wcsutil import headerlet
from stwcs import updatewcs
from drizzlepac.align import generate_astrometric_catalog
from drizzlepac import astrodrizzle
%matplotlib notebook
The following task in the stsci.skypac package can be run with TEAL:
skymatch
The following tasks in the drizzlepac package can be run with TEAL:
astrodrizzle config_testbed imagefindpars mapreg
photeq pixreplace pixtopix pixtosky
refimagefindpars resetbits runastrodriz skytopix
tweakback tweakreg updatenpol
Because some steps in this notebook require access to reference files, we will create a temporary ‘iref’ directory here to place these reference files after download. This step is typically done by defining the ‘iref’ path in your bash profile so that all reference files for all datasets can be in one static location, but for the portability of this notebook we will just create a temporary directory. Please see the ‘Initalization’ notebook for more information.
os.environ['CRDS_SERVER_URL'] = 'https://hst-crds.stsci.edu'
os.environ['CRDS_PATH'] = os.path.abspath(os.path.join('.', 'reference_files'))
os.environ['iref'] = os.path.abspath(os.path.join('.', 'reference_files', 'references', 'hst', 'wfc3')) + os.path.sep
0. Example Data Download#
Lets find some example HST data from MAST and download it:
obsTable = Observations.query_criteria(project='HST', proposal_id='14689', obs_id='ID7307030')
products = Observations.get_product_list(obsTable)
filtered_products = Observations.filter_products(products, mrp_only=False, productSubGroupDescription=['FLC', 'ASN'])
filtered_products
Table masked=True length=9
| obsID | obs_collection | dataproduct_type | obs_id | description | type | dataURI | productType | productGroupDescription | productSubGroupDescription | productDocumentationURL | project | prvversion | proposal_id | productFilename | size | parent_obsid | dataRights | calib_level |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| str8 | str3 | str5 | str37 | str64 | str1 | str69 | str9 | str28 | str11 | str1 | str7 | str19 | str5 | str52 | int64 | str8 | str6 | int64 |
| 25874804 | HST | image | id7307xfq | DADS FLC file - CTE-corrected calibrated exposure ACS/WFC3 | S | mast:HST/product/id7307xfq_flc.fits | SCIENCE | -- | FLC | -- | CALWF3 | 3.7.1 (Oct-18-2023) | 14689 | id7307xfq_flc.fits | 169032960 | 25874840 | PUBLIC | 2 |
| 25874805 | HST | image | id7307xhq | DADS FLC file - CTE-corrected calibrated exposure ACS/WFC3 | S | mast:HST/product/id7307xhq_flc.fits | SCIENCE | -- | FLC | -- | CALWF3 | 3.7.1 (Oct-18-2023) | 14689 | id7307xhq_flc.fits | 169032960 | 25874840 | PUBLIC | 2 |
| 25874806 | HST | image | id7307xlq | DADS FLC file - CTE-corrected calibrated exposure ACS/WFC3 | S | mast:HST/product/id7307xlq_flc.fits | SCIENCE | -- | FLC | -- | CALWF3 | 3.7.1 (Oct-18-2023) | 14689 | id7307xlq_flc.fits | 169032960 | 25874840 | PUBLIC | 2 |
| 25874807 | HST | image | id7307xpq | DADS FLC file - CTE-corrected calibrated exposure ACS/WFC3 | S | mast:HST/product/id7307xpq_flc.fits | SCIENCE | -- | FLC | -- | CALWF3 | 3.7.1 (Oct-18-2023) | 14689 | id7307xpq_flc.fits | 169032960 | 25874840 | PUBLIC | 2 |
| 25874840 | HST | image | id7307030 | DADS ASN file - Association ACS/WFC3/STIS | D | mast:HST/product/id7307030_asn.fits | AUXILIARY | Minimum Recommended Products | ASN | -- | CALWF3 | 3.7.1 (Oct-18-2023) | 14689 | id7307030_asn.fits | 11520 | 25874840 | PUBLIC | 3 |
| 26303775 | HST | image | hst_14689_07_wfc3_uvis_f814w_id7307xh | HAP flat-field product | D | mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xh_flc.fits | SCIENCE | -- | FLC | -- | HAP-SVM | DrizzlePac 3.6.2 | 14689 | hst_14689_07_wfc3_uvis_f814w_id7307xh_flc.fits | 169148160 | 25874840 | PUBLIC | 2 |
| 26303830 | HST | image | hst_14689_07_wfc3_uvis_f814w_id7307xl | HAP flat-field product | D | mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xl_flc.fits | SCIENCE | -- | FLC | -- | HAP-SVM | DrizzlePac 3.6.2 | 14689 | hst_14689_07_wfc3_uvis_f814w_id7307xl_flc.fits | 169148160 | 25874840 | PUBLIC | 2 |
| 26303880 | HST | image | hst_14689_07_wfc3_uvis_f814w_id7307xp | HAP flat-field product | D | mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xp_flc.fits | SCIENCE | -- | FLC | -- | HAP-SVM | DrizzlePac 3.6.2 | 14689 | hst_14689_07_wfc3_uvis_f814w_id7307xp_flc.fits | 169148160 | 25874840 | PUBLIC | 2 |
| 26303905 | HST | image | hst_14689_07_wfc3_uvis_f814w_id7307xf | HAP flat-field product | D | mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xf_flc.fits | SCIENCE | -- | FLC | -- | HAP-SVM | DrizzlePac 3.6.2 | 14689 | hst_14689_07_wfc3_uvis_f814w_id7307xf_flc.fits | 169148160 | 25874840 | PUBLIC | 2 |
dl_tbl = Observations.download_products(filtered_products, mrp_only=False)
dl_tbl
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/id7307xfq_flc.fits to ./mastDownload/HST/id7307xfq/id7307xfq_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/id7307xhq_flc.fits to ./mastDownload/HST/id7307xhq/id7307xhq_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/id7307xlq_flc.fits to ./mastDownload/HST/id7307xlq/id7307xlq_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/id7307xpq_flc.fits to ./mastDownload/HST/id7307xpq/id7307xpq_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/id7307030_asn.fits to ./mastDownload/HST/id7307030/id7307030_asn.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xh_flc.fits to ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xh/hst_14689_07_wfc3_uvis_f814w_id7307xh_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xl_flc.fits to ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xl/hst_14689_07_wfc3_uvis_f814w_id7307xl_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xp_flc.fits to ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xp/hst_14689_07_wfc3_uvis_f814w_id7307xp_flc.fits ...
