Project: datamanagement
Issue DM-1969: Create a kind of Wcs that encapsulates a TAN WCS and a distortion model
We can simplify the astrometry solver if we have a Wcs that encapsulates a pure tangent-plane WCS and a distortion model that takes converts between PIXELS and TAN_PIXELS. This is useful because at the early stages of processing raw data we have a TAN WCS from the telescope control system and a pretty good estimate of distortion from the optical model (represented in the camera geometry). The result will be a Wcs whose sky<->pixel transformation is a reasonable approximation of reality (and a much better approximation than the tangent-plane WCS that is currently available. This will potentially eliminate a significant amount of confusing code that attempts to correct for distortion by manually applying the optical distortion model.
Story points: 4