astrometry in the presence of defects

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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