Latitude / Longitude mapping

[Paul Harris]

if you wanted accuracy, you'd have to convert them to a planar mapping
(although I don't know which coord set would be appropriate to use?).
kdtree just uses euclidean distances, which doesn't match the distance on a
sphere.

you might be able to do something with UTM coords... except you will have to
deal with the zones somehow.

2008/8/8 Gerald Gutierrez <md1 at mogeso.com>

> Does anyone have experience with using kdtree's in a spherical mapping
> scenario? I need to batch geolocate a set of lats/longs to their closest
> cities (data from geonames.org) and am having trouble working out how I
> would map the lats/longs into 2D coordinates that make sense for a kdtree.
> Not certain whether the spherical nature of the Earth would affect anything.
> Would I simply use lat/long as the kdtree coordinates, or do I need to
> convert them into a planar mapping first?
>
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