Zero point and pixel scale

[connors...@gmail.com]

Hello,

I have been retrieving some images from DESI DR8 following the instructions here: http://legacysurvey.org/dr8/description/#obtaining-images-and-raw-data

Could you please tell me what the photometric zero point is for the grz images? I believe it is somewhere around -2, based on visual inspection, but I would like to have the exact value that the images are calibrated to.

I would also just like to confirm the "pixscale" setting in the wget commands. Has that feature been implemented yet, or will it come later?

Thanks,

Connor

[Dustin Lang]

Hi,

Yes, pixscale works.

At pixscale=0.262 (the pixel scale we used for our coadds), the zeropoint is 22.5; ie, the images are in "nanomaggies".

At other pixscales, I am not certain!  There is enough binning, smoothing, and resampling that I would have to check empirically.

cheers,

--dustin

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