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In Chris Gebhardts' article on obtaining Lat/Lon ....
This is a discussion on In Chris Gebhardts' article on obtaining Lat/Lon .... within the MapPoint 2006/2009 Discussion forums, part of the Map Forums category; In Chris Gebhardts' article on obtaining Lat/Lon from Mappoint he mentions that he makes the assumption that the earth is ...
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07-25-2001
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| Lat/Lon from Mappoint he mentions that he makes the assumption that the earth is a perfect sphere - just as the MP Distance function does. My question is: what kind of correction is needed to plot the derived Lat/Lon values on a map based on WGS83 datum. Thanks         |
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07-25-2001
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I think you are right that the Distance function assumes the earth is a perfect sphere, and there is probably a formula for correcting the results of Chris' lat/lon extraction code. However, when we tested the accuracy of the lat/lon values calculated (using MapInfo as the referee), the deviations were very minimal. Anything within a 1,000 mile range from the point the Distance was calculated from appeared to be within feet of the true location. Maybe the accuracy deteriorates the closer you get to the poles, but I guess that is not such a big issue for most of us. |
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