|AHELP for CIAO 4.2||
Convert from the Tiled Detector (TDET) to Chip coordinate system.
( Integer_Type chip_id, Array_Type pos ) = pix_tdet_to_chip( Double_Type x, Double_Type y )
This routine converts a position in the Tiled Detector (TDET) coordinate system to the matching position in the Chip coordinate system, using the current settings of the pixlib module. The function arguments are the position in the TDET coordinate system. Two values are returned: the first one is the chip ID (the ccd_id value for ACIS and chip_id value for HRC data) and the second (pos) is a two-element array which gives the chip coordinates in pixels.
The pixlib module is not available by default; to use it in a S-Lang program, it must be loaded using the S-Lang require() function:
slsh> require( "pixlib" ); slsh> pix_init_pixlib; slsh> ( id, chip ) = pix_tdet_to_chip( 4620, 3573 ); slsh> print( id ); 3 slsh> print( chip ); 512 512
Using the default settings of the pixlib module (i.e. the detector is ACIS with the aimpoint on ACIS-I1), we find that the location (4620, 3573) in the TDET system corresponds to the chip position (512,512) on ACIS-3 (i.e. ACIS-I3)
See the bugs page for the pixlib library on the CIAO website for an up-to-date listing of known bugs.