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LSSTDESC / DEHSC_LSS

Scripts and workflow relevant to HSC data
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SLAC hack day results 2: mapping #13

Closed damonge closed 6 years ago

damonge commented 6 years ago

Summarizing the work done during the hack day on how to use information about per-frame systematics to build up maps. This was led by @wagoner47 :

We will use the methods described in https://arxiv.org/pdf/1507.05647.pdf and https://arxiv.org/pdf/1507.05360.pdf and used for the analysis of DES-SV data. The process is to use the frames table, locating the position in the sky of each exposure and building, for each pixel, an array of values of systematic 's' in all exposures that fall (or partially fall) within that pixel. A preliminary version of the systematic maps would be created by flattening those arrays (e.g. using the median of all values).

@wagoner47 is already using the flat-map code we've been using, and I'm keen to also help with this. Let's use this issue to track progress!

damonge commented 6 years ago

The current framework for systematics mapping is described in the README