Summary of MD01.refstack.20120803

Similar to the MD01.GR0 (MD.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.

MD01 observations started in August (last season started mid-August and ended mid-January).

Filter	N total	N FWHM<8 pixels	N (FWHM<8 pixels for 2011
g	520	421	144
r	489	430	136
i	555	505	187
z	659	602	243
y	365	337	179

MD01.V3 reference stack

Reference stack using data from 2010+2011, a balance of N input warps versus best seeing, excluding exposures with large background, low zeropoints, and large elongation.

• label: MD01.refstack.20120803
• data_group: MD01.refstack.20120803

Test stack (reftest) sample also made again for skycell.055 with different number of input warps.

• label: MD01.reftest.20120803
• data_group:
  • MD01.reftest.20120803.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp
  • MD01.reftest.20120803.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp
  • MD01.reftest.20120803.2011.<FWHM cut> where 2011 means 2011 data only, <FWHM cut>=cut <fwhm_major from camProcessedExp

	Histograms of the FWHM major and minor from camera stage for reprocessed all exposures (red) and refstack.20120705 (top blue) and refstack.2011 (bottom blue).

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 input warps (rej)	center skycell FWHM (major)
new MD01.refstack.20120803 V3	g	()	"
MD01.reftest.20120803.c1f V3 ()	g	()	"
old MD01.refstack.2011 V3	g	()	"
new MD01.refstack.20120803 V3	r	()	"
MD01.reftest.20120803.c1f V3 ()	r	()	"
old MD01.refstack.2011 V3	r	()	"
new MD01.refstack.20120803 V3	i	()	"
MD01.reftest.20120803.c1f V3 ()	i	()	"
old MD01.refstack.2011 V3	i	()	"
new MD01.refstack.20120803 V3	z	()	"
MD01.reftest.20120803.c1f V3 ()	z	()	"
old MD01.refstack.2011 V3	z	()	"
new MD01.refstack.20120803 V3	y	()	"
MD01.reftest.20120803.c1f V3 ()	y	()	"
old MD01.refstack.2011 V3	y	()	"

Test psphot run on refstack

Troubled skycells

Reftest Results

Refstack Comparisons