Document whether `astrometric_precision` is total or per-coordinate - Githubissues

lsst-sims / legacy_sims_maf

LSST Simulations package for the metrics analysis framework (MAF)

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Document whether `astrometric_precision` is total or per-coordinate #190

Open mjuric opened 4 years ago

mjuric commented 4 years ago

The astrom_precision function allows one to compute the random component of the astrometric error given seeing FWHM and the object's SNR.

It would be good to better document its inputs and outputs:

The FWHM is the seeing, but there are multiple definitions of seeing (geometric and effective) -- which one should be used here?
Is the output the predicted precision per coordinate, or total?
It would be good to cite where this comes from.