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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.
Gildas manager
2023-06-01