<div dir="ltr"><div>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.</div><div><br></div><div>Thanks,</div><div><br></div><div>Calvin<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 1, 2019 at 7:45 AM Áron Gergely <<a href="mailto:aron.gergely@rasterra.nl">aron.gergely@rasterra.nl</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
Hi Calvin and list, <br>
<br>
Have you looked at the GRASS GIS v.generalize tool?
<a href="https://grass.osgeo.org/grass64/manuals/v.generalize.html" target="_blank">https://grass.osgeo.org/grass64/manuals/v.generalize.html</a><br>
<br>
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!<br>
<br>
Best regards,<br>
Aron<br>
<br>
<div>On 01/10/2019 08:19, Tim Sutton wrote:<br>
</div>
<blockquote type="cite">
Hi<br>
<div><br>
<blockquote type="cite">
<div>On 26 Sep 2019, at 17:13, C Hamilton <<a href="mailto:adenaculture@gmail.com" target="_blank">adenaculture@gmail.com</a>>
wrote:</div>
<br>
<div>
<div dir="ltr">
<div>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. <br>
</div>
<div><br>
</div>
<div>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?</div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>No I don’t think we have any time based simplifiers - would
be a great addition!</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Tim</div>
<div><br>
</div>
<div><br>
</div>
<br>
<blockquote type="cite">
<div>
<div dir="ltr">
<div><br>
</div>
<div>Thanks,</div>
<div><br>
</div>
<div>Calvin<br>
</div>
</div>
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calendar link</a><span> to make finding
time easy.</span></div>
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