| http://www.w3.org/ns/prov#value | - At my place, the water surface is lowest in the middle of our lagoon and slightly higher (a few meters) closer to the shore...I am ranting here, but point being: the only good elevation data that you can get is either a local survey from your county land office or a dense elevation grid.Another point worth noting about GPS accuracy is that the figure reported by Garmin's units is an estimate, nothi
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