Medium Deep U Band (megacam)

John looked up on CADC information on MD fields observed in U Band. Here it is:

TJD	MD 01	02	03	04	05	06	07	08	09	10
~4681	0	0	0	0	0	0	0	44	39	16
~4710	0	0	0	0	0	0	0	0	0	6
~4740	4	0	0	0	0	0	0	0	9	39
~4769	4	0	0	0	0	0	0	0	0	0
~4799	26	26	47	44	27	0	0	0	0	0
~4828	29	28	21	3	28	40	0	0	0	0
~4858	0	0	62	6	0	24	0	0	0	0
~4887	0	0	60	34	0	0	0	0	0	0
~4917	0	0	13	44	14	50	0	0	0	0
~4946	0	0	0	0	0	42	14	36	0	0
~4976	0	0	0	0	0	0	12	16	48	0
~5005	0	0	0	0	0	0	23	28	28	30
~5035	0	0	0	0	0	0	0	5	64	25
~5064	17	0	0	0	0	0	0	0	31	44
~5094	11	25	0	0	0	0	0	0	0	10
~5123	37	40	26	0	0	0	0	0	0	0
~5153	0	6	25	25	7	0	0	0	0	0
~5182	65	23	30	0	20	27	0	0	0	13
~5212	0	27	0	1	0	0	0	0	0	0
~5241	27	25	7	0	0	0	0	0	0	0
~5271	0	0	53	25	0	0	0	0	0	0
~5300	0	0	0	22	0	0	0	0	0	0
~5359	0	0	0	0	0	0	5	0	17	0
~5389	0	0	0	0	0	0	0	0	25	4
~5477	0	0	0	0	0	0	0	0	0	11
~5507	0	0	0	0	0	0	0	0	0	23

This is the number of observations on the field, where there are 7 pointings per field and evidently many dithers. Our job will be to put together the dithers into a stack, probably for each lunation, and then the JTMD stuff can assemble the full-up stacks. But this may turn out not to make sense if there are not all 7 pointings per lunation, so it's all TBD.

ipp + megacam

Gene has stacked these u band before (in eamMC database). I copied his database to 'megacam', and updated the schema. I've tried stacking by lunation for JT, with mixed results:

• there are quite a few skycells with bad astrometry
• all of MD06 has bad astrometry
• some do not have good coverage - I may need to stack multiple lunations to get it
• quite a few of the images have bad crosstalk - this is present in the initial images from CADC, but not present in the stacks (does this just get averaged out?) we had downloaded the raw for some subset of MCMD - the correct images have been downloaded.

Things that I need to do to get it working properly

• work on the astrometry - Gene has a few suggestions which I will try to implement
• make some more stacks (for tests)
  • do I need to filter out the bad astro?
  • stack together a few lunations - does this improve?
  • stack together all lunations - does my stack look similar to Gene's stacks (his is from much older code)
  • stack together all lunations - does my stack look similar to Gene's stacks (his is from much older code)