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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