Changes between Initial Version and Version 1 of 2MASS,_USNO-B,_SDSS_Merge

Timestamp:

Feb 24, 2009, 4:23:53 PM (17 years ago)

Author:

trac

Comment:

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2MASS,_USNO-B,_SDSS_Merge

@@ +1 @@
+
+The 2MASS ingest is the slowest of the bunch: most of the time is spent parsing the free-form catalog files.  We need to use the special 'load2mass' command to upload 2MASS data.  I ran for instances of this command on ipp000, each updating a separate region of the sky (this should be Dec-bands because of the way 2MASS data is stored).  Here is an example for dividing the load across 4 roughly equal area patches:
+
+ load2mass -D CATDIR catdir.2mass -v -replace -region 0.0 360.0 -90.0 -30.0
+ load2mass -D CATDIR catdir.2mass -v -replace -region 0.0 360.0 -30.0   0.0
+ load2mass -D CATDIR catdir.2mass -v -replace -region 0.0 360.0   0.0 +30.0
+ load2mass -D CATDIR catdir.2mass -v -replace -region 0.0 360.0 +30.0 +90.0
+
+The -replace flag means that only a single 2MASS measurement per filter is associated with each object.  The -v flag increases the verbosity.
+
+Next, add in the USNO-B data.  Here are the commands loading the full sky in one pass for each filter:
+
+ addstar -D CATDIR 2mass/catdir.merge -cat USNOB -photcode USNO_BLUE -replace -v
+ addstar -D CATDIR 2mass/catdir.merge -cat USNOB -photcode USNO_RED  -replace -v
+ addstar -D CATDIR 2mass/catdir.merge -cat USNOB -photcode USNO_N    -replace -v