wiki:DC3bPT1.2-3000

Version 5 (modified by rhl, 8 years ago) (diff)

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LSST DC3b PT 1.2 3000 run

We expect to carry out a third ("3000") processing run in July 2011; I'd like to start the machines running by the 8th.

This page is intended to help us decide what to include. Some of this is already done on trunk or a branch, but I'd like a list of everything that we want that is not in level 2000. Please sign your contributions; this is not a commitment to implement them. The basic idea is to get a stack that reflects where we are (or nearly are) as of 2011-07-01.

As I have the enviable task of shepherding this data, we need to have a way to test each adopted feature. Ideally this would mean a pipeQA plot, but in some cases all I need is the test that shows that we really did implement the feature (e.g. the Chebyshev changes).

Desired Features

Chebyshev interpolation (RHL)
For PSF interpolation (using the RHL pcaPsf for now). Test: confirm that high-order polynomials make sense.
A star/galaxy number (RHL)
Probably based on the instFlux (==gaussianFlux) or the modelFlux from UCDavis. Test: use the numbers in pipeQA
Proper flat fields (RHL)
There is evidence of problems in the corners of the array. Test: look at pipeQA's (psf - cat) plots
Proper propagation of measurement masks
From measurement to Source; no need to handle proper assigment of bits to different algorithms (i.e. a single global enum is OK for now). Test: look at the output bits
Diffim for snap pairs (ACB)
This needs to be implemented as a pipeline of some sort; possibly using a single pipette-based stage + two I/O stages. Test: ???
aperture corrections for model fluxes (RHL)
The modelFlux for a point source must equal the PSF flux. N.b. this requires that the same aperture correction be applied as for the psfFlux. Test: the pipeQA (psf - model) plots have a nice stellar locus
cleanup aperture correction application code (RHL)
The current code (in the stage) is specific to psf mags + cut-and-paste copies [mea culpa]. Test: Look at the code; also needed to support the previous item
Look at background level bias (RHL)
I think that there's evidence for a bias at the two DN level. Test: Look at pipeQA's (psf - ap) for larger apertures.

Things that should not be included

Cleanup of Policy (RHL)
Replacement of sets of stages with pipette mega-stages (RHL)