updated 2MASS Sky Coverage of Extended Source Classification

As part of the GALWORKS engineering checkout phase and post-processing catalog generation, a number of RTB fields (see e.g. Validation Fields ) have been carefully examined to produce a "truth" table or classification set. Output sources from GALWORKS, which are nominally galaxies or extended sources, are examined and compared with the DSS when possible. The sources are classified as one of the following:

1. galaxies or extended objects
2. isolated stars
3. double stars
4. triple stars
5. artifacts (meteors, bright star features) or pieces thereof
6. unknown (re: difficult to classify accurately)

Among other things, we will use the "truth" tables to build "training" sets with the goal to construct an automated classification machine (via decision trees or neural nets, for example). The gif(s) below show the cummulative "truth" sets on the sky. Our goal is to fill a large fraction of the sky (globe) with accurately classified objects.

• Sky Coverage to date (980402) of classified 2MASS sources
  including some southern hemisphere data (orion, lmc, abell 3558); # sources > 14,000

• Sky Coverage to date (980406) of classified 2MASS sources
  including some southern hemisphere data (orion, lmc, abell 3558); # sources > 15,700

• Sky Coverage to date (980408) of classified 2MASS sources
  # sources > 16,800

• Sky Coverage to date (980410) of classified 2MASS sources
  # sources > 17,500

• Sky Coverage to date (980417) of classified 2MASS sources
  # sources > 18,800

• Sky Coverage to date (980427) of classified 2MASS sources
  # sources > 20,000

• Sky Coverage to date (980501) of classified 2MASS sources
  # sources > 23,000

• Sky Coverage to date (980519) of classified 2MASS sources
  # sources > 26,000

• Sky Coverage to date (980701) of classified 2MASS sources
  # sources > 28,000

• Sky Coverage to date (980716) of classified 2MASS sources
  # sources > 33,000

• Sky Coverage to date (980918) of classified 2MASS sources
  # sources > 40,000