Is there a QGIS plugin or other method that simplifies parcels to share a common line(border)? I'm pretty sure I read about this some time ago. Couldn't find anything here or elsewhere.

I'd like to reduce a parcel shapefile in size to be rendered as a WMS via GeoServer.

If someone could point me in the right direction I'd appreciate it

I'm using: PostGIS 1.5 GeoServer 2.3 QGIS master(dev) Leaflet 0.6.4

  • So simplify but keep the topology intact? Or is the topology already messed up?
    – underdark
    Oct 22 '13 at 17:37
  • I did run some simplify geometries from a tolerance of 0.0001 to 0.1000 which didn't reduce the file size by much. Does simplify just remove vertices only?
    – geomajor56
    Oct 22 '13 at 19:20
  • 0.1000 meters or degrees? Yes, simple algorithms like Douglas-Peucker only remove vertices.
    – underdark
    Oct 22 '13 at 19:27
  • details, details. Guess that would make a difference. They're in degrees. But the topology seems to be fairly tight as they've been edited to conform to a standard. Is it possible convert to TopoJSON and then upload to PostGIS 1.5?
    – geomajor56
    Oct 22 '13 at 19:40

So, for me, the solution would be to upgrade PostGIS, import the shapefile in PostgreSQL/PostGIS, clean it and create a topology, and serve the resulting layer with GeoServer.

  • thank you for the info. Very helpful, I didn't know any of that.
    – geomajor56
    Oct 22 '13 at 20:07

This might be an interesting rabbit hole to run down:


Here are some blurbs: Difference between GeoJSON and TopoJSON and How is TopoJSON different than GeoJSON

And possible real-world usability. If you can convert from TopoJSON to GeoJSON, then you could convert from GeoJSON into PostGIS.

All this being said that I have not used either TopoJSON or GeoJSON very much, and not at all in PostGIS. But, it was the first thing that came to mind when I read your question.

  • Also, I do not know how TopoJSON compares to topology built into PostGIS.
    – Barrett
    Oct 22 '13 at 17:59

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