a 2-D not 3-D WGS84 is the default for GeoRSS, but there is also an
elev attribute whose default is number of meters above geoid (e.g. GPS
elevation). For an imprecise geoannotation, height relative to terrain
would probably be more useful (georss:floor but that is in units of
building floors). A perspective might also be important (not currently
defined in GeoRSS) if the geoannotation has been applied to one side
of a vertical feature.
On Aug 27, 2009, at 7:35 PM, Mike Liebhold wrote:
A friend wrote me with a request for clarification on a topic we've
discussed many times here, but every time we've approached a
consensus the answer seems elusive.
Many devleopers are starting to create applications for iPhones and
Android phones to view location specific data through the
viewfinder using the -imprecise- capabilities of the built in gps
and compass and applications platforms like Layar.
The question:
What is the -simplest- way to geocode a geoannotation in 3D using
geoRSS/Atom, geojson, KML ....?
(Is there a practical reason why WGS '84 shouldn't be implicit, and
a CRS lookup NOT be required?)
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