Changes between Version 7 and Version 8 of Dvo_tutorial

Timestamp:

May 7, 2009, 4:14:24 AM (17 years ago)

Author:

Sebastian Jester

Comment:

add notes about making a CCD with flag-checking and error limit

Dvo_tutorial

@@ -159 +159 @@
  cplot RA DEC
 }}}
+
+= Make a colour-colour plot to find a g-dropout quasar =
+
+{{{
+
+region 14.84 0.05 1
+skyregion -1 -1 1 1
+avextract -region RA DEC g g:err r r:err i i:err z z:err y y:err flag
+# Not extended, not CR, not defect, not saturated, not bad PSF
+set notext = (flag & 0x7c00) == 0
+# Small errors only
+set in = r:err < 0.1
+# Select subsets satisfying both criteria
+subset ri_psf = ri if (notext && (in))
+subset gr_psf = gr if (notext && in)
+# can't do && !in ???
+# plot them
+limits gr_psf ri_psf
+clear;box;plot gr_psf ri_psf
+}}}
+See source:trunk/psModules/src/objects/pmSourceMasks.h for possible flag values
+
 = Things we want to know/do =
 
@@ -174 +196 @@
  relphot -D CATDIR . -D CAMERA gpc1 -averages -update
 }}} 
-If you have gpc1 as your default camera in your ~/.ptolemyrc, you can omit the -D CAMERA gpc1.
-
-{{{
+ If you have gpc1 as your default camera in your ~/.ptolemyrc, you can omit the -D CAMERA gpc1.
+
  The Relphot command comes from [wiki:IPPstripe82]
-}}} * Pull out star/galaxy separation flag, restrict sample to stars
+ * Pull out star/galaxy separation flag, restrict sample to stars
  * Filter on magnitude errors
  * Dump ra dec mag magerr stargalflag into ASCII file for customized analysis