I am trying to implement line simplification on a polyline dataset using SimpliPy in QGIS but there is not an option for the output dataset. There are two notes mentioned in the plugins repository ( https://plugins.qgis.org/plugins/simplipy/ ): - You must have installed Shapely 1.2.18 or you will get an error installing or using this plugin. - The output can only be saved to a "New layer" for now. (The Output:Field isn't working).

Can anyone help me with that?


I'm the author of the plugin:

The "output field" section was an option that appeared in versions < 0.30 but was never implemented and removed in 0.31. If you update the plugin version to the latest one you will see it's not there (I removed it basically because I didn't have time to manage how to make it work).

About LineStrings simplification: You are right, it's not implemented. Since it's very similar to simplifying polygons I will include it in the next version of the plugin.

  • I've released a new version of SimpliPy (0.40) which now supports LineString and MultiLineStrings. – AlbertFerras Dec 8 '15 at 11:31
  • Thanks a lot Albert. I would like to ask you two questions: 1. Do I need to run the plugin and then Save As the output file? 2. Can I see the execution time of the operation? – Vasilis Kaloyirou Dec 14 '15 at 1:01
  • @VasilisKaloyirou 1. Yes, you will need to use QGIS exporting tools to export the new SimplipY X layer. 2. In the current version you can't see it, but I'll include it on the next update. – AlbertFerras Dec 17 '15 at 15:27

Well, I tried the plugin but it seems like it does not support lines

Not supported geometry type: LineString

It works fine with polygons though (just click Start and it adds a layer with the simplification output as shown in the following screenshot)

enter image description here

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