S. Bardeau, J. Pety
March, 26 2015
Version 1.0
1. IRAM (Grenoble)
Up to now, CLASS only supported natively the radio projection of
the sky spherical coordinates. The main limitation of the radio
projection is the absence of support of a projection angle. This
could imply some approximation in the handling of On-The-Fly data
with rotated scanning directions. CLASS now supports all the
projections already supported in the GILDAS kernel, i.e., none
(unprojected spherical coordinates), gnomonic, orthographic,
azimuthal, stereographic, lambert, aitoff, radio, and sfl. This
required the introduction of the MODIFY PROJECTION command,
the modification of the MODIFY POSITION command, and the
modification of the position header section in the CLASS Data
Format. This memo describes all this in details.
Keywords: coordinates, (re)projection, CLASS Data Format
Related documents: CLASS documentation, CLASSIC Data Container