[Geojson] [georss] [Geowanking] simple 3D geocode for AR

[Carl Reed]

Anselm -

Interesting comment WRT GML. GML is grounded in various ISO TC 211 documents, such as 19107 (spatial schema). GML is an XML grammar for encoding/modeling geospatial content and is not meant to be a rendering language. Anyway, GML supports the ability to define multiple CRS (including local/engineering) and the transforms/conversions associated with them. All GML CS and CRS elements are based on ISO 19111, spatial referencing by coordinates.

Regards

Carl

  ----- Original Message ----- 
  From: Anselm Hook 
  To: Chris Goad 
  Cc: geojson ; geowanking at geowanking.org ; Christian Willmes ; GeoRSS 
  Sent: Monday, August 31, 2009 8:47 PM
  Subject: Re: [georss] [Geowanking] [Geojson] simple 3D geocode for AR


  > Chris Goad writes : 
  > 3d modeling formalisms support this (and full GML does too), but  GeoRSS, GeoJSON, and KML do not. This is probably an argument for going to represententations  built for 3d in the first place for AR applications where local coordinates play a necessary role, but concievably there is a niche for our lightweight geo standards extended  by addition of a transformation node.

  I concur. It's convenient to have an idea of a local coordinate system. I've always been slightly surprised by how the GML community ignored the work of the VRML community. Convenience concepts such as transform nodes, multiple instancing of geometry and behavior nodes make expressing ideas more succinct.



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