[Done]
Downloading URL https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/hst_14689_07_wfc3_uvis_f814w_id7307xf_flc.fits to ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xf/hst_14689_07_wfc3_uvis_f814w_id7307xf_flc.fits ...
[Done]
Table length=9
| Local Path | Status | Message | URL |
|---|---|---|---|
| str103 | str8 | object | object |
| ./mastDownload/HST/id7307xfq/id7307xfq_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/id7307xhq/id7307xhq_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/id7307xlq/id7307xlq_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/id7307xpq/id7307xpq_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/id7307030/id7307030_asn.fits | COMPLETE | None | None |
| ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xh/hst_14689_07_wfc3_uvis_f814w_id7307xh_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xl/hst_14689_07_wfc3_uvis_f814w_id7307xl_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xp/hst_14689_07_wfc3_uvis_f814w_id7307xp_flc.fits | COMPLETE | None | None |
| ./mastDownload/HST/hst_14689_07_wfc3_uvis_f814w_id7307xf/hst_14689_07_wfc3_uvis_f814w_id7307xf_flc.fits | COMPLETE | None | None |
Now to make the paths easier to work with, lets move those files from their default download locations into the same location as this notebook:
for f in dl_tbl['Local Path']:
filename = os.path.split(f)[-1]
if not os.path.exists(filename):
shutil.move(f, '.')
And then download all of the necessary reference files for the images using CRDS (this uses the CRDS paths defined at the top of the notebook, although you would probably want to use a different path for your own data as described above):
for row in filtered_products:
if row['productSubGroupDescription'] == 'FLC':
os.system('crds bestrefs --files {}_flc.fits --sync-references=1 --update-bestrefs'.format(row['obs_id']))
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_wfpc2_wf4tfile_0250.rmap 678 bytes (1 / 141 files) (0 / 1.8 M bytes)
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CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_oscntab_0251.rmap 781 bytes (123 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_npolfile_0253.rmap 3.2 K bytes (124 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_mlintab_0250.rmap 646 bytes (125 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_mdriztab_0253.rmap 769 bytes (126 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_imphttab_0259.rmap 769 bytes (127 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_idctab_0256.rmap 1.5 K bytes (128 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_flshfile_0268.rmap 3.4 K bytes (129 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_drkcfile_0444.rmap 14.6 K bytes (130 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_dgeofile_0250.rmap 3.2 K bytes (131 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_darkfile_0435.rmap 86.6 K bytes (132 / 141 files) (1.6 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_d2imfile_0253.rmap 601 bytes (133 / 141 files) (1.7 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_crrejtab_0251.rmap 945 bytes (134 / 141 files) (1.7 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_cfltfile_0250.rmap 1.2 K bytes (135 / 141 files) (1.7 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_ccdtab_0256.rmap 1.4 K bytes (136 / 141 files) (1.7 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_bpixtab_0252.rmap 1.0 K bytes (137 / 141 files) (1.7 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_biasfile_0433.rmap 56.7 K bytes (138 / 141 files) (1.7 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_atodtab_0251.rmap 528 bytes (139 / 141 files) (1.8 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_acs_0533.imap 1.3 K bytes (140 / 141 files) (1.8 M / 1.8 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/mappings/hst/hst_1153.pmap 495 bytes (141 / 141 files) (1.8 M / 1.8 M bytes)
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing id7307xfq_flc.fits
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/2321606li_bia.fits 174.2 M bytes (1 / 14 files) (0 / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/2731450pi_idc.fits 40.3 K bytes (2 / 14 files) (174.2 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/2ck18260i_mdz.fits 118.1 K bytes (3 / 14 files) (174.2 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/2ck1856fi_bpx.fits 1.8 M bytes (4 / 14 files) (174.3 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/51c1638pi_imp.fits 397.4 K bytes (5 / 14 files) (176.2 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/7b21735ti_sat.fits 174.2 M bytes (6 / 14 files) (176.6 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/7bd1927fi_drk.fits 168.1 M bytes (7 / 14 files) (350.7 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/n9i1435li_crr.fits 11.5 K bytes (8 / 14 files) (518.8 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/q911321oi_osc.fits 25.9 K bytes (9 / 14 files) (518.8 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/t291659mi_ccd.fits 247.7 K bytes (10 / 14 files) (518.9 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/y7b1516hi_d2i.fits 51.8 K bytes (11 / 14 files) (519.1 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/y7b15170i_npl.fits 51.8 K bytes (12 / 14 files) (519.2 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/zcv2054mi_pfl.fits 168.1 M bytes (13 / 14 files) (519.2 M / 757.0 M bytes)
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/zcv2057oi_snk.fits 69.7 M bytes (14 / 14 files) (687.3 M / 757.0 M bytes)
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 157 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing id7307xhq_flc.fits
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 2 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing id7307xlq_flc.fits
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 2 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing id7307xpq_flc.fits
CRDS - INFO - Fetching /home/runner/work/hst_notebooks/hst_notebooks/notebooks/DrizzlePac/using_updated_astrometry_solutions/reference_files/references/hst/wfc3/6c820144i_fls.fits 209.0 M bytes (1 / 1 files) (0 / 209.0 M bytes)
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 3 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing hst_14689_07_wfc3_uvis_f814w_id7307xh_flc.fits
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 2 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing hst_14689_07_wfc3_uvis_f814w_id7307xl_flc.fits
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 2 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing hst_14689_07_wfc3_uvis_f814w_id7307xp_flc.fits
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 2 infos
CRDS - INFO - No comparison context or source comparison requested.
