[Esip-documentation] ACDD geospatial_bounds

[John Graybeal via Esip-documentation]

Hi Bob,

Thank you for working on this so quickly. I find your text basically satisfactory (trusting you and other reviewers to sort out the OGC spec properly), and will put it in the table in the morning, with a few minor edits for consistency with other entries.

I ask we have the ability to specify a vertical CRS as well. 

Previously we proposed a separate attribute for that—how does geospatial_bounds_vertical_crs work for you? The definition would be 

The vertical coordinate reference system used by the coordinates in the geospatial_bounds attribute. EPSG CRSs are strongly recommended.  The default if unspecified is EPSG:4979 (height above the ellipsoid, in meters). Examples: "EPSG:5829" (instantaneous height above sea level) or "EPSG:5831" (instantaneous depth below sea level).

A corresponding adjustment to the geospatial_bounds definition would be needed. I can suggest wording if you approve in principal.

John

=======

On Oct 14, 2014, at 14:08, Bob Simons - NOAA Federal via Esip-documentation <esip-documentation at lists.esipfed.org> wrote:

> 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 
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> 
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