In the context of fisheries data, geographic coordinates will consist of pairs of (x,y) numerical values handled in the spatial reference system considered (refer spatial reference system). If needed, these pairs may be extended to include a third dimension with...
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Geographic coordinates WKT format
In Method 3 above, the recommended format for handling coordinates is the OGC Well-Known-Text format (WKT). Whatever the geometric shape, WKT provides a simple string representation of the geometry. In that way, a single column is...
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Use of geographic classification/coding systems
Alternatively, a dataset may be geo-referenced using a reference geographic classification and coding system (e.g. FAO Major area codes, grid cell codes).
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Use of Degrees-Minutes-Seconds (DMS)
In the case of handling geographic coordinates in official reports and publications, the geographic coordinates can be enumerated using the Degrees-Minutes-Seconds (DMS) notation. This notation is generally used in the legal context where the DMS appears to...
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Geographic classification systems
A geographic classification system can be defined as a way of grouping and organizing geographic references (reference points, lines or areas) to be used as reference data for geo-referencing statistical datasets. To facilitate its use, a geographic classification...
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Irregular area classification systems: Systems where the elements correspond to irregular areas. e.g. Countries or areas FAO Major Fishing Areas for Statistical Purposes Exclusive Economic Zones Regional Fishery Bodies Competence areas Reporting areas, Fishing zones. ...
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Grid classification systems: System defined by a regular geo-referenced grid characterized by a maximum geographic extent or scale (global, regional, local) a grid unit/cell shape (e.g. square, rectangle) a grid resolution (e.g. 1 x 1degree, 5 x 5...
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Linear classification systems: System defined by elements characterized by a linear shape, e.g. haul trajectory.
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Locations: System defined by elements characterized by points (locations), e.g. landing site.
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Geographic coding systems
Geographic coding systems are recommended to facilitate the use of geographic classification systems and the geo-referencing of fisheries statistics. A geographic coding system consists in identifying each element of the classification with a unique, permanent and meaningful code...
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