Talk:gml

From GeoRSS

EPSG

In the Section "Stateplane CRS example" the correctly stated EPSG Code is 26986. According to the EPSG Registry this is for a Projected Coordinate System based on NAD 1983 for the Massachusetts Mainland. This Projected Coordinate System uses Eastings and Northings in metres. I suggest that the example "<gml:Polygon srsName="urn:ogc:def:crs:EPSG:6.6:26986"><gml:posList> 45.256 -110.45 46.46 -109.48 43.84 -109.86 45.256 -110.45</gml:posList> are using Decimal Degrees and not Metres.

Coordinate Reference Systems for off-world places

The geo: URI scheme (RFC 5870) allows for the specification of Coordinate Reference Systems for non-terrestrial bodes such as the Moon or Mars. This is also proposed (by me) as an extension to the Geo microformat.

GML, too, should allow for such Coordinate Reference Systems (consider, for example, a feed of meteorite impact sites on the Moon, or of the progress of the Opportunity rover on Mars), maintaining compatibility and thus interoperability with the above specifications. Andy Mabbett (User:Pigsonthewing); Andy's talk; Andy's edits 13:36, 18 May 2011 (UTC)