Goal
Keywords: class-projection

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Goal

The goal of the present CLASS (data format and library) improvements is to provide a (much) less restrictive list of supported projections. This revision relies on the GREG projection engines which support:

- more projection systems, namely: none (unprojected spherical coordinates), gnomonic, orthographic, azimuthal, stereographic, lambert, aitoff, radio, and sfl.
- non-zero projection angles (when allowed by the projection system). Before this revision, this support was not possible in CLASS since there was no provision of such angle in the CLASS Data Format.

With these improvements, a direct application is for example the native support of the rotated (i.e. scanning is not performed along azimuth or elevation) On-The-Fly mapping when observing at the telescope, using the azimuthal projection with a non-zero angle.