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  1. #1
    Global Mapper User
    Join Date
    Jun 2009
    Location
    Wellington, New Zealand
    Posts
    394

    Default Mercator settings from .PRJ

    Mike,

    I shouldn't really call this a bug, since .PRJ files are inevitably approximate.

    The issue is that for Mercator projections, GM 12.01 (and previous versions) overlooks the True Scale Latitude parameter written in a PRJ file (for some reason) as standard_parallel_1. It always defaults to 0.

    This is the case even for .PRJ files GM has written itself.

  2. #2
    Administrator
    Join Date
    Jun 2007
    Posts
    16,451

    Default

    I would expect GM to write the true scale latitude to a parameter named 'latitude_of_origin' (seems to be the standard one used although really seems like the wrong one). In any case, I have updated the PRJ importer to recognize 'standard_parallel_1' for the True Scale Latitude parameter. I have placed a new build at http://www.globalmapper.com/global_mapper12.zip with the change for you to try. Simply download that file and extract the contents into your existing v12.xx installation folder to give it a try. If you are using the 64-bit v12 version there is a new build at http://www.globalmapper.com/global_mapper12_64bit.zip .

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com

  3. #3
    Global Mapper User
    Join Date
    Jun 2009
    Location
    Wellington, New Zealand
    Posts
    394

    Default

    Mike,

    For the files we were having difficulty with, the true scale latitude is now recognised effortlessly and correctly.

    Thank you very much.

    Tim

 

 

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