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desihub / desimeter

DESI coordinates and transformations
BSD 3-Clause "New" or "Revised" License
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Compare desimeter and platemaker #129

Open julienguy opened 3 years ago

julienguy commented 3 years ago

Compute field model on many exposures, predict fiber position on focal plane and compare with platemaker coordinates? files. First goal is to fit shift, rotation, dilatation and correlate differences with ADC angles , parallactic angle and zenith angle ...

julienguy commented 3 years ago

Evidence for some systematic rotation dilatation shifts in the comparison of the desimeter derived RA Dec and the target RA Dec. See https://desi.lbl.gov/trac/tracmailman/browser/private/desi-commiss/2020-October/005129.html which give links to

This analysis will be repeated once the fiducials coordinates have been adjusted.