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technologies:geodata_concepts:crs:crs_orbit [2012/04/18 07:58] jeroen.vermeulen@orbitgis.com [Supported CRS] |
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- | ===== Coordinate Reference Systems in Orbit ====== | ||
- | This page describes only the use and application of Coordinate Reference Systems in Orbit. \\ | ||
- | For clear and short overview of the concepts of coordinate systems, datum and projections, | ||
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- | ===== Supported CRS ===== | ||
- | |||
- | Orbit has the objective to support all coordinate system as they are described in the [[http:// | ||
- | \\ \\ | ||
- | Additionally the following coordinate systems in Great Britain described by the [[http:// | ||
- | * [[technologies: | ||
- | * [[technologies: | ||
- | * [[technologies: | ||
- | |||
- | {{: | ||
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- | ===== Dataset CRS ===== | ||
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- | A coordinate reference system (CRS) or spatial reference system (SRS) is a coordinate-based local, regional or global system used to locate geographical entities. A coordinate reference system defines a specific map projection, as well as transformations between different spatial reference systems. \\ | ||
- | Coordinate reference systems can be referred to using a SRID integer, including EPSG codes defined by the International Association of Oil and Gas Producers. | ||
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- | There are two ways to set the CRS of a dataset in Orbit : | ||
- | * [[orbitgis: | ||
- | * [[orbitgis: | ||
- | The dataset CRS is saved in the Orbit Resource Descriptor file : | ||
- | * [[technologies: | ||
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- | ===== MapCanvas CRS ====== | ||
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- | Set the CRS of the MapCanavs using statusbar : | ||
- | * [[orbitgis: | ||
- | The MapCanvas CRS can be saved in the workspace file : | ||
- | * [[orbitgis: | ||
- | ===== Custom CRS Definitions ===== | ||
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- | The EPSG dataset does not and cannot record all possible geodetic parameters in use around the world. Orbit GIS supports custom created CRS definitions if they are structured as well)known-text as described by the Open Geospatial Consortium : | ||
- | * International documentation : [[http:// | ||
- | * Practical documentation for use in Orbit : [[technologies: | ||
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- | ==== How to add custom CRS definition ==== | ||
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- | - Create a plain ASCII text file with the extension .prj and insert the projection parameters as a WKT (well known text) definition on a single line | ||
- | - The prj-file | ||
- | - The name of the file should be a numeric code, like " | ||
- | - After starting OrbitGIS the new CRS systems can be found by selecting " |
Last modified:: 2012/04/18 07:58