| chunk | A primar (resolved)chunk is composed of a set of touching but non-overlapping primary
segments (or parts of segments) which fills a
"chunk" of a stave, and is therefore bounded on
the east and west by lines of constant mu, and
north-south by lines of constant eta (if in the
North). Southern chunks have no eta boundary applied. A chunk may
also have a lambda cut if it is at the end of
the survey region for that stripe. Primary chunks do not overlap, so the union
of all existing chunks represents the unique sky coverage for the
survey at any given time. Note that
the bounds on chunks, if using mu/eta, are a mix of survey coordinates and great circle coordinates. Note:
The term chunk has sometimes been used to describe an area of sky that
has had tiling run on it. This is properly
called a TileRun. In general chunks contain overlapping areas which are
counted multiple times unless the primary or resolved area is indicated.
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