FindOverlaps

Calculate a which images obtained with a filter overlap

Space Telescope Science Institute

Synopsis

Calculate a which images obtained with a filter overlap with which others

usage: FindOverlaps.py [-all] Field Tile1  Tile2 .....

where -all implies that the ovelaps for all of the
tiles in afiled will be dound

Find the images that ovelap that have the same

filter.

The routine calculates overlaps of the same filter, regardless of the exposure times.

The overlaps are found based on the RA, DEC corrners of the immages.

The routine outputs a single file that indicates which images overlap subject to thise conditions

The routine DOES NOT calculate fluxes in the overlap regions, just that the ovelaps exist

do_one_tile

It is important to recognize that care has

been taken to avoid double listing, that is to say in separate lines of the output file that

file_a matches file_b file_b matches file_a

There is no significance to the order of file_a and file_b.

This routine depends on having run either SetupTile or SetupSpecial, but does not require SwarpSetup, or Swarp.

230524 ksl

Coding begun

250128 ksl

Modified the code so that both exposure times are recorded. Choosing

what exposure times to match background to occurs later.

`do_one_filter`([field, tile, xfilter])	Find the overlaps for one filter in one tile
`do_one_tile`([field, tile])	Find the overlaps for all of the filters in one tile
`get_files`(field, tile[, xfilter])	Idenfify all of the files associated
`get_overlap`(row, xxtab)	Get all of the images which have the
`steer`(argv)	This is just a steering routine for running swarp on one or more

FindOverlaps.do_one_filter(field='LMC_c45', tile='T07', xfilter='Ha'): Find the overlaps for one filter in one tile

FindOverlaps.do_one_tile(field='LMC_c45', tile='T07'): Find the overlaps for all of the filters in one tile

FindOverlaps.get_files(field, tile, xfilter='Ha')

Idenfify all of the files associated with a specific filter in a tile

Note: This reads the Field_Tile.txt files in the Summary directory

FindOverlaps.get_overlap(row, xxtab)

Get all of the images which have the same exposure time as the given row and also overlap with a given row in the table

Note eliminating images that have different exposure times implies that we do not intend to match backgrounds from images that have differnt times

FindOverlaps.steer(argv): This is just a steering routine for running swarp on one or more tiles from the command line