CRDS - INFO - ===> Processing hst_14689_07_wfc3_uvis_f814w_id7307xf_flc.fits
CRDS - INFO - 0 errors
CRDS - INFO - 0 warnings
CRDS - INFO - 2 infos
1. New extensions on fits files#
Using fits.info prints basic information about the extensions in a fits file. In the following examples, we will show operations for one file, though performing the same operations for multiple files simply requires looping.
filename = 'id7307xfq_flc.fits'
If no extensions named HDRLET appear, then solutions can be downloaded from the database (if available) and automatically appended to the fits files using the following command:
updatewcs.updatewcs(filename, use_db=True)
AstrometryDB service available...
Deleted all instances of WCS with key A in extensions [1, 4]
Deleted all instances of WCS with key B in extensions [1, 4]
Wcskey 'O' is reserved for the original WCS and should not be deleted.
INFO:
Inconsistent SIP distortion information is present in the FITS header and the WCS object:
SIP coefficients were detected, but CTYPE is missing a "-SIP" suffix.
astropy.wcs is using the SIP distortion coefficients,
therefore the coordinates calculated here might be incorrect.
If you do not want to apply the SIP distortion coefficients,
please remove the SIP coefficients from the FITS header or the
WCS object. As an example, if the image is already distortion-corrected
(e.g., drizzled) then distortion components should not apply and the SIP
coefficients should be removed.
While the SIP distortion coefficients are being applied here, if that was indeed the intent,
for consistency please append "-SIP" to the CTYPE in the FITS header or the WCS object.
[astropy.wcs.wcs]
- IDCTAB: Distortion model from row 36 for chip 2 : F814W
INFO:
Inconsistent SIP distortion information is present in the FITS header and the WCS object:
SIP coefficients were detected, but CTYPE is missing a "-SIP" suffix.
astropy.wcs is using the SIP distortion coefficients,
therefore the coordinates calculated here might be incorrect.
If you do not want to apply the SIP distortion coefficients,
please remove the SIP coefficients from the FITS header or the
WCS object. As an example, if the image is already distortion-corrected
(e.g., drizzled) then distortion components should not apply and the SIP
coefficients should be removed.
While the SIP distortion coefficients are being applied here, if that was indeed the intent,
for consistency please append "-SIP" to the CTYPE in the FITS header or the WCS object.
[astropy.wcs.wcs]
- IDCTAB: Distortion model from row 36 for chip 2 : F814W
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[2]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[3]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[5]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[6]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[7]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[8]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[9]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[10]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[11]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[12]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[13]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[14]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[15]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[16]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[17]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[18]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[19]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[20]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[21]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[22]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[23]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[2]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[3]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[5]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[6]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[7]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[8]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[9]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[10]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[11]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[12]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[13]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[14]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[15]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[16]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[17]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[18]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[19]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[20]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[21]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[22]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key B [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[23]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'B' was found in the given header [stwcs.wcsutil.altwcs]
INFO:
Inconsistent SIP distortion information is present in the FITS header and the WCS object:
SIP coefficients were detected, but CTYPE is missing a "-SIP" suffix.
astropy.wcs is using the SIP distortion coefficients,
therefore the coordinates calculated here might be incorrect.
If you do not want to apply the SIP distortion coefficients,
please remove the SIP coefficients from the FITS header or the
WCS object. As an example, if the image is already distortion-corrected
(e.g., drizzled) then distortion components should not apply and the SIP
coefficients should be removed.
While the SIP distortion coefficients are being applied here, if that was indeed the intent,
for consistency please append "-SIP" to the CTYPE in the FITS header or the WCS object.
