Performance on projected vs unprojected images

[Bekah Albach]

Hi, 

I'm curious about the performance of astrometry.net on projected vs unprojected images (for example, detector space images). When I run a projected image and detector space image of the same area, the resulting solution varies slightly, and I think the detector space solution is more correct. Is astrometry.net meant to run on only unprojected images?

Thanks,

Rebekah Albach 

[Dustin Lang]

Hi,

I'm not exactly sure what you mean by project/unprojected/detector-space.  The core astrometry.net algorithms are designed around TANgent-plane projections.

The "tweak" algorithm is supposed to fit for a polynomial distortion that takes pixel space (maybe what you're calling detector space) to a TANgent-plane.

cheers,

dustin

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