Definition of terms

The meaning of words sometime depend on the community using them. The Apache SIS library prefers as much as possible to use terms in the sense of OGC and ISO standards. Particular care must be taken with the interfaces between SIS and certain other external libraries. For example, the ISO 19123 standard see CV_Coverage as functions in which the domain is the set of spatio-temporal coordinates encompassed by the data, and the range is the set of values encompassed. However, UCAR’s netCDF library applies these terms instead to the function for converting pixel indices (its domain) to spatial-temporal coordinates (its range). Thus the UCAR library’s range may be the domain of ISO 19123.

Coverage
Feature that acts as a function to return values from its range for any direct position within its spatial, temporal or spatiotemporal domain. ISO 19123
Coordinate
One of a sequence of numbers designating the position of a point. ISO 19111
Coordinate operation
Process using a mathematical model, based on a one-to-one relationship, that changes coordinates in a source coordinate reference system to coordinates in a target coordinate reference system, or that changes coordinates at a source coordinate epoch to coordinates at a target coordinate epoch within the same coordinate reference system. ISO 19111
Coordinate reference system
Coordinate system that is related to an object by a datum. ISO 19111
Coordinate system
Set of mathematical rules for specifying how coordinates are to be assigned to points. ISO 19111
Coordinate tuple
Tuple composed of coordinates. The number of coordinates in the coordinate tuple equals the dimension of the coordinate system. The order of coordinates in the coordinate tuple is identical to the order of the axes of the coordinate system. ISO 19111
Datum
Parameter or set of parameters that realize the position of the origin, the scale, and the orientation of a coordinate system. ISO 19111
Domain
Well-defined set. ISO 19123
Range
Set of feature attribute values associated by a function with the elements of the domain of a coverage. ISO 19123