Scan offsets
Keywords: mrtcal-prog-manual

Next: Antenna offsets Up: Positions Previous: Reference position Contents

#
Scan offsets

From the absolute reference defined at , the IMBFITS format can define an intermediate position, through the `SYSOFF`, `XOFFSET` and `YOFFSET` columns in the `SCAN` table

- if only the Nasmyth row is present, an implicit projection row is added at read time with (0,0) offsets,
- if the projection row is available, the associated offsets are added to the antenna offsets (see next section) and used into the CLASS Data Format,
- if something else than projection is available, e.g. horizontalTrue, a specific support is not yet available in MRTCAL and an error is raised. However, if the associated offsets are (0,0)3.1, Mrtcal will tolerate this system of offsets. This is a temporary solution, waiting for a full support of all systems.