[Esip-documentation] ACDD geospatial_bounds

[Bob Simons - NOAA Federal via Esip-documentation]

For geospatial_bounds_crs, how about:
The Coordinate Reference System used by the coordinates in the WKT in 
the geospatial_bounds attribute.  EPSG CRS's are strongly recommended. 
Examples: EPSG:4326 (the 2D WGS84 CRS) and EPSG:4979 (the 3D WGS84 CRS). 
If this attribute is not specified, the CRS is assumed to be EPSG:4326.

For geospatial_bounds, how about:
Describes the data's 2D or 3D geospatial extent in OGC's Well-Known Text 
(WKT) Geometry format.  (See the specification in the OGC Simple Feature 
Access (SFA) document at http://www.opengeospatial.org/standards/sfa .) 
As in the WKT specification, the meaning and order of values for each 
coordinate point is dependent on the CRS, which in ACDD is assumed to be 
EPSG:4326 unless otherwise specified with geospatial_bounds_crs. For 
example, EPSG:4326 coordinate values are latitude (decimal 
degrees_north) and longitude (decimal degrees_east), in that order (see 
http://www.epsg-registry.org/export.htm?wkt=urn:ogc:def:crs:EPSG::4326). 
The values may be approximate. Note that longitude values in EPSG:4326 
and EPSG:4979 are not restricted to the [-180, 180] range only. Example 
using EPSG:4326: POLYGON ((40.26 -111.29, 41.26 -111.29, 41.26 -110.29, 
40.26 -110.29, 40.26 -111.29))

I don't feel that I'm an expert with OGC standards. I'm open to 
suggestions/corrections.

-- 
Sincerely,

Bob Simons
IT Specialist
Environmental Research Division
NOAA Southwest Fisheries Science Center
99 Pacific St, Suite 255A
Monterey, CA 93940
Phone: (831)333-9878 (Changed 2014-08-20)
Fax: (831)648-8440
Email: bob.simons at noaa.gov

The contents of this message are mine personally and
do not necessarily reflect any position of the
Government or the National Oceanic and Atmospheric
Administration.
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