One of the principal selling points of Astrometry.net is that it can calibrate imaging even in the face of artifacts, occlusion, and spurious signal. Lang and I pair-coded some enhancements along these lines today, including an extremely robust method for determining the noise level in an image of unknown provenance (for example that has not been flat-fielded or background-subtracted), and some post-processing of detected source lists to remove bad CCD columns (a common problem in raw data).
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