Downloading image cutouts instead of the full image

[JTerwel]

Usually I only need to see a small region around my object of interest. Downloading the entire image is not needed. IRSA allows one to query for a cutout, as is show near the bottom of this page.

Can an option be added to ztfquery where I can ask to only download the image cutouts? This would speed up my code considerably.

[simeonreusch]

Jacco, this is brilliant.

[MickaelRigault]

Thanks for pushing this @simeonreusch I beleive it should not be that complicated to add to the url builder

[simeonreusch]

Already on it. Modifying the url is trivial. What's harder is making ztfquery respect a different parent directory (if you don't do that, running forced photometry on a source in the same field will fail, as it won't be part of the cutout).

[MickaelRigault]

Do you want the cutout service to store data ?

[simeonreusch]

Of course I do. But no worries, I'm almost done

[MickaelRigault]

Any progress on that @simeonreusch ?

[simeonreusch]

Yes, it's implemented. The keyword is cutouts=True (you also need to specify radec). If one does this, one should also specify download_dir to avoid not finding objects observed with the same CCD which won't be in the cutouts.