On 6/22/17 1:39 PM, Markus Neteler wrote:
On Jun 22, 2017 11:43 AM, "Markus Metz"
> > On 21/06/17 23:12, Markus Neteler wrote:
> >>
....
> >> Checking further, I found a personal wish email to MartinL from 2009.
> >> AFAIR I was dealing with LiDAR point clouds of the Trentino back
> >> then... and needed to know the average distance between points
>
> Did you really want to average distance to all other points or
rather the average distance to the nearest other point?
Indeed the latter...
> >> in
> >> order to optimize raster binning (meanwhile I would probably use
> >> r.in.xyz <http://r.in.xyz> and count the points falling into each
raster cell, then
> >> r.univar on the resulting map).
> >>
> >> However, to have the possibility to compute statistics on the
> >> distances between vector (point) geometries makes sense to me in a
> >> GIS.
> >
> >
> > Would this possibly be better done within v.distance ? Something
like a -s flag meaning "Output summary statistics of desired
information" which would take the info chosen in upload=, and possibly
the -a flag and calculated summary statistics ?
>
> v.distance uses the distance to the nearest feature while v.univar
uses all distances to all other features. While v.distance makes sense
to me, v.univar's distances to all other features do not make sense to
me.
Both could be useful. For example, when looking at dispersal distances
to seed sources in a landscape you may be interested in the nearest
neighbors, but also all available seed sources in a landscape.
I agree.
markusN
_______________________________________________
grass-dev mailing list
[email protected]
https://lists.osgeo.org/mailman/listinfo/grass-dev
_______________________________________________
grass-dev mailing list
[email protected]
https://lists.osgeo.org/mailman/listinfo/grass-dev
