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I'm trying to find out if there are scientifically accepted calibration points to measure the effectiveness of a geodetic distance finding function. So far I've been using the listed latitude / longitude coordinates of various airports but I'm not sure where exactly in the airports they're measuring (the control towers?) and its hard to judge my error rate with that unknown.

I thought it might be better if there were points that were a known distance apart - such as where the Prime Meridian crosses Greenwich or the compass rose at the Hoover Dam?

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    If it’s open data that you seek then I think the place to ask is the Open Data Stack Exchange. – PolyGeo Aug 31 at 23:11

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