Dissolving donuts with polygons
Hi,
I have some rough shapes (donuts, polygons) that I am trying to dissolve together.
I've tried the donut builder tip here https://knowledge.safe.com/questions/4487/dissolver-failure.html but the dissolving still doesn't work and produces the wrong output
Hi @claudian, in my experiences, it's sure that there are cases where the Dissolver couldn't work as expected when many input areas (not only donuts) overlaps and there are tiny gaps between their boundaries. Depending on the data condition, the Snapper (Snapping Type: Segment Snapping) could be a workaround to resolve the gaps and then make the subsequent Dissolver work fine. However, it could also take a long time to perform the snapping process. It requires trial and error with the actual dataset.
Hope this helps.
This is a follow up question so I'm not sure if it warrants it's own post.
But the Clipper isn't working for me when I clip (the not so clean) polygons.
I've attached the macro and output screenshots below as well as the macro itself.
I've tried the following based on other posts: ArcStroker, Snapper, CoordinateRounder.
But none of the above seem to work, do you have any tips on how to make the clipper work?
I'm avoiding the GeometryValidator because I found a scenario where a fixed polygon was incorrect.
Yellow = Input
Green = Clipped
Circled = Should be clipped...
Hey @courtney_m and all
Your above output is what I'm after, but my input shapes are more complex/dirty which is where I think the issue is.
I've attached a zip file that contains my macro + sample data (the actual input is much larger so am aiming to avoid manual cleaning).
Thankyou + appreciate any help!
Hi, @claudian. Can you please attach some sample data? I created 1 donut and 2 polygons using FME, then I sent all 3 through the Dissolver, and the output looks the way I would expect it to. Please look at the screenshots below and let me know if the output is not what you would want?
Here are my 3 original shapes. The donut is selected so you can see that the fme_geometry = fme_donut.
This is what it looks like after going through the Dissolver:
