WCPS-Tutorial / Overview
The Web Coverage Processing Service (WCPS; specification) supports retrieval and processing of geospatial coverage data. WCPS grounds on the coverage model of the OGC Web Coverage Service (WCS) Interface Specification where coverages are defined as digital geospatial information representing space-varying phenomena, currently constrained to equally spaced grids. In the sequel, some familiarity with WCS is assumed.
WCPS provides access to original or derived sets of geospatial coverage information, in forms that are useful for client-side rendering, input into scientific models, and other client applications. As such, WCPS includes WCS functionality and extends it with an expression language to form requests of arbitrary complexity allowing, e.g., multi-valued coverage results. This language is explained in this tutorial; the Abstract Syntax sandbox allows for issuing WCPS requests against a sample database.