[AstroPy] Using oblique SIN projections in astropy

[Tim Cornwell]

Hi,

I’m trying to use oblique projections in astropy for the SIN (Slant Orthographic) projection. This is well-defined in the Greisen/Calabretta papers and in WCSLIB. I’m confident that casacore can do it but I’d prefer not to have to build CASA for this purpose (a reference library of calibration and imaging algorithms).

In astropy, I can see two different approaches:

	- Use the reproject package
	- Use astropy.modelling.projections package

I’m struggling with the former. The results do not seem correct. Before diving deeper (which would require building casacore for some comparisons), I’d like to know if trying the second approach is likely to work. What is the relationship between the two packages? 

Thanks,
Tim Cornwell

-- 
Tim Cornwell
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