problem combining polygons

I had a circular polygon that I split, then added terrain data to each half. However, when I tried to combine the two halves, one disappeared. I checked for invalid areas, but there weren't any. Any idea why one half would disappear upon combining?
Polygons before combining:
Checking for invalid areas:
After combining:
Answers
-
Hi JSL,
I can reproduce what you're seeing. It's a bit of a mystery, as the two polygons do indeed intersect at their boundaries, so they should combine correctly. Unfortunately, I can see that when we combine them internally, no result is generated, so we keep the original area feature and move on, which is what you're seeing.
I'm not sure what version of Global Mapper that you're using, but it must be relatively recent. If so, you should see a "Use legacy method" checkbox on the "Select Combine Options" dialog. This uses the original Combine code, which we replaced with a much faster implementation, but kept around for situations like this. When I checked "Use legacy method", the polygons combine as expected.
In the meantime, I created a new issue (GM-14338), so we can take a closer look.
Thanks for reporting this.
~Jeff
-
Sorry, the issue is actually GM-15080, just for the record.
~Jeff
Categories
- 12.4K All Categories
- 5.4K Features Discussion
- 314 Downloading Imagery
- 1.3K Elevation Data
- 377 Georeferencing Imagery Discussion
- 603 GM Script Language
- 49 User Scripts
- 112 GPS Features
- 394 Projection Questions
- 800 Raster Data
- 1.3K Vector Data
- 6.5K Support
- 161 Announcement and News
- 890 Bug Report
- 556 SDK
- 1.2K Suggestion Box
- 3.7K Technical Support
- 537 Other Discussion
- 128 GIS Data Sources
- 26 Global Mapper Showcase
- 224 How I use Global Mapper
- 104 Global Mapper Forum Website