update psf-quicksim

[alxogm]

@julienguy @sbailey I have noticed that in order to match the wavelength output from specsim simulations I need to provide an updated file of $DESIMODEL/data/specpsf/psf-quicksim.fits, is there a script to produce this file?

I think the update needed is to provide a finer wavelength grid and a shorter wavelength range.

The alternative I think is to hack specsim, but David advised not to do that.

[sbailey]

@alxogm the original code to convert the optical model spots PSFs into the quicksim PSFs is in $DESIMODEL/bin/psf2quicksim.py. I think you'd need to change line 139 to use the wavelength grids from the real data (per-camera) and I expect the rest would still work.

[alxogm]

Thanks! I'll take a look .

[alxogm]

It worked using desi_enviroment 20.4, with more recent ones throws the following error:

File "psf2quicksim.py", line 144, in <module>
   data = quicksim_input_data(psffile, ww)
 File "psf2quicksim.py", line 52, in quicksim_input_data
   hdr = fitsio.read_header(psffile)
 File "/global/common/software/desi/cori/desiconda/20200801-1.4.0-spec/conda/lib/python3.8/site-packages/fitsio/fitslib.py", line 229, in read_header
   return FITSHDR(_fits.read_header(hdunum))
OSError: FITSIO status = 412: datatype conversion overflow
Error in ffc2dd converting string to double: 4.77449053078351E-312
Error in ffc2d evaluating string as a double: 4.77449053078351E-312

I didn't tried to solve it as I could generate the file I needed with the older desi_enviroment.

I have one question: 1) should I commit the new file I generated to svn, perhaps with a different name so that the original can still be used?