DVO Example using the Simtest reference database

(Up to DVO Top Level)

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
  

• 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))