In the sep16a
CLASS release, the internal code of the
XY_MAP command was refurbished to ensure that datasets larger
than the available RAM memory can be processed by slicing the data
in intervals of channels. The command is now also able to read
direct or transposed input XY tables and/or to write direct (LMV) or
transposed (VLM) output cubes. The latter feature is useful to
easily reimport data when a 2nd step of baselining is desired on the
gridded data cube. The online help was upgradeed accordingly (see in
particular the output of
LAS> HELP XY_MAP MEMORY).
This memo describes how the gridding is performed in CLASS, from
the collection of spectra to the spectral cube. It focuses on the
file access efficiency, memory consumption, and how the user choices
can
impact them.
Commands: TABLE, XY_MAP, TRANSPOSE
Keywords: gridding, transposition, memory, large files
Related documents: CLASS documentation