Description
Survey property maps are a planned data product (and are included in the DP0.2 data set), but are not mentioned in the DPDD. The proposed change is to add Section 4.4.4 (title and text below) to the DPDD.
Updated 2022-12-07 and 09 (comments incorporated):
Section 4.4.4 Survey Property Maps
Several types of survey property maps will be generated and served to users. The properties are typically the mean or total values determined from the images input to generate the deep coadd. The types of maps will include the total exposure time; the point-source 5-sigma AB magnitude limit; the weighted mean of the PSF moments; the weighted mean of the sky background and sky noise; and the average effect of differential chromatic refraction (DCR) in the right ascension and declination directions, and in the PSF moments. Property maps based on statistics measured on deep coadds might also be generated.
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DM-36633 Update DPDD to include survey property maps
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Thanks Yusra, I removed "in HealSparse map format".
I'm increasingly of the opinion that most if not all of the metrics we measure on coadds (from objectTable_tract) should also be made into property maps. I assume that the current phrasing is deliberately not exclusionary but would it make sense to at least add a non-committal recommendation like "Property maps [may/should] also be generated based on statistics measured on deep coadds"?
That makes sense, thanks Dan. I added a final sentence:
"Property maps based on statistics measured on deep coadds might also be generated."
Melissa Graham are you intending to adopt this RFC or have you decided to withdraw it? If adopting please add the triggering ticket.
Adopted and initiated triggering ticket.
Over the years, its become clear that the DPDD over-specified the "how" when its scope was really the "what." With that in mind I'd recommend removing the how: the "in HealSparse map format" end of that first sentence.