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| Google's digital elevation model comes from NASA's shuttle radar topology mission:
http://www2.jpl.nasa.gov/srtm/
They estimate the maximum vertical error to be around 9meters (30ft). It's interesting to note that the data has a post spacing of about 100ft, meaning they only take an elevation reading once every hundred feet.. so if your property has a lot of hills on it, the elevation data is probably less accurate than if it is nice and flat.
If you have problems converting the KML to shapefile let me know, I'd be glad to convert it for you using GlobalMapper:
http://www.globalmapper.com/ | |
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Google earth elevations
