Changes between Version 4 and Version 5 of markhDataModelDraft


Ignore:
Timestamp:
02/17/14 06:56:16 (5 years ago)
Author:
markh
Comment:

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  • markhDataModelDraft

    v4 v5  
    66Geo-location in the third dimension of space, the vertical, is only provided with respect to the datum of the coordinate reference system.
    77
    8 A coordinate instance may reference one coordinate reference system, the coordinate is defined with respect to this referenced CRS.
     8A coordinate instance may reference one coordinate reference system, the coordinate is then defined with respect to this referenced CRS.
    99
    1010[http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/apf.html Appendix F] of the CF conventions for NetCDF files lists coordinate reference systems which may be defined using the controlled terminology name '''grid_mapping_name'''. The properties which are recognised for each of the coordinate reference systems are listed there.
    1111
    1212The OGC Well Known Text (WKT) string is also supported within CF and may be used complementarily to entries in Appendix F to define a coordinate reference system.   The attribute '''crs_wkt''' must be used for WKT strings.  All uses of the '''crs_wkt''' attribute must be well formed well known text strings.
     13
     14In CF NetCDF files coordinate reference systems are defined by the data variable, using the `grid_mapping` attribute.  Where the `grid_mapping` attribute does not define explicit references between coordinates and a CRS, there exists and implicit reference from the X and Y coordinate variables to the `grid_mapping` target variable.
    1315
    1416=== Derived Coordinate ===