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| Why are the results different when converting from NAD83 to NAD27 using Didger and Global Mapper? |
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There's more than one way to convert between NAD83 and NAD27, and unfortunately the results differ depending on the method used.
Didger uses 3-parameter Molodensky (delta x,y,z,ellipsoid) to convert from NAD83 to NAD27. Based on the numbers in our test cases, it looks like Global Mapper is not using the same 3-parameter conversion, but rather it is using an inverse NADCON method to convert from NAD83 to NAD27. Our software doesn't currently support this method.
If you would like to add your vote to this request on the Didger suggestion file, please email didgersupport@goldensoftware.com.
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