[astropy.wcs.wcs]
- IDCTAB: Distortion model from row 35 for chip 1 : F814W
Updating astrometry for id7307xfq
Accessing AstrometryDB service :
https://mast.stsci.edu/portal/astrometryDB/observation/read/id7307xfq
AstrometryDB service call succeeded
Retrieving astrometrically-updated WCS "OPUS" for observation "id7307xfq"
Retrieving astrometrically-updated WCS "IDC_2731450pi" for observation "id7307xfq"
Retrieving astrometrically-updated WCS "OPUS-GSC240" for observation "id7307xfq"
Retrieving astrometrically-updated WCS "IDC_2731450pi-GSC240" for observation "id7307xfq"
Retrieving astrometrically-updated WCS "IDC_2731450pi-FIT_REL_GAIADR2" for observation "id7307xfq"
Retrieving astrometrically-updated WCS "id7307xfq_flt_IDC_2731450pi-GSC240-hlet.fits" for observation "id7307xfq"
Retrieving astrometrically-updated WCS "IDC_2731450pi-FIT_SVM_GAIADR2" for observation "id7307xfq"
Updating id7307xfq with:
Replacing primary WCS with
Headerlet with WCSNAME=IDC_2731450pi-FIT_SVM_GAIADR2
['id7307xfq_flc.fits']
The updated solutions should then show up as extra HDRLET extensions
fits.info(filename)
Filename: id7307xfq_flc.fits
No. Name Ver Type Cards Dimensions Format
0 PRIMARY 1 PrimaryHDU 304 ()
1 SCI 1 ImageHDU 207 (4096, 2051) float32
2 ERR 1 ImageHDU 50 (4096, 2051) float32
3 DQ 1 ImageHDU 42 (4096, 2051) int16
4 SCI 2 ImageHDU 205 (4096, 2051) float32
5 ERR 2 ImageHDU 50 (4096, 2051) float32
6 DQ 2 ImageHDU 42 (4096, 2051) int16
7 HDRLET 1 HeaderletHDU 18 ()
8 HDRLET 2 HeaderletHDU 26 ()
9 HDRLET 3 HeaderletHDU 26 ()
10 HDRLET 4 HeaderletHDU 26 ()
11 HDRLET 5 HeaderletHDU 26 ()
12 HDRLET 6 HeaderletHDU 26 ()
13 WCSCORR 1 BinTableHDU 59 14R x 24C [40A, I, A, 24A, 24A, 24A, 24A, D, D, D, D, D, D, D, D, 24A, 24A, D, D, D, D, J, 40A, 128A]
14 HDRLET 7 HeaderletHDU 26 ()
15 HDRLET 8 HeaderletHDU 26 ()
16 WCSDVARR 1 ImageHDU 15 (64, 32) float32
17 WCSDVARR 2 ImageHDU 15 (64, 32) float32
18 D2IMARR 1 ImageHDU 15 (64, 32) float32
19 D2IMARR 2 ImageHDU 15 (64, 32) float32
20 WCSDVARR 3 ImageHDU 15 (64, 32) float32
21 WCSDVARR 4 ImageHDU 15 (64, 32) float32
22 D2IMARR 3 ImageHDU 15 (64, 32) float32
23 D2IMARR 4 ImageHDU 15 (64, 32) float32
As seen above, there are new HDRLET extensions in the fits files (compared to the pre-2019.3 products). These extensions each contain information used to construct a World Coordinate System (WCS), which is used to transform image coordinates into physical (sky) coordinates. Each of these WCS’s represent an astrometric solution derived in a different way.
2. Exploring different solutions#
Each HDRLET extension contains information describing the solution used in its creation. To investigate this we first programmatically obtain the extension numbers of the HDRLETs.
ext_indices = headerlet.find_headerlet_HDUs(filename, strict=False)
# To show it's consistent with the fits.info from above
print(ext_indices)
[7, 8, 9, 10, 11, 12, 14, 15]
We can then loop through these extensions to see what the WCS solutions are.
hdu = fits.open(filename)
print('Ext\tWCSNAME')
for ext_ind in ext_indices:
print(ext_ind, '\t', hdu[ext_ind].header['WCSNAME'])
hdu.close()
Ext WCSNAME
7 OPUS
8 IDC_2731450pi
9 IDC_2731450pi-GSC240
10 IDC_2731450pi-FIT_REL_GAIADR2
11 id7307xfq_flt_IDC_2731450pi-GSC240-hlet.fits
12 IDC_2731450pi-FIT_SVM_GAIADR2
14 IDC_2731450pi
15 IDC_2731450pi-FIT_REL_GAIAeDR3
Alternatively, we can use get_headerlet_kw_names:
new_wcsnames = headerlet.get_headerlet_kw_names(filename, kw='WCSNAME')
new_wcsnames
['OPUS',
'IDC_2731450pi',
'IDC_2731450pi-GSC240',
'IDC_2731450pi-FIT_REL_GAIADR2',
'id7307xfq_flt_IDC_2731450pi-GSC240-hlet.fits',
'IDC_2731450pi-FIT_SVM_GAIADR2',
'IDC_2731450pi',
'IDC_2731450pi-FIT_REL_GAIAeDR3']
We can write this into a convenience function:
def get_hdrlet_wcsnames(filename):
"""Print and return list of WCS names in HDRLET extensions of fits file"""
hdu = fits.open(filename)
ext_indices = headerlet.find_headerlet_HDUs(filename, strict=False)
print('Ext\tWCSNAME')
new_wcsnames = []
for ext_ind in ext_indices:
name = hdu[ext_ind].header['WCSNAME']
print(ext_ind, '\t', name)
new_wcsnames.append(name)
hdu.close()
return new_wcsnames
new_wcsnames = get_hdrlet_wcsnames(filename)
Ext WCSNAME
7 OPUS
8 IDC_2731450pi
9 IDC_2731450pi-GSC240
10 IDC_2731450pi-FIT_REL_GAIADR2
11 id7307xfq_flt_IDC_2731450pi-GSC240-hlet.fits
12 IDC_2731450pi-FIT_SVM_GAIADR2
14 IDC_2731450pi
15 IDC_2731450pi-FIT_REL_GAIAeDR3
We can also see which solution is the “active” solution (the one currently applied to the SCI extensions):
current_wcs = fits.getval(filename, 'WCSNAME', ext=('SCI', 1))
print(current_wcs)
IDC_2731450pi-FIT_SVM_GAIADR2
The nature of each solution is described here: https://drizzlepac.readthedocs.io/en/latest/astrometry.html#interpreting-wcs-names
3. Applying a headerlet to the science extensions#
To apply/activate one of the other solutions, the restore_from_headerlet() function can be used. This function applies the WCS contained in a HDRLET extension to all SCI extensions of the image. Doing this requires knowing which solution should be applied, which can be obtained in multiple ways.
NOTE: This is especially useful in cases where some of the exposures in a visit will have solutions that are aligned to Gaia, but others won't. This is true for grism images in the same visit as direct images, or shallow/deep exposure combinations.
For instance, if the desired solution is IDC_2731450pi-GSC240, we can find the EXTVER of the corresponding HDRLET from the list of wcs names we generated before.
