Dear All,
I am desperately trying to fasten my algorithm to estimate the fraction of
tree crown that overlap a given 10x10 subplot in a forest plot. I have
combined a set of spatial functions (gDistance, extract) & objects
(SpatialGrid, SpatialPolygons) in a way that is probably not the most
effi
Ervan,
Just on the run, especially if you deal with real data and some 100K
-1000K of vectors I think the fastest way to do so is to engage GDAL
GRASS7/SAGA and their ability to deal highly efficient with this kind
of topological and geometrical queries.
A very good pure R alternative is to
Dear Chris,
Thanks for your prompt reply and pointing out the "sf" package . I wasn't
aware of it, but I am glad to see it has been released only 2 weeks ago ;)
I'll have a look right now.
Tschüss
Ervan
On 20 February 2017 at 10:56, Chris Reudenbach
wrote:
> Ervan,
>
> Just on the run, especia
The biggest bottleneck was creating a SpatialPolygons object and
calculating gDistance. After computing the SP