[Esip-documentation] Geospatial Bounds

[Armstrong, Edward M (398M) via Esip-documentation]

CF has an attribute grid_mapping that can be used to specify the projection and thus the coordinate system.

But I think we are trying to over define geospatial bounds that are probably approximate anyway.



On Sep 22, 2014, at 3:25 PM, Ted Habermann via Esip-documentation <esip-documentation at lists.esipfed.org<mailto:esip-documentation at lists.esipfed.org>> wrote:

Dave et al.,

I think this is an interesting step forward... The definition should say something about the CRS as the order of the coordinates in the WKT actually depends on the CRS (I think). There is a great discussion of this on the ESIP wiki (of all places) by Roger Lott: http://wiki.esipfed.org/index.php/CRS_Specification. Also, if the definition is going to include an example, lets use numbers that are unambiguously longitude (i.e. > 90). Also may want to mention the overlap between the first and last points... and a url to more complete documentation of WKT...

Ted


On Sep 22, 2014, at 4:16 PM, David Neufeld - NOAA Affiliate via Esip-documentation <esip-documentation at lists.esipfed.org<mailto:esip-documentation at lists.esipfed.org>> wrote:

Hi All,

Based on some off list discussion, here is a new proposed definition for

geospatial_bounds:

Describes geospatial extent using geometric objects (2D or 3D) defined by the Well-Known Text (WKT) format.  geospatial_bounds values are always longitude (decimal degrees_east), latitude (decimal degrees_north), and optionally altitude (meters, up).  Like the  geospatial_lon/lat_min/max attributes, these may be approximate values.  Example: POLYGON ((-71.29 40.26, -70.79 41.26, -70.29 41.26, -70.79 40.26, -71.29 40.26))

-Dave

_______________________________________________
Esip-documentation mailing list
Esip-documentation at lists.esipfed.org<mailto:Esip-documentation at lists.esipfed.org>
http://www.lists.esipfed.org/mailman/listinfo/esip-documentation

<SignatureSm.png>

_______________________________________________
Esip-documentation mailing list
Esip-documentation at lists.esipfed.org<mailto:Esip-documentation at lists.esipfed.org>
http://www.lists.esipfed.org/mailman/listinfo/esip-documentation

-ed

Ed Armstrong
JPL Physical Oceanography DAAC
818 519-7607



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.lists.esipfed.org/pipermail/esip-documentation/attachments/20140922/ee19c19e/attachment.html>