= Summary of MD02.refstack.20120827 =
[[PageOutline]]

Similar to the MD02.GR0 ([wiki:MD.GR0#MD02.GR0]) refstacks for the 2011/2012 season, these include recent improvement and input cuts to help constrain the convolved stacks as well. Because the refstack is made with reprocessed pixels, the refstack pixels will now have the ubercalibration.

MD02 observations started Sept. 27 (last season started mid-Sept. and ended end of February).


|| '''Filter''' || '''N total''' || '''N (FWHM<8 pixels)''' || 
|| || || ||
|| g || 331 || 260 ||
|| r || 327 || 281 ||
|| i || 427 || 386 ||
|| z || 509 || 483 ||
|| y || 386 || 340 ||
|| || || ||

== MD02.V3  Processing (chip->warp + refstack) ==

Exposure reprocessing was done for only a limited number (~150) of the best images from 2010+2011 to provide a balance of N input warps versus best seeing, excluding exposures with large background, low zeropoints and large elongation. Processing chip-warp and the refstack itself has the same label, data_group
 * label: MD02.refstack.20120927 --> ''once set as active refstack for diffims, stack label will change to MD02.refstack'', chip/cam/warp label will remain the same
 * data_group: MD02.refstack.20120927


Histograms of the FWHM major and minor and elongation from camera stage value (full exposure) for the sample of reprocessed exposures (red) and used for refstack.20120927 (top blue) and used for refstack.2011 (bottom blue).

|| [[Image(MD02.refstack.20120927-MD02.refstack.20120927.s055-MD02.refstack.20110907.s055.g.expfwhm.png,300px)]] || [[Image(MD02.refstack.20120927-MD02.refstack.20120927.s055-MD02.refstack.20110907.s055.r.expfwhm.png,300px)]] ||
|| [[Image(MD02.refstack.20120927-MD02.refstack.20120927.s055-MD02.refstack.20110907.s055.i.expfwhm.png,300px)]] || [[Image(MD02.refstack.20120927-MD02.refstack.20120927.s055-MD02.refstack.20110907.s055.z.expfwhm.png,300px)]] ||
|| [[Image(MD02.refstack.20120927-MD02.refstack.20120927.s055-MD02.refstack.20110907.s055.y.expfwhm.png,300px)]] ||   ||


Test stack (reftest) sample also made again for skycell.055 with different number of input warps. Found skycell.055 may not be a good indicator of FWHM with different number of inputs, also did sample for skycell.033.
 * label: MD02.reftest.20120927
 * data_group: 
  * MD02.reftest.20120927.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut  <fwhm_major from camProcessedExp
  * MD02.reftest.20120927.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp
  * MD02.reftest.20120927.2011.<FWHM cut> where 2011 means 2011 data only, <FWHM cut>=cut <fwhm_major from camProcessedExp


Summary comparison table with the approximate FWHM (major) as the PSF FWHM from a center field skycell (V3=055) after running psphot on the stacks. Because the reftests were all run on the same date, the stack_id is important to note to separate by filter as well.

