Table of Contents
dmextract requires a "sky" vector to bin on x and y
If the x and y columns are not associated as a "sky" vector, dmextract can't bin on them:
unix% dmextract infile="img.fits[bin (X,Y)=@ann.reg]" ... # dmextract (CIAO): dsDMEXTRACTREGWCSWERR -- WARNING: Expected 2 dimensions for the sky descriptor. Skipping translation of region to WCS. or # dmextract (CIAO): dsFINDCOLUMNERR -- ERROR: Column 'sky' was not found in file 'HDU2'.
Edit the file header to create a sky vector.
unix% cat dmhedit.lis #add MTYPE1 = POS MFORM1 = X,Y unix% punlearn dmhedit unix% dmhedit img.fits dmhedit.lis
Problem with pgrid() stack syntax
There is a problem using the pgrid() stack syntax when making radial profiles.
unix% dmextract "image.fits[sky=pgrid(4096,4096,0:1000:100,30:60:30)]" sector.fits opt=generic
While the tool runs to completion, the output is not always correct.
Binning on celestial coordinates
Trying to bin on celestial coordinates can yield incorrect results
% dmextract "events.fits[bin cel=circle(150.57256,2.4995918,0.09')]" outfile=/tmp/test.fits op=generic
which may produce an incorrect radius column.
Users should only bin in physical or logical coodinates.