Drizzle?

[Philip Bergen]

Hi,

What a great package astrometry is! I'm able to solve all my horrible astrophotos!

Here's my plan:

1. Solve my pictures

2. Combine them using astrodrizzle

3. World domination

I'm stuck on "2.". Astrodrizzle seems to require a number of headers in the fits files that I don't have (instrume, detector, obstype so far).

Has anyone here had any luck using the solve-info to automatically combine images?

(Suggestions other than drizzle are welcome, but I'm looking for something that's command line or python.)

Thanks,

// Phil

[David W Hogg]

Can you just put dummies in for those keywords, or does it need to come from some dictionary of possibilities?

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[Dustin Lang]

There is a command-line program in the Astrometry.net package called wcs-resample .  Say you have two images, A.fits and B.fits, with A.wcs and B.wcs.

'''
wcs-resample -w B.wcs B.fits A.wcs B-like-A.fits
'''

will produce a file "B-like-A.fits" with B's pixels resampled onto A's pixel grid.  It is dumb -- I think it does nearest-neighbour resampling -- but it's a start.

As for adding them together, you could try the "imarith" program (also built with the Astrometry.net tools).

cheers,
dustin

[David W Hogg]

A little bit of cubic spline magic and it would be money in the bank.

[Dustin Lang]

There is some Lanczos resampling code floating around there, but it's not glued in to the wcs-resample program yet.

[Philip Bergen]

Aloha David,

There is a predefined set. I tried putting some fake values but that didn't work. So I wanted to see

if perhaps someone here had already figured this out.

Thanks,

// Phil