|| || || || ||
|| '''version data_group''' (stack_id) || '''filter''' || '''center skycell.055 input warps (rej)''' || '''center skycell.055 FWHM (major pixels)''' ||  '''skycell.033 input warps (rej)''' || '''skycell.033 FWHM (major pixels)''' || 
|| || || || ||
|| new ''MD02.refstack.20120927''  || g ||  78(29) || 5.52 ||   78(15) || 4.50 ||
|| MD02.reftest.20120927.all.55  (1503420) || g ||  79(31) || 5.52  ||   79(24) || 4.49 ||
|| MD02.reftest.20120927.2011.55  (1503421) || g ||  41(15) || 5.36  ||   41(8) || 4.47 ||
|| MD02.reftest.20120927.c1f52  (1505150) || g ||  37(10) || 5.56  ||   37(12) || 4.37 ||
|| MD02.reftest.20120927.c1f54  (1505151) || g ||  61(20) || 5.49  ||   61(19) || 4.43 ||
|| MD02.reftest.20120927.c1f61  (1505152) || g ||  93(37) || 5.54  ||   93(24) || 4.54 ||
|| MD02.reftest.20120927.c1f62  (1505153) || g ||  104(47) || 5.33  ||   104(28) || 4.58 ||
|| old MD02.refstack.20110907   || g ||  64(6) || 5.28 ||   64(4)  || 4.68 ||
|| || || || || || ||
|| new ''MD02.refstack.20120927''  || r ||  85(18) || 4.46 ||   85(20) || 4.41 ||
|| MD02.reftest.20120927.all.49  () || r ||  88(20) || 4.96  ||   88(24) || 4.06 ||
|| MD02.reftest.20120927.2011.49   () || r ||  50(15) || 4,91  ||   50(12) || 4.07 ||
|| MD02.reftest.20120927.c1f 45 () || r ||  36(8) || 4.79  ||   36(7) || 3.97 ||
|| MD02.reftest.20120927.c1f47  () || r ||  63(11) || 4.87  ||   63(17) || 4.01 ||
|| MD02.reftest.20120927.c1f51   () || r ||  89(20) || 4.93  ||   89(20) || 4.09 ||
|| MD02.reftest.20120927.c1f58  () || r ||  118(34) || 5.02  ||   118(37) || 4.15 ||
|| old MD02.refstack.20110907   || r ||  63(6) || 4.6 ||   63(5) || 4.19 ||
|| || || || || || ||
|| new ''MD02.refstack.20120927''   || i ||  86(22) || 4.41 ||   86(19) || 3.89 ||
|| MD02.reftest.20120927.all.45  () || i || 89(21) || 4.31  ||   89(23) || 3.81 ||
|| MD02.reftest.20120927.2011.45  () || i || 40(12) || 3.71 ||   40(10) || 3.75 ||
|| MD02.reftest.20120927.c1f41   () || i || 34(7) || 4.26  ||   34(9) || 3.70 ||
|| MD02.reftest.20120927.c1f43   () || i || 54(9) || 4.33  ||   54(13) || 3.80 ||
|| MD02.reftest.20120927.c1f48   () || i || 92(27) || 4.43 ||   92(27) || 3.88 ||
|| MD02.reftest.20120927.c1f52   () || i || 121(23) || 4.47  ||   121(35) || 3.96 ||
|| old MD02.refstack.20110907   || i || 61(2) || 4.0 ||   61(1) || 3.99 ||
|| || || || || || ||
|| new ''MD02.refstack.20120927''   || z ||   92(22) || 3.85 ||   92(26) || 3.65 ||
|| MD02.reftest.20120927.all.41  () || z ||  91(28) || 3.78  ||   91(23) || 3.63 ||
|| MD02.reftest.20120927.2011.41  () || z ||  40(10) || 3.70  ||   40(8) || 3.67 ||
|| MD02.reftest.20120927.c1f38   () || z ||  25(7) || 3.54  ||   25(5) || 3.37 ||
|| MD02.reftest.20120927.c1f40   () || z ||  58(20) || 3.87  ||   58(12) || 3.55 ||
|| MD02.reftest.20120927.c1f42   () || z ||  92(22) || 3.85  ||   92(26) || 3.64 ||
|| MD02.reftest.20120927.c1f45   () || z ||  116(27) || 3.90  ||   116(22) || 3.70 ||
|| old MD02.refstack.20110907   || z || 67(5) || 3.6 ||   67(2) || 3.75 ||
|| || || || || || ||
|| new ''MD02.refstack.20120927''  || y ||   86(25) || 3.62 ||   86(17) || 3.47 ||
|| MD02.reftest.20120927.all.41  () || y ||  95(29) || 3.60  ||   95(18) || 3.48 ||
|| MD02.reftest.20120927.2011.41  () || y ||  86(16) || 3.60  ||   86(27) || 3.44 ||
|| MD02.reftest.20120927.c1f38  () || y ||  35(5) || 3.52  ||   35(8) || 3.35 ||
|| MD02.reftest.20120927.c1f39   () || y ||  61(11) || 3.57  ||   61(8) || 3.43 ||
|| MD02.reftest.20120927.c1f42   () || y ||  96(21) || 3.62  ||   96(23) || 3.51 ||
|| MD02.reftest.20120927.c1f46   () || y ||  118(25) || 3.64  ||   118(38) || 3.51 ||
|| old MD02.refstack.20110907   || y || 58(3) || 4.04 ||   58(2) || 4.38 ||
|| || || || || || ||

