descDithers

[humnaawan]

The idea is to allow access to descDithers (translational and rotational dithers; replace
fieldRA, fieldDec, rotTelPos), similar to those implemented in DC1/DC2. For MAF users, this would translate to instructions to the right Stackers, while for non-MAF users, csv files with descDithers will be produced.

[rbiswas4]

@humnaawan Having the code here is great! Are the csv files obtained as a result of this available (say on nersc)?

[humnaawan]

@rbiswas4 yes, see here for details, including the path to the directory with the csv files.

[rbiswas4]

@humnaawan Thanks. But I don't seem to have read permissions for either the databases or the csv files. Perhaps these could be put in a common area. I believe @heather999 has a DESC area we can use for such purposes, but I don't recall the location off the top of my head ... can check later today.

[humnaawan]

Just for documentation purposes, I'll note that the initial work was done in the descDithers branch and led to PR #2 and #4. I then deleted the branch, replacing it with issue/3/desc-dithers, which follows the branching-naming convention we've decided upon to keep the branchs tied with specific Issues.

[humnaawan]

Based on the conversations at the Project & Community Workshop 2018, baseline2018a is the project-official baseline, not kraken2026.

Keeping that in mind, I've put baseline2018a.db in /global/cscratch1/sd/awan/dbs_wp_unzipped and updated the readme (fee60f3). Then, I produced the csv file for the database (see below and 87e4d5a for details). @rbiswas4 please let me know if there are any problems.

---

To produce the dithers for only the one database, I changed the descDiths_wp_cadences.py file by using:

save_csv_dithers(dbs_path, outDir, db_files_only='baseline2018a.db', rot_rand_seed=42, trans_rand_seed=42,  print_progress=False, show_diagnostic_plots=False, save_plots=True)

but am not committing the changes since its a one-time thing only.

[rbiswas4]

@humnaawan 🥇

[humnaawan]

Update: the latest commits have implemented the less frequent translational dithering and file compression. The zipped files are now available in the same directory as before: /global/homes/a/awan/desc/wp_descDithers_csvs

@rbiswas4 @nregnault please let me know if there are any problems.

[rbiswas4]

@humnaawan 🥇 Trying them out tonight!