# Gets the index of list element with value 'IDC_2731450pi-GSC240'
# The index in this list + 1 is the same as the EXTVER of the corresponding HDRLET
# We need to add 1 because lists are 0-indexed, while EXTVER's are 1 indexed
chosen_ext = new_wcsnames.index('IDC_2731450pi-GSC240') + 1
headerlet.restore_from_headerlet(filename, hdrext=('HDRLET', chosen_ext), archive=False, force=False)
In this case we set archive keyword argument to False. Setting archive to True will preserve the currently active WCS as a new HDRLET extension on the file. Since in our case the current solution already has a HDRLET, we do not need to archive it. This may be useful in some cases, such as when the image has been manually aligned/transformed, and keeping a record of that solution is desired.
We can check that the solution was applied:
current_wcs = fits.getval(filename, 'WCSNAME', ext=('SCI', 1))
print(current_wcs)
IDC_2731450pi-GSC240
We can also apply the solution via the HDRNAME:
hdrlet_hdrnames = headerlet.get_headerlet_kw_names(fits.open(filename), 'HDRNAME')
desired_hdrname = hdrlet_hdrnames[new_wcsnames.index('IDC_2731450pi-GSC240')]
print(desired_hdrname)
id7307xfq_flt_IDC_2731450pi-GSC240
headerlet.restore_from_headerlet(filename, hdrname=desired_hdrname, archive=False, force=False)
We can also apply some logic to get the hdrext programatically. For instance, if we only wanted the IDC (distortion calibrated) solution with the GSC240 tag (indicating that the guide star positions had been updated), we can do the following:
for i, wcsname in enumerate(new_wcsnames):
if 'IDC' in wcsname and 'GSC240' in wcsname:
chosen_ext = i + 1 # Add one due to 0 indexing of enumerate vs 1 indexing of EXTVER
break
print('The desired extension is:', ('HDRLET', chosen_ext))
The desired extension is: ('HDRLET', 3)
Finding the solution this way can be easier, as it doesn’t require a full typing out of the IDCTAB name. However, in the future, if new IDCTABs are created, there may be multiple solutions matching the criteria above, and more sophisticated logic will need to be applied.
4. Restoring the “old” solution#
If the original solution is desired, it can be restored using the methods shown above, by replacing the WCSNAME simply with IDC_2731450pi, or whatever the name of the IDCTAB for that file is. To get that name, the following procedure can be done:
NOTE: Data taken after October 2017 may not have a solution of the form IDC_xxxxxxxxx, as the pointing information of the telescope was already calculated using GSC 2.4.0. As such, the "old" solution may be of the same form as the a priori solution, i.e.: IDC_xxxxxxxxx-GSC240.
idc_file = fits.getval(filename, 'IDCTAB')
idc_filename = idc_file.split('$')[-1]
idc_wcsname = 'IDC_' + idc_filename.replace('_idc.fits', '')
print(idc_wcsname)
IDC_2731450pi
Restoring the solution is then done the same as above:
chosen_ext = new_wcsnames.index(idc_wcsname) + 1
headerlet.restore_from_headerlet(filename, hdrext=('HDRLET', chosen_ext), archive=False, force=False)
current_wcs = fits.getval(filename, 'WCSNAME', ext=('SCI', 1))
print(current_wcs)
IDC_2731450pi
Alternatively, updatewcs can be run on the image, with the use_db flag set to False:
updatewcs.updatewcs(filename, use_db=False)
Deleted all instances of WCS with key A in extensions [1, 4]
Wcskey 'O' is reserved for the original WCS and should not be deleted.
INFO:
Inconsistent SIP distortion information is present in the FITS header and the WCS object:
SIP coefficients were detected, but CTYPE is missing a "-SIP" suffix.
astropy.wcs is using the SIP distortion coefficients,
therefore the coordinates calculated here might be incorrect.
If you do not want to apply the SIP distortion coefficients,
please remove the SIP coefficients from the FITS header or the
WCS object. As an example, if the image is already distortion-corrected
(e.g., drizzled) then distortion components should not apply and the SIP
coefficients should be removed.
While the SIP distortion coefficients are being applied here, if that was indeed the intent,
for consistency please append "-SIP" to the CTYPE in the FITS header or the WCS object.
[astropy.wcs.wcs]
- IDCTAB: Distortion model from row 36 for chip 2 : F814W
INFO:
Inconsistent SIP distortion information is present in the FITS header and the WCS object:
SIP coefficients were detected, but CTYPE is missing a "-SIP" suffix.
astropy.wcs is using the SIP distortion coefficients,
therefore the coordinates calculated here might be incorrect.
If you do not want to apply the SIP distortion coefficients,
please remove the SIP coefficients from the FITS header or the
WCS object. As an example, if the image is already distortion-corrected
(e.g., drizzled) then distortion components should not apply and the SIP
coefficients should be removed.
While the SIP distortion coefficients are being applied here, if that was indeed the intent,
for consistency please append "-SIP" to the CTYPE in the FITS header or the WCS object.
[astropy.wcs.wcs]
- IDCTAB: Distortion model from row 36 for chip 2 : F814W
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[2]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[3]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[5]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[6]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[7]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[8]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[9]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[10]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[11]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[12]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[13]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[14]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[15]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[16]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[17]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[18]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[19]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[20]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[21]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[22]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
WARNING: wcs_from_key: Could not read WCS with key A [stwcs.wcsutil.altwcs]
WARNING: Skipping file 'id7307xfq_flc.fits[23]' [stwcs.wcsutil.altwcs]
WARNING: No WCS with key 'A' was found in the given header [stwcs.wcsutil.altwcs]
INFO:
Inconsistent SIP distortion information is present in the FITS header and the WCS object:
SIP coefficients were detected, but CTYPE is missing a "-SIP" suffix.
astropy.wcs is using the SIP distortion coefficients,
therefore the coordinates calculated here might be incorrect.
