ska-sciencedataprocessor / crocodile Goto Github PK
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License: Apache License 2.0
Repo for simple reference code
License: Apache License 2.0
As Anna commented in the Radio Cortex specification, Hogbom produces a clean image, a model image and residual. We believe this maps to comps+res
, comps
and res
respectively, but this is never documented explicitly.
The way gridding works, we have a few connected characteristics of the handled data:
doimg
, we "mirror" coordinates and conjugate visibilities. In my understanding, this is correct because it reflects "inverted" baselines.It would make the program easier to follow if this was spelled out explicitly.
Calls to wkernelaf in synthesis.py contain hard-coded numbes 257 and 15. Those would be better understood if they had text names. Also, should those be adjustable in any way?
Crocodile's 'inv' function is described as "Invert a hermitian-symetric two-dimensional grid. The hermitian symetric dimension is the second (last) index, like in numpy.fft":
Line 211 in 8d5132f
AFAIUI, this is related to how the sample uv data are generated, see
Line 356 in 8d5132f
The question is: what if we use uv data generated by Oskar? Do they have the same structure (hermitean-symmetric)? And if they have more general structure then how should 'inv' look like in this general case?
The first parameter of 'overlapIndices' is 'dirty here: https://github.com/SKA-ScienceDataProcessor/crocodile/blob/master/clean.py#L73. Is this correct? Shouldn't it be 'res' instead perhaps?
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