c# - Converting GPS coordinates into 3D model -

as question says, looking use gps coordinates (say google maps) build 3d model (a road).

so should work follows: go google maps , select route (this can between 2 points or circuit). lat long coordinates route.

using data, feed program generates height map of coordinates obtained google maps.

i trying make demo in c# (xna) can generate course of neighbourhood driving sim (as long main road sections right ok, wont able add detailed characteristics of road e.g. ditch next road or small bumps in actual road surface).

does have ideas on start problem (tried google best find here)

gps coordinates (latitude, longitude, altitude) uses speherical 3d modell. want transformation cartesian 3d model.

for case can convert them ecef coordinates, x,y,z coordinates

for ecef overview see ecef