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Produce watertight polygonal vector maps by tracing raster images

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This solves issue #6 I'm unsure what knock-on effects using label `0` has, but it made some failing cases produce useful output and I hope it helps someone else

At least that is my hypothesis. Using the attached derived from some height data of mt st helens I experience the output: ``` python maptrace.py -S -y -c ../new30-binned-screenshot.png (576,...

Glad to see that last update was a few months back and the project is not completely dead. I am having an issue replicating the pa-counties.svg from the examples provided...

Hi, This looks quite impressive but I can't seem to be able to get it to work for any image other than your examples. [Parts.90_boundaries_outer.zip](https://github.com/mzucker/maptrace/files/3124701/Parts.90_boundaries_outer.zip). For the cases where it...

Abstracted a new class MapTrace so MapTrace can be called as a module from other python apps. Will soon add a method to retrieve raw SVG instead of writing to...