WCS Coverage Processing
(Much of this section started out from material written by Peter Baumann of the International University Bremen which I found on this page: http://galeon-wcs.jot.com/WikiHome/Implementation%20Progress%20Page/ , specifically here: http://galeon-wcs.jot.com/WikiHome/Implementation%20Progress%20Page/WCS-result-spec_v5.doc?cacheTime=1139909665610 )
The WCS GetCoverage request is composed from a set of six basic operations:
- domain (i.e., spatio-temporal) subsetting
- range (i.e., measure) subsetting
- resampling
- coordinate transformation
- data format encoding
- result file provision
Processing a GetCoverage request can conceptually be understood as executing the operation sequence shown in Fig. X; depending on the particular request, some steps may be skipped. While a concrete implementation may choose a different evaluation strategy it shall ensure that the result is identical to the one achieved by the sequence depicted in the following section.
Select Source Coverage
Convert request bounding box to native CRS of Coverage
Perform Spatial Sub-setting
Perform Temporal Sub-setting
Perform Range Sub-setting
Perform Spatial scaling into Request Bounding Box
- Includes interpolation as specified by client.
Perform projection into target CRS
- Includes interpolation as specified by client.
Perform Data Format Encoding
- May involve implicit range interpolation and, hence, accuracy loss, depending on format chosen.
