I am guessing this is working on Cartesian coordinates and not geodesic which is fine if you have a local projection. I think I will go ahead and implement some similar geodesic algorithms. Thank you for the GRASS link. It will help.
Thanks, Calvin On Tue, Oct 1, 2019 at 7:45 AM Áron Gergely <aron.gerg...@rasterra.nl> wrote: > Hi Calvin and list, > > Have you looked at the GRASS GIS v.generalize tool? > https://grass.osgeo.org/grass64/manuals/v.generalize.html > > The Douglas-Peucker algorithm is implemented there and I have used that > with (topologic)success recently on many touching polygons. Should work for > polylines too! > > Best regards, > Aron > > On 01/10/2019 08:19, Tim Sutton wrote: > > Hi > > On 26 Sep 2019, at 17:13, C Hamilton <adenacult...@gmail.com> wrote: > > Are there any geodesic QGIS algorithms that simplify lines? "Simplify" > just uses the projection units of measure. If there isn't I thought I would > add this to the Shape Tools plugin. I could easily implement the > Douglas-Peucker algorithm using geodesic math. > > For GPS tracks I also see a need to throw out all points that are less > than a certain distance or less than a certain time interval. I don't see > any simplification algorithms that make use of time. Am I just missing them? > > > No I don’t think we have any time based simplifiers - would be a great > addition! > > Regards > > Tim > > > > > Thanks, > > Calvin > _______________________________________________ > QGIS-Developer mailing list > qgis-develo...@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > > — > > > > > > > > > *Tim Sutton* > > *Co-founder:* Kartoza > *Ex Project chair:* QGIS.org > > Visit http://kartoza.com to find out about open source: > > Desktop GIS programming services > Geospatial web development > GIS Training > Consulting Services > > *Skype*: timlinux > *IRC:* timlinux on #qgis at freenode.net > > I'd love to connect. Here's my calendar link > <https://calendly.com/timlinux> to make finding time easy. > > > _______________________________________________ > QGIS-Developer mailing listqgis-develo...@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > >
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