Global Mapper Pro

Combining Shapes

aaristar
aaristar Global Mapper User
edited January 2013 in Technical Support
I've loved the ability in the last few versions of GM to combine shapes into a single shape. But every so often this fails because something as decided that the shapes aren't contiguous. Now, to a human being they look like they touch exactly, so it's hard to figure out what is wrong so you can fix it. Are there any hints you can give me which might help in such a situation?

Comments

  • global_mapper
    global_mapper Administrator
    edited November 2010
    I would suggest drawing a patch area over the boundary of the two areas and including that in the join that way you will definitely have an overlap.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • paul.bade
    paul.bade Global Mapper User Trusted User
    edited April 2011
    If I would like to combine two areas, one of which has a hole, the part overlapping the hole gets deleted. Is that a bug?
  • global_mapper
    global_mapper Administrator
    edited April 2011
    Yes that is currently a limitation of the area combining, any island areas are completely retained if present and within the results.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • klmillis
    klmillis Global Mapper User Trusted User
    edited January 2013
    Mike,

    I'm curious if Paul's request can now be implemented. I'm trying to combing two vector files, one of which has islands in it. Any shape, that overlaps with an island in the other is discounted. That is the islands are retained. Is there a work around for this, e.g. a way to have the conventional areas supersede islands?

    Thanks,

    Keith
    Yes that is currently a limitation of the area combining, any island areas are completely retained if present and within the results.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • global_mapper
    global_mapper Administrator
    edited January 2013
    Keith,

    We have recently implemented support for using islands in polygon crop/combine operations, so that should work now, so long as both polygons are valid. I have placed a new build at http://www.bluemarblegeo.com/downloads/global-mapper/global_mapper14.zip with the latest changes for you to try. Simply download that file and extract the contents into your existing v14.xx installation folder to give it a try. If you are using the 64-bit v14 version there is a new build at http://www.bluemarblegeo.com/downloads/global-mapper/global_mapper14_64bit.zip .

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.bluemarblegeo.com/
  • klmillis
    klmillis Global Mapper User Trusted User
    edited January 2013
    Mike,

    I appreciate you putting this up. Using this new build however, I'm still encountering issues when combining the two area shapes. The shapes can be sent to you should they be needed to help describe the problem.

    1. Shapefile 01 is comprised of one area feature with many islands.
    2. Shapefile 02 is comprised of several area features with no islands.

    When the two are combined, if any portion of shapefile 02 overlaps an island, the entire area feature is dropped. If lines from shapefile 01 completely cut across an area in shapefile 02, only that portion that overlaps an island - after intersection - is dropped, with the remainder combining as expected.

    I have tried several permutations of COMBINE/CROP/"Find Intersection of selected features" to no avail.

    Any thoughts are appreciated.

    Thanks,

    Keith
  • global_mapper
    global_mapper Administrator
    edited January 2013
    Keith,

    I'll make up a data set and see if I can replicate what you are seeing.

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.bluemarblegeo.com/
  • global_mapper
    global_mapper Administrator
    edited January 2013
    Keith,

    Thank you for the sample files. I did find that our new join wasn't quite handling the islands right yet. I have fixed that and now your data seems to join beautifully! I have placed a new build at http://www.bluemarblegeo.com/downloads/global-mapper/global_mapper14.zip with the latest changes for you to try. Simply download that file and extract the contents into your existing v14.xx installation folder to give it a try. If you are using the 64-bit v14 version there is a new build at http://www.bluemarblegeo.com/downloads/global-mapper/global_mapper14_64bit.zip .

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.bluemarblegeo.com/
  • klmillis
    klmillis Global Mapper User Trusted User
    edited January 2013
    Mike,

    Perfect. This new build is precisely what was required.

    Thanks,

    Keith
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