If you do not want to apply the SIP distortion coefficients,
please remove the SIP coefficients from the FITS header or the
WCS object. As an example, if the image is already distortion-corrected
(e.g., drizzled) then distortion components should not apply and the SIP
coefficients should be removed.
While the SIP distortion coefficients are being applied here, if that was indeed the intent,
for consistency please append "-SIP" to the CTYPE in the FITS header or the WCS object.
[astropy.wcs.wcs]
- IDCTAB: Distortion model from row 35 for chip 1 : F814W
['id7307xfq_flc.fits']
current_wcs = fits.getval(filename, 'WCSNAME', ext=('SCI', 1))
print(current_wcs)
IDC_2731450pi
5. Inspecting alignment (optional)#
While the solutions should improve the astrometry of the images, they may not have perfect absolute astrometry. To check the quality of the absolute astrometry. To do this, we can overplot the positions of the Gaia sources on the images. If the absolute astrometry is correct, the Gaia positions will project on top of the sources in the images. The WCS solutions that contain ‘FIT-GAIA’ in the WCSNAME should have the closest alignment, while the GSC-240 and baseline IDC solution will likely have small offsets.
We first need to get a listing of the Gaia sources:
ast_tbl = generate_astrometric_catalog('id7307xfq_flc.fits', output=True)
ast_tbl
Table length=2230
| RA | DEC | mag | objID |
|---|---|---|---|
| float64 | float64 | float64 | int64 |
| 80.5730899119131 | -67.9474991750782 | -- | 4658741306468400256 |
| 80.5439170969378 | -67.9438011573397 | -- | 4658741370926206336 |
| 80.5924054598397 | -67.9544180247475 | -- | 4658741306468435328 |
| 80.5214509397304 | -67.9429440875399 | -- | 4658741581346201600 |
| 80.5087676329488 | -67.9648937699992 | 21.59373 | 4658741169049735680 |
| 80.5396243528847 | -67.9352493940572 | 21.54121 | 4658741478269158016 |
| 80.5510482118061 | -67.9703065150295 | 21.41451 | 4658740962871024768 |
| 80.6007478478036 | -67.9510988199131 | 21.33524 | 4658741405311718400 |
| 80.5812549526072 | -67.9517424214045 | 21.24463 | 4658741302232469248 |
| 80.5353526051586 | -67.9573805752007 | 21.2377 | 4658741340848432768 |
| ... | ... | ... | ... |
| 80.585738596849 | -67.9467417927248 | 13.89922 | 4658741409567587072 |
| 80.5264460461267 | -67.9511038446995 | 13.81326 | 4658741340848070272 |
| 80.4472721687584 | -67.9279971503336 | 13.50986 | 4658741615725905024 |
| 80.5312351802869 | -67.9460273546763 | 13.48465 | 4658741370889602688 |
| 80.5742154420049 | -67.9525690542069 | 13.29313 | 4658741306488369408 |
| 80.5778068165484 | -67.9555364337101 | 13.1766 | 4658741306488372736 |
| 80.4911693176135 | -67.9404338632035 | 13.06015 | 4658741547006462976 |
| 80.5158350687302 | -67.9246814089449 | 12.71375 | 4658741684445420032 |
| 80.5718868285313 | -67.9491625283722 | 12.01282 | 4658741370886084992 |
| 80.4448429583895 | -67.9451155835052 | 11.77774 | 4658741233447131136 |
We then need the WCS of the images, to project the Gaia positions onto the image coordinate frame.
hdu = fits.open(filename)
w = WCS(hdu['SCI', 1].header, hdu)
data = hdu['SCI', 1].data
x, y = w.all_world2pix(np.array([ast_tbl['RA'], ast_tbl['DEC']]).T, 0).T
fig = plt.figure(figsize=(10, 5))
ax = plt.subplot(projection=w) # matplotlib has support for axes using WCS projections!
ax.imshow(data, origin='lower',
norm=ImageNormalize(data, interval=PercentileInterval(99.65), stretch=LogStretch()))
ax.coords.grid(True, color='white', ls=':', alpha=.6)
ax.autoscale(False)
ax.scatter(x, y, edgecolors='r', facecolor=None, alpha=.8)
<matplotlib.collections.PathCollection at 0x7ff53e410810>
The original (only IDC tab) WCS will likely have an offset between the Gaia positions and the sources. The GSC-240 solution offset is generally smaller, while any of the GAIA-FIT solutions should be well under a pixel. Using the code in section 3, the offsets can be seen for each available WCS.
6. Changing the WCS of drizzled images#
Because the drizzling process is directly affected by the WCS’s of the input images, the WCS of the drizzled image cannot be changed as simply as shown above for FLC images. To use an astrometric solution (other than the one applied to the FLT/FLC at the time of drizzling), the images will have to be re-drizzled after activating the desired WCS in the FLT/FLC images.
NOTE: The images input to astrodrizzle should use the same WCS solution, or the drizzling process will produce poor results.
In order to get the same name for the drizzled file, we can simply run astrodrizzle on the association (asn) file we downloaded before.
astrodrizzle.AstroDrizzle('id7307030_asn.fits', mdriztab=True, build=True, clean=True, preserve=False)
Setting up logfile : astrodrizzle.log
AstroDrizzle log file: astrodrizzle.log
AstroDrizzle Version 3.5.1 started at: 16:53:39.346 (19/04/2024)
==== Processing Step Initialization started at 16:53:39.34 (19/04/2024)
Reading in MDRIZTAB parameters for 4 files
- MDRIZTAB: AstroDrizzle parameters read from row 3.
