Skip to content

Include WCS header in submap #47

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
jernestmyers wants to merge 1 commit into
base: main
Choose a base branch
from
Open

Include WCS header in submap #47

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
30 changes: 26 additions & 4 deletions tilemaker/processing/extractor.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ def extract(
metadata: DataConfiguration,
grants: set[str],
show_grid: bool = False,
) -> tuple[np.array, list[PushableTile]]:
) -> tuple[np.array, list[PushableTile], WCS]:
"""
Extract a sub-map from a band between RA and Dec ranges (in degrees).

Expand Down Expand Up @@ -84,11 +84,11 @@ def extract(
wcs = WCS(
{
"NAXIS": 2,
"NAXIS1": NAXIS1,
"NAXIS2": NAXIS2,
"CRPIX1": NAXIS1 * 0.5,
"CRPIX2": NAXIS2 * 0.5 + 0.5,
"CRVAL1": 0.0,
"NAXIS1": NAXIS1,
"NAXIS2": NAXIS2,
"CRVAL2": 0.0,
"CDELT1": CDELT_RA,
"CDELT2": -CDELT_DEC,
Expand Down Expand Up @@ -197,4 +197,26 @@ def extract(

log = log.info("extractor.complete")

return buffer, pushables
# Create WCS for submap; note that only CRPIX and NAXIS change
submap_wcs = WCS(
{
"NAXIS": 2,
"NAXIS1": x_size,
"NAXIS2": y_size,
"CRPIX1": wcs.wcs.crpix[0] - left_pix,
"CRPIX2": wcs.wcs.crpix[1] - bottom_pix,
"CRVAL1": wcs.wcs.crval[0],
"CRVAL2": wcs.wcs.crval[1],
"CDELT1": wcs.wcs.cdelt[0],
"CDELT2": wcs.wcs.cdelt[1],
"CTYPE1": "RA---CAR",
"CTYPE2": "DEC--CAR",
"CUNIT1": "deg",
"CUNIT2": "deg",
"LONPOLE": 90.0,
"LATPOLE": 0.0,
"RADESYS": "ICRS",
}
)

return buffer, pushables, submap_wcs
5 changes: 3 additions & 2 deletions tilemaker/server/layers.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,7 @@ def get_submap(
Get a submap of the specified band.
"""

submap, pushables = extract(
submap, pushables, wcs = extract(
layer_id=layer_id,
left=left,
right=right,
Expand Down Expand Up @@ -186,7 +186,8 @@ def get_submap(
return Response(content=output.getvalue(), media_type="image/png")
elif ext == "fits":
with io.BytesIO() as output:
hdu = fits.PrimaryHDU(submap)
header = wcs.to_header()
hdu = fits.PrimaryHDU(submap, header=header)
hdu.writeto(output)
return Response(content=output.getvalue(), media_type="image/fits")

Expand Down
Loading