WIP: Cubewcs mosaic and dask reproject #894
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keflavich
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e-koch
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spectral_cube/cube_utils.py
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| if specw1.wcs.cdelt == 1.0: | ||
| raise NotImplementedError("Spectral WCS doesn't have a CDELT parameter; we don't know how to deal with this generally.") | ||
| if np.sign(specw1.wcs.cdelt) == 1: | ||
| new_crval3 = ranges.min().to(u.Hz).value |
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Keep in the same spectral unit?
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| new_crval3 = ranges.min().to(u.Hz).value | |
| new_crval3 = ranges.min().value |
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CRVAL has to be in Hz - astropy wcs (wcslib) will force it to be if it isn't
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I don't think this is the case, or only is when the spectral axis is already in freq. If it's velocity, the default is to m/s.
I added a couple commits that restructure this part to ensure it inherits the appropriate default WCS spectral unit (and this fixed our existing mosaic tests in this PR for me).
e-koch
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keflavich
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WIP / stash
add missing import
import import
…(but it doesn't work right yet)
… add a lot of verbosity
…d CRVAL fixed while increasing NAXIS adds a bunch of useless blank pixels
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This is associated with astropy/reproject#351 and enables cube mosaicing with memory mapping. It might also work with astropy/reproject#388, but that's unclear.