Changes between Initial Version and Version 1 of PS1_3pi_DVO_20110421

Timestamp:

May 3, 2011, 11:04:12 AM (15 years ago)

Author:

eugene

Comment:

--

PS1_3pi_DVO_20110421

@@ +1 @@
+== PS1 3pi DVO Database Snapshop 2011.04.21 ==
+
+The latest 3pi DVO database release can be found at the following location:
+
+{{{rsync://ipp0032.ifa.hawaii.edu/ps1-3pi-catdirs-20110421}}}
+
+This rsync location is protected with a password, see your DRAVG representative for information
+
+The following plots show the coverage in g,r,i,z,y.
+
+This database is similar in contents to the previous (2011/2/1) database.  
+
+Some notes on what this database contains:
+
+ * all 3pi data taken since the start of demo month (2010/2/12) through the start of April (2011/4/1)
+ * 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)
+
+** 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 information about 2MASS representation in DVO, see [wiki:2MASS_info_in_DVO].