Erase polygon shapefile from another shapefile

MorganRSMorganRS Global Mapper UserPosts: 72Trusted User
Is it possible to preform an erase in Global Mapper using 2 shapefiles like you can in ARCMap?
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Best Answer

  • bmg_bobbmg_bob Global Mapper Programmer Posts: 1,762
    Answer ✓
    I have added feature request #17192 to our task list so we can evaluate adding this functionality to a future version of Global Mapper.  We will post a message on this thread when the status of the feature request changes.

Answers

  • bmg_bobbmg_bob Global Mapper Programmer Posts: 1,762
    edited December 2015
    What version of Global Mapper are you using?  Can you provide a more detailed description of what happens when you perform an erase in ArcMap, perhaps with before and after screen captures?   Thanks.
  • MorganRSMorganRS Global Mapper User Posts: 72Trusted User
    Using v.17 with the latest release.
    Here is an example of the before erase

    then I tile this shapefile out, and do the same with a bunch of other shapefiles and erase those tiles from the tiles that came from this tile.
    Here is the end result.

  • bmg_bobbmg_bob Global Mapper Programmer Posts: 1,762
    Is this different from using Crop to Selected Area(s), and checking the option to keep data outside the areas instead of inside?
  • MorganRSMorganRS Global Mapper User Posts: 72Trusted User
    It kind of works, but not really. I get a ton of "Invalid Polygon" errors when it runs into an island and doesn't create islands when it should
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