Quality holes in DR1 coverage
The following is a reference note on quality of fields, including
hole fields in the DR1 data set.
Each field of DR1 has a
quality set. This quality is determined by the seeing of the
field, the tracking of the stripe, the cloudiness of the data
(photometric or not), and whether or not the photometric pipeline timed out
while processing.
The quality is designated by an integer from 0-5, and is stored in
the quality parameter of the tsField*.fit file for
each field. Here's a key to what that quality means.
0=UNDETERMINED, // The data has been obtained, however its
// quality has not yet been determined.
1=BAD, // Bad data. Don't bother with it.
2=ACCEPTABLE, // The data is acceptable for the survey, but we would
// like to improve on it.
3=GOOD, // The data is fully acceptable for the survey, and
// there is no need to improve it.
4=MISSING, // The data is missing, but we include the area of
// sky associated with the data as a hole in the
// survey.
5=HOLE // The data is unacceptable, but we include the area
// of sky associated with the data as a hole in the
// survey.
Also in the tsField file are more details on exactly why quality was set to
what it was.
For instance, if the tsField file has a
frames_status value of 3 = FIELD_TOO_LONG ,
meaning the field timed out during processing, this results in a
quality = 5 (HOLE) for the overall field quality.
The psp_status is also available in the tsField file,
as are the culled, badmask,acceptablemask,goodmask and
holemask masks.
We note that there are different holes in the best version of sky than the target version. This is due
to the photometric pipeline timing out for a number of fields
processed with pipeline version v5_3. By the time we realized we were
getting significantly more timeouts from this new version, we
increased the allowed time per field from 2 hours to 4 hours (a normal
field takes 5 minutes or less), but didn't catch all the fields we
could. In other words, if we had let these run longer, they may have
finished successfully. Future data releases will include these
data.
The timeouts are almost always on fields with very bright stars or
flares (from the edge) in them.
There are also some holes where photo finished ok; in these cases
(where the frames_status is 0), some other problem
with the quality, generally either a short non-photometric patch of
sky or astrometric wobble, inclines us to set a range of fields to
hole.
Fields which are marked as hole will show up as holes
in the large scale structure masks; objects detected in those fields are not
included in the data release. The following table lists the
holes in the DR1 fields.
Target skyVersion holes
run rerun camcol fieldstart-end 'quality (5=hole)' 'frames_status (3=timeout,0=ok)'
-------------------------------------------------------------------------
1737 0 6 30 5 3
1889 1 4 42 5 3
1895 0 1 170-185 5 0
1895 0 1 268-285 5 0
1895 0 2 170-185 5 0
1895 0 2 268-285 5 0
1895 0 3 170-185 5 0
1895 0 3 268-285 5 0
1895 0 4 170-185 5 0
1895 0 4 268-285 5 0
1895 0 5 170-185 5 0
1895 0 5 268-285 5 0
1895 0 6 170-185 5 0
1895 0 6 268-285 5 0
1992 0 1 141 5 3
1992 0 1 168 5 0
1992 0 2 130 5 3
2074 0 5 174 5 3
2126 0 4 278 5 3
2126 0 6 341 5 3
2248 0 1 186-196 5 2
2248 0 2 186-196 5 2
2248 0 3 186-196 5 2
2248 0 4 186-196 5 2
2248 0 5 186-196 5 2
2248 0 6 186-196 5 2
2328 0 1 77 5 3
Best skyVersion holes
run rerun camcol fieldstart-end 'quality (5=hole)' 'frames_status (3=timeout,0=ok)'
-------------------------------------------------------------------------
752 20 2 205 5 3
752 20 2 276-277 5 3
752 20 5 692 5 3
752 20 6 660 5 3
756 20 1 390 5 3
756 20 2 587 5 3
756 20 3 338 5 3
756 20 4 162 5 3
1035 20 5 40 5 3
1035 20 6 112-113 5 3
1043 20 6 149 5 3
1140 20 2 131 5 3
1140 20 6 250-251 5 3
1231 21 3 195 5 3
1231 21 6 141-142 5 3
1331 20 5 141 5 3
1331 20 5 75 5 3
1345 21 2 607 5 3
1350 22 2 442-443 5 3
1359 21 3 60 5 3
1412 20 3 315 5 3
1450 20 6 71 5 3
1458 20 3 646 5 3
1458 20 4 674 5 3
1462 21 2 349 5 3
1462 21 2 568 5 3
1462 21 4 585 5 3
1462 21 4 670 5 3
1462 21 5 88 5 3
1462 21 6 399 5 3
1462 21 6 457-458 5 3
1729 21 1 266 5 3
1729 21 1 373 5 3
1729 21 3 195-196 5 3
1729 21 5 281 5 3
1737 20 3 115 5 3
1737 20 6 30-31 5 3
1740 21 2 135 5 3
1740 21 2 95 5 3
1740 21 6 54 5 3
1895 21 1 270-280 5 0
1895 21 2 270-280 5 0
1895 21 3 270-280 5 0
1895 21 4 270-280 5 0
1895 21 5 270-280 5 0
1895 21 6 270-280 5 0
1896 20 5 109 5 3
1992 20 2 130 5 3
2075 20 2 48 5 3
2076 20 1 140-141 5 3
2125 21 1 132 5 3
2125 21 5 80 5 3
2126 21 4 278 5 3
2126 21 6 341 5 3
2131 21 6 25-26 5 3
2137 21 2 279-280 5 3
2137 21 3 243 5 3
2137 21 3 267 5 3
2137 21 6 183 5 3
2189 20 3 57 5 3
2190 21 1 144 5 3
2207 20 6 60 5 3
2243 20 1 130-131 5 3
2243 20 4 130-131 5 3
2247 20 1 285 5 3
2299 20 1 299-300 5 3
2299 20 3 283 5 3
2305 20 3 38-39 5 3
2305 20 4 65 5 3
2326 20 2 299 5 3
2326 20 2 309-310 5 3
2328 20 1 122 5 3
2328 20 1 77-78 5 3
2328 20 2 175 5 3
2328 20 4 38 5 3
2335 20 6 74 5 3
2662 20 2 257 5 3
2738 20 4 155 5 3
2738 20 4 184-185 5 3
2738 20 4 280 5 3
3325 20 1 196 5 3
3325 20 1 354 5 3
3325 20 1 362 5 3
3325 20 1 430 5 3
3325 20 3 246 5 3
3325 20 3 483 5 3
3325 20 4 99 5 3
3325 20 5 345 5 3
3325 20 5 470 5 3
3325 20 6 287 5 3
Last modified: Thu Apr 17 13:42:58 CDT 2003
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