Command-line scripts

create_data directory

create_data followed by a directory will process the proposal file (generally a 5-digit string followed by ‘.prop’) in that directory. The proposal file contains the names of the FITS files to be processed and the relationship between the exposures, allowing a unique numbering scheme.

Each FITS file referred to in the exposure will be processed to make a Level1b format JWST dataset with the pixel data flipped and/or rotated to make it conform to the DMS coordinate system, in which all imaging data has roughly the same orientation and parity on the sky.

The 5-digit string is used in the name of the Level 1b product, in that file 12345.prop will make data of the form

jw12345aaabbb_cccdd_eeeee_DATATYPE_uncal.fits.

The numbers that fill in the other letter spaces come from the structure of the proposal file, which is a sequence of nested levels. As each level is repeated, the number assigned to represent that level increments by 1.