TABLE ObjMask

Contains a record describing each ObjMask/Atlas object

The table contains the outlines of each object over a 4x4 pixel grid, and the bounding rectangle of the object within the frame.

name type length unit ucd description

objID bigint 8 ID_MAIN Unique Id number, composed of rerun, run, camcol, field, objid

size int 4 NUMBER number of spans allocated

nspan int 4 NUMBER actual number of spans

row0 int 4 POS_OFFSET row offset from parent region

col0 int 4 POS_OFFSET col offset from parent region

rmin int 4 pix POS_LIMIT bounding box min row

rmax int 4 pix POS_LIMIT bounding box max row

cmin int 4 pix POS_LIMIT bounding box min col

cmax int 4 pix POS_LIMIT bounding box max col

npix int 4 pix EXTENSION_AREA number of pixels in object

span text 16 POS_MAP span data as string

name	type	length	unit	ucd	description
objID	bigint	8		ID_MAIN	Unique Id number, composed of rerun, run, camcol, field, objid
size	int	4		NUMBER	number of spans allocated
nspan	int	4		NUMBER	actual number of spans
row0	int	4		POS_OFFSET	row offset from parent region
col0	int	4		POS_OFFSET	col offset from parent region
rmin	int	4	pix	POS_LIMIT	bounding box min row
rmax	int	4	pix	POS_LIMIT	bounding box max row
cmin	int	4	pix	POS_LIMIT	bounding box min col
cmax	int	4	pix	POS_LIMIT	bounding box max col
npix	int	4	pix	EXTENSION_AREA	number of pixels in object
span	text	16		POS_MAP	span data as string