DVO Seed Database

As the IPP analysis proceeds during the PS1 Survey, all detections measured in the chip stage (and astrometrically calibrated in the camera stage) are ingested into a working science DVO database. More accurately, the 3pi observations are ingested into one DVO database, while those from the deep pointings are ingested into another database. The database that is used is seeded with observations from 2MASS. Not only can many science projects benefit from being able to select objects with known JHK colors, but the 2MASS measurements can be used as an astrometric anchor during relative astrometry analyses, especially in the first year when the PS1 coverage is not complete.

A copy of the seed DVO database is kept on the cluster so that new DVO databases can be started with a clean reference. If we desire to re-ingest all or a fraction of the detections at any time, we can use the same seed database.

The seed database is generated on ipp022 in manoa and copied to MHPCC. Here are the commands we are using to generate the 2mass seed database (see discussion here: 2MASS, USNO-B, SDSS Merge).

load2mass -D PHOTCODE_FILE dvo.seed.photcodes -D CATDIR catdir.2mass -v -replace -region 0.0 360.0 -90.0 -30.0 &
load2mass -D PHOTCODE_FILE dvo.seed.photcodes -D CATDIR catdir.2mass -v -replace -region 0.0 360.0 -30.0   0.0 &
load2mass -D PHOTCODE_FILE dvo.seed.photcodes -D CATDIR catdir.2mass -v -replace -region 0.0 360.0   0.0 +30.0 &
load2mass -D PHOTCODE_FILE dvo.seed.photcodes -D CATDIR catdir.2mass -v -replace -region 0.0 360.0 +30.0 +90.0 &