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desihub / imaginglss

Code for doing large-scale structure studies with the imaging data.
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Remove parallel depth query from raw images in select-objects.py #13

Closed rainwoodman closed 6 years ago

rainwoodman commented 8 years ago

c.f. https://github.com/legacysurvey/legacypipe/issues/72

Because future versions of DECALS will have this for object catalogue, and imaginglss does use the same algorithm for reading out per pixel values from the depth maps, it appears we no longer have to query the raw images in select-objects.py. The amount of IO will be a lot smaller. As a consequence, the entire script doesn't need mpi parallelism any more, which could be a plus.

However we then lose the ability to cross-check the depth readout algorithm with tractor.

So this is not necessarily a good move.

rainwoodman commented 6 years ago

An option was added to the script to use either query.