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.