[Reference and Helper Services] CRS Catalog and Conversion
Objective:
- The main goals of the Spatial Reference Catalog service are to offer
- Coordinate Reference Systems (CRSs) to enable end-users to make a CRS selection.
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- Search for CRSs given a number of constraints.
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- Download of the entire catalog for local caching and when the cache has to be refreshed.
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- Access to various sub-sets of the catalog.
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- Once a CRS is found, produce a persistable reference to be stored with the data, which fully describes the CRS; this persistable reference string becomes catalog independent. This means any consumer will be able to understand the CRS definition even if a different catalog is used in the future context.
- More details captured here
- The main goals of the conversion service is to provide spatial reference conversions for coordinates.
- Coordinates are represented by an array of 3D points.
- The measurement and unit associated with the axes, is given by the CRS definitions.
- In most of the cases, the CRS definition is 2D.
- In both the geographic and projected CRS types, the Z-axis is passed through unchanged, and its unit is only known to the client.
- More details captured here