Subsetting: how to cut out parts from a
Frequently one does not want to download the whole coverage, but only part of it.
Such a subset always
is a coverage again, and actually keeps all other characteristics unchanged.
Actually there are two different variants of subsetting:
- domain subsetting
reduces a coverage's domain, ie, its extent.
A typical use case is applying a bounding box selection.
- range subsetting
extracts, for each coverage cell, some of its
components. A typical use case is selecting bands from satellite images.
- Notice the WCS coverage model notation: a coverage is seen as a function mapping
points in some
(spatial, temporal, or abstract) domain into some value set, the function's