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Coverages FAQ

Frequently asked questions on coverages and coverage services. -- PeterBaumann - 30 Jun 2014

How to represent a 0-dimensional coverage?

Related issues: What happens when all the CRS dimensions get sliced in a WCS request? How to encode the GMLCOV description?

Answer: As per GMLCOV, the domain set of a coverage cannot have 0 dimensionality: the //gml:domainSet/@dimension attribute shall be greater or equal than 1. There is no clear guidance on 0-D in the OGC standards, The recommended solution is to represent such a coverage by the single (atomic or composite) range value in the range set and an empty empty domain set .

Example: See the rasdaman WCS test oracle for 0-dimensional output rectified grids: browser:systemtest/testcases_services/test_wcs/oracle/
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Topic revision: r1 - 30 Jun 2014, PeterBaumann

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