DVO Example using the Simtest reference database

This example uses the simtest reference database (catdir.grizy.simtest). The ptolemy.rc file attached to this page may also be useful.

• Display the area covered by the database:

catdir catdir.synth.simtest/
resize 1000 500
region 180 0 90 ait
cgrid -c red; skycat

• Zoom in on an area with data:

  region 151 3.5 3.0
  box
  skycat -c red -lw 2
  pmeasure -all -m 10 15 -pt 7
  label -x "ra offset" -y "dec offset" +x "region 151 3.5 3.0"
  png -name sample.region.large.png
  

• Zoom in on a smaller region

  region 151 3.5 0.25
  box
  pmeasure -all -m 10 15 -pt 7
  label +x "region 151 3.5 0.25"
  png -name sample.region.small.png
  

• Make a color-color diagram (average magnitudes)

  avextract -region ra, dec, objid, g_SYNTH, r_SYNTH, i_SYNTH, z_SYNTH, y_SYNTH
  set gr = g_SYNTH - r_SYNTH
  set ri = r_SYNTH - i_SYNTH
  lim -n 1 gr ri; clear; box; plot gr ri
  label -x "g - r" -y "r - i"
  png -name sample.cmd.png
  }
  [[Image(sample.cmd.png)]]
  
  * Extracting data on a specific object (three methods):
  {{{
  gstar -m ra[0] dec[0] 0.001
  gstar -m ra[0] dec[0] 0.001 -full
  mextract -region RA, DEC, MAG, TIME where ((abs(RA - ra[0]) < 0.001) && (abs(DEC - dec[0]) < 0.001))
  }}}