The center skycell often has a problem with worse seeing so added skycell.033 for comparison.  Overall very little improvement in FWHM is possible (~0.2 pixels with minimum number of inputs as with other fields), but now depth is similar with other MD.
== Problems ==
 * some convolved stacks have strange PSF -- reprocessed using DEEP_STACK config and may not have best FWHM, but on the edge of field so won't anyways.
  * g: 012,017,061,071,082,087
  * r: 012,021,031,071,087
  * i: 017,071,078,087
  * z: 017
  * y: 017,071,087
 * bad cell arc in primarily skycell.036 y-band from ota14, cell 31 seen in MD01 as well (MD10?)
[[Image(MD02..png,300px)]] 
 * poor/bad cell arc in primarily skycell.054 g-band (and less so in other filters) from ota43, cell 54?
[[Image(MD02..png,300px)]]  




== Refstack Summary ==

Refstacks run through the staticsky (single filter mode so basic psphot with deteff measurements) and skycal stage on the unconvolved stacks:
 * label: MD02.refstack.20120927, MD02.refstack.20120927
 * data_group:  MD02.refstack.20120927.1x20121005, MD02.refstack.20120927.1x20121005.cal20121005
A mess of previous runs were made including a full 5 filter psphotStack run, but some skycells have been swapped and is not entirely valid. The skycal stage also had to be modified after a fix to getstar and likely needs to be further tuned properly. A full stack photometry rerun will need to be made in the future.

Source photometry psf_major,_minor maps (grizy):

|| [[Image(md02v2012x1v2skycal_cmf_g.txt_psfmap.png,300px)]] || [[Image(md02v2012x1v2skycal_cmf_r.txt_psfmap.png,300px)]] ||  [[Image(md02v2012x1v2skycal_cmf_i.txt_psfmap.png,300px)]] ||  [[Image(md02v2012x1v2skycal_cmf_z.txt_psfmap.png,300px)]] ||  [[Image(md02v2012x1v2skycal_cmf_y.txt_psfmap.png,300px)]] ||   


Magnitude of sources@5-sigma maps (grizy):

|| [[Image(md02v2012x1v2skycal_cmf_g.txt_mag5sigmap.png,300px)]] || [[Image(md02v2012x1v2skycal_cmf_r.txt_mag5sigmap.png,300px)]] ||  [[Image(md02v2012x1v2skycal_cmf_i.txt_mag5sigmap.png,300px)]] ||  [[Image(md02v2012x1v2skycal_cmf_z.txt_mag5sigmap.png,300px)]] ||  [[Image(md02v2012x1v2skycal_cmf_y.txt_mag5sigmap.png,300px)]] || 


Detection efficiency magnitude @50% recovery (500 fakes, grizy):

|| [[Image(md02v2012x1v2skycal_cmf_g.txt_mag50gridmap.png,300px)]] || [[Image(md02v2012x1v2skycal_cmf_r.txt_mag50gridmap.png,300px)]] || [[Image(md02v2012x1v2skycal_cmf_i.txt_mag50gridmap.png,300px)]] || [[Image(md02v2012x1v2skycal_cmf_z.txt_mag50gridmap.png,300px)]] || [[Image(md02v2012x1v2skycal_cmf_y.txt_mag50gridmap.png,300px)]] ||