DVO Release Notes from 2011.02.10

The 3pi database fixes have finished and the rsync server has been turned back on! Please feel free to restart your rsync jobs.

As a reminder, rsync will be smart enough to restart where it left off, and it should figure out the changes to the southern areas. if you are cautious, you could remove the s2230, s3000, and s3730 directories before restarting to ensure you get fresh copies.

Some notes on what this database contains:

• all 3pi data taken since the start of demo month (2010/2/12) through last week (2011/2/1).
• 2MASS detections matched to all objects
• average fields for grizy and JHK (eg, avextract g i J K would work)
• zero point calibrations for the PS1 data come from the synthetic photometry database.
• astrometric calibration is the default in-line calibration relative to the 2MASS frame
• average magnitudes use a weighted mean, and skip detections that have PSF_QF < 0.85 (excessively masked objects). there is no iterative clipping, however.

In addition, there are 4 bit flags available in the average table for each object to give a hint at quality and extendedness:

• for all PS1 detections, the detection is considered 'extended' if (mag_psf - mag_ap > 0.5)
• if the number of 'extended detections' exceeds the number of 'psf-like' detections, the object is flagged as "PS1 extended" (objflag & 0x01000000)
• if any of the detections have PSF_QF > 0.85, then the object is considered "PS1 good" (objflag & 0x04000000)
• similarly, if the 2MASS J-band flags indicate the source is extended, the object is considered "2MASS extended" (objflag & 0x02000000)
• if the 2MASS J-band detection is significant (), the source is considered "2MASS good" (objflag & 0x08000000)

note: A significant 2MASS source means their field ph_qual is one of the 3 classes A, B, or C, which means the source is > 5 sigma and has some quality limits. For more info, and s

Remember that the 2MASS detections maintain a lot of the 2MASS metadata for each detection. The summary of how that is represented in DVO is here: 2MASS_info_in_DVO