[QGIS-Developer] Geodesic Line Simplification

[C Hamilton]

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.gergely at 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 <adenaculture at 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
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> —
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>
> *Tim Sutton*
>
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