WCS Keywords
Number of WCS axes: 2
CTYPE : 'RA---TAN' 'DEC--TAN'
CRVAL : 80.52478377106357 -67.94279218580297
CRPIX : 2076.5 2237.5
CD1_1 CD1_2 : 1.0380442337376844e-05 3.656319909454076e-06
CD2_1 CD2_2 : 3.656319909454076e-06 -1.0380442337376844e-05
NAXIS : 4153 4475
********************************************************************************
*
* Estimated memory usage: up to 1107 Mb.
* Output image size: 4153 X 4475 pixels.
* Output image file: ~ 212 Mb.
* Cores available: 4
*
********************************************************************************
==== Processing Step Initialization finished at 16:53:40.572 (19/04/2024)
==== Processing Step Static Mask started at 16:53:40.575 (19/04/2024)
==== Processing Step Static Mask finished at 16:53:41.575 (19/04/2024)
==== Processing Step Subtract Sky started at 16:53:41.576 (19/04/2024)
***** skymatch started on 2024-04-19 16:53:41.813791
Version 1.0.9
'skymatch' task will apply computed sky differences to input image file(s).
NOTE: Computed sky values WILL NOT be subtracted from image data ('subtractsky'=False).
'MDRIZSKY' header keyword will represent sky value *computed* from data.
----- User specified keywords: -----
Sky Value Keyword: 'MDRIZSKY'
Data Units Keyword: 'BUNIT'
----- Input file list: -----
** Input image: 'id7307xfq_flc.fits'
EXT: 'SCI',1; MASK: id7307xfq_skymatch_mask_sci1.fits[0]
EXT: 'SCI',2; MASK: id7307xfq_skymatch_mask_sci2.fits[0]
** Input image: 'id7307xhq_flc.fits'
EXT: 'SCI',1; MASK: id7307xhq_skymatch_mask_sci1.fits[0]
EXT: 'SCI',2; MASK: id7307xhq_skymatch_mask_sci2.fits[0]
** Input image: 'id7307xlq_flc.fits'
EXT: 'SCI',1; MASK: id7307xlq_skymatch_mask_sci1.fits[0]
EXT: 'SCI',2; MASK: id7307xlq_skymatch_mask_sci2.fits[0]
** Input image: 'id7307xpq_flc.fits'
EXT: 'SCI',1; MASK: id7307xpq_skymatch_mask_sci1.fits[0]
EXT: 'SCI',2; MASK: id7307xpq_skymatch_mask_sci2.fits[0]
----- Sky statistics parameters: -----
statistics function: 'median'
lower = -100.0
upper = None
nclip = 5
lsigma = 4.0
usigma = 4.0
binwidth = 0.10000000149011612
----- Data->Brightness conversion parameters for input files: -----
* Image: id7307xfq_flc.fits
EXT = 'SCI',1
Data units type: COUNTS
EXPTIME: 697.0 [s]
Conversion factor (data->brightness): 0.9139832998392358
EXT = 'SCI',2
Data units type: COUNTS
EXPTIME: 697.0 [s]
Conversion factor (data->brightness): 0.9139832998392358
* Image: id7307xhq_flc.fits
EXT = 'SCI',1
Data units type: COUNTS
EXPTIME: 697.0 [s]
Conversion factor (data->brightness): 0.9139832998392358
EXT = 'SCI',2
Data units type: COUNTS
EXPTIME: 697.0 [s]
Conversion factor (data->brightness): 0.9139832998392358
* Image: id7307xlq_flc.fits
EXT = 'SCI',1
Data units type: COUNTS
EXPTIME: 697.0 [s]
Conversion factor (data->brightness): 0.9139832998392358
EXT = 'SCI',2
Data units type: COUNTS
EXPTIME: 697.0 [s]
Conversion factor (data->brightness): 0.9139832998392358
* Image: id7307xpq_flc.fits
EXT = 'SCI',1
Data units type: COUNTS
EXPTIME: 441.0 [s]
Conversion factor (data->brightness): 1.4445495691336674
EXT = 'SCI',2
Data units type: COUNTS
EXPTIME: 441.0 [s]
Conversion factor (data->brightness): 1.4445495691336674
----- Computing sky values requested image extensions (detector chips): -----
* Image: 'id7307xfq_flc.fits['SCI',1,2]' -- SKY = 33.16146072933555 (brightness units)
Sky change (data units):
- EXT = 'SCI',1 delta(MDRIZSKY) = 36.2823 NEW MDRIZSKY = 36.2823
- EXT = 'SCI',2 delta(MDRIZSKY) = 36.2823 NEW MDRIZSKY = 36.2823
* Image: 'id7307xhq_flc.fits['SCI',1,2]' -- SKY = 23.675934355626346 (brightness units)
Sky change (data units):
- EXT = 'SCI',1 delta(MDRIZSKY) = 25.9041 NEW MDRIZSKY = 25.9041
- EXT = 'SCI',2 delta(MDRIZSKY) = 25.9041 NEW MDRIZSKY = 25.9041
* Image: 'id7307xlq_flc.fits['SCI',1,2]' -- SKY = 23.78707573459735 (brightness units)
Sky change (data units):
- EXT = 'SCI',1 delta(MDRIZSKY) = 26.0257 NEW MDRIZSKY = 26.0257
- EXT = 'SCI',2 delta(MDRIZSKY) = 26.0257 NEW MDRIZSKY = 26.0257
* Image: 'id7307xpq_flc.fits['SCI',1,2]' -- SKY = 24.23146985119446 (brightness units)
Sky change (data units):
- EXT = 'SCI',1 delta(MDRIZSKY) = 16.7744 NEW MDRIZSKY = 16.7744
- EXT = 'SCI',2 delta(MDRIZSKY) = 16.7744 NEW MDRIZSKY = 16.7744
***** skymatch ended on 2024-04-19 16:53:44.002033
TOTAL RUN TIME: 0:00:02.188242
==== Processing Step Subtract Sky finished at 16:53:44.24 (19/04/2024)
==== Processing Step Separate Drizzle started at 16:53:44.24 (19/04/2024)
WCS Keywords
Number of WCS axes: 2
CTYPE : 'RA---TAN' 'DEC--TAN'
CRVAL : 80.52478377106357 -67.94279218580297
