Changes between Initial Version and Version 1 of MWV_Megacam_MOPS_Subtractions

Timestamp:

Feb 24, 2009, 4:23:57 PM (17 years ago)

Author:

trac

Comment:

--

MWV_Megacam_MOPS_Subtractions

@@ +1 @@
+Michael Wood-Vasey and Joel Welling have been working on sampl;e subtraction of CFHT Megacam MOPS images to shake down subtractions, detection of transient events.  Eventually we'll look at stacking.  We're doing this in a database-free mode since there's an MWV-countable number of images.
+
+Here's the basic process to start with a set of MEF files with a chip in each image in a directory 'proc/'.
+
+First we make a set of tessellations.
+
+ skycells 8 -scale 0.2 -D CATDIR skycells
+
+Extract an empty image with the WCS for the tesselation we want (skycell.0198755).  I don't know how to figure out what this is for an arbitrary position on the sky.  I'm sure there's an easy way; please add here.
+
+ dvoImageExtract skycell.0198755 -D CATDIR skycells -D CAMERA megacam -o skycell_0198755_warptemplate.fits
+ mkdir skycell.0198755
+
+Run a sample MEF file through (proc/906622.ch.fits)
+
+ pswarp -file proc/906622.ch.fits -mask proc/906622.ch.mk.fits -weight proc/906622.ch.wt.fits \
+    skycell.0198755/906622 skycell_0198755_warptemplate.fits -astrom proc/906622.cmf
+
+And then run the last command for each of the .ch.fits files in proc/.
+
+ foreach base ( `ls proc/*.ch.fits | sed -e 's/\..*//g' | sed -e 's/proc\///'` )
+ foreach? pswarp -file proc/$base.ch.fits -weight proc/$base.ch.wt.fits -mask proc/$base.ch.mk.fits \
+    -astrom proc/$base.cmf skycell.0198755.new/$base skycell_0198755_warptemplate.fits -psf >& $base.log 
+ foreach? end
+
+
+This should generate a skycell.0918755 directory with images warped to the chosen tessellation.