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Len -
Interesting comment. You might be interested in two presentations being given at the next OGC meetings (This month, NYC). One is on CityGML, a 3d GML application schema for city models. The other is for the interface to a portrayal service for 3D visualization called Web 3D Service (W3DS). It explicitly addresses medium client environments, which allow users to interactively navigate through virtual 3D worlds. Both capabilities and the related candidate OGC standards were developed by NorthRhine Westphalia in Germany. While these may not be light-weight enough for some emergency applications, the move into 3D and near real time portrayal using standard interfaces is extremely positive for that market space.
Regards
Carl
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