CRPIX : 2076.5 2237.5
CD1_1 CD1_2 : 1.0380442337376844e-05 3.656319909454076e-06
CD2_1 CD2_2 : 3.656319909454076e-06 -1.0380442337376844e-05
NAXIS : 4153 4475
-Generating simple FITS output: id7307xfq_single_sci.fits
-Generating simple FITS output: id7307xhq_single_sci.fits
-Generating simple FITS output: id7307xlq_single_sci.fits
-Generating simple FITS output: id7307xpq_single_sci.fits
Writing out image to disk: id7307xfq_single_sci.fits
Writing out image to disk: id7307xhq_single_sci.fits
Writing out image to disk: id7307xlq_single_sci.fits
Writing out image to disk: id7307xpq_single_sci.fits
Writing out image to disk: id7307xfq_single_wht.fits
Writing out image to disk: id7307xhq_single_wht.fits
Writing out image to disk: id7307xpq_single_wht.fits
Writing out image to disk: id7307xlq_single_wht.fits
==== Processing Step Separate Drizzle finished at 16:53:46.61 (19/04/2024)
==== Processing Step Create Median started at 16:53:46.613 (19/04/2024)
reference sky value for image 'id7307xfq_flc.fits' is 36.2823486328125
reference sky value for image 'id7307xhq_flc.fits' is 25.90412139892578
reference sky value for image 'id7307xlq_flc.fits' is 26.02572250366211
reference sky value for image 'id7307xpq_flc.fits' is 16.774412155151367
Saving output median image to: 'id7307030_med.fits'
==== Processing Step Create Median finished at 16:53:48.95 (19/04/2024)
==== Processing Step Blot started at 16:53:48.956 (19/04/2024)
Blot: creating blotted image: id7307xfq_flc.fits[sci,1]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xfq_sci1_blt.fits
Writing out image to disk: id7307xfq_sci1_blt.fits
Blot: creating blotted image: id7307xfq_flc.fits[sci,2]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xfq_sci2_blt.fits
Writing out image to disk: id7307xfq_sci2_blt.fits
Blot: creating blotted image: id7307xhq_flc.fits[sci,1]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xhq_sci1_blt.fits
Writing out image to disk: id7307xhq_sci1_blt.fits
Blot: creating blotted image: id7307xhq_flc.fits[sci,2]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xhq_sci2_blt.fits
Writing out image to disk: id7307xhq_sci2_blt.fits
Blot: creating blotted image: id7307xlq_flc.fits[sci,1]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xlq_sci1_blt.fits
Writing out image to disk: id7307xlq_sci1_blt.fits
Blot: creating blotted image: id7307xlq_flc.fits[sci,2]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xlq_sci2_blt.fits
Writing out image to disk: id7307xlq_sci2_blt.fits
Blot: creating blotted image: id7307xpq_flc.fits[sci,1]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xpq_sci1_blt.fits
Writing out image to disk: id7307xpq_sci1_blt.fits
Blot: creating blotted image: id7307xpq_flc.fits[sci,2]
Using default C-based coordinate transformation...
-Generating simple FITS output: id7307xpq_sci2_blt.fits
Writing out image to disk: id7307xpq_sci2_blt.fits
==== Processing Step Blot finished at 16:53:58.068 (19/04/2024)
==== Processing Step Driz_CR started at 16:53:58.070 (19/04/2024)
Creating output: id7307xfq_sci1_crmask.fits
Creating output: id7307xhq_sci1_crmask.fits
Creating output: id7307xlq_sci1_crmask.fits
Creating output: id7307xpq_sci1_crmask.fits
Creating output: id7307xfq_sci2_crmask.fits
Creating output: id7307xhq_sci2_crmask.fits
Creating output: id7307xlq_sci2_crmask.fits
Creating output: id7307xpq_sci2_crmask.fits
==== Processing Step Driz_CR finished at 16:54:01.462 (19/04/2024)
==== Processing Step Final Drizzle started at 16:54:01.474 (19/04/2024)
WCS Keywords
Number of WCS axes: 2
CTYPE : 'RA---TAN' 'DEC--TAN'
CRVAL : 80.52478377106357 -67.94279218580297
CRPIX : 2076.5 2237.5
CD1_1 CD1_2 : 1.0380442337376844e-05 3.656319909454076e-06
CD2_1 CD2_2 : 3.656319909454076e-06 -1.0380442337376844e-05
NAXIS : 4153 4475
-Generating multi-extension output file: id7307030_drc.fits
Writing out to disk: id7307030_drc.fits
==== Processing Step Final Drizzle finished at 16:54:16.555 (19/04/2024)
AstroDrizzle Version 3.5.1 is finished processing at 16:54:16.556 (19/04/2024).
-------------------- --------------------
Step Elapsed time
-------------------- --------------------
Initialization 1.2245 sec.
Static Mask 1.0001 sec.
Subtract Sky 2.6702 sec.
Separate Drizzle 2.3646 sec.
Create Median 2.3417 sec.
Blot 9.1122 sec.
Driz_CR 3.3920 sec.
Final Drizzle 15.0805 sec.
==================== ====================
Total 37.1858 sec.
Trailer file written to: astrodrizzle.log
About this Notebook#
Updated: June 12, 2023 by A. O'Connor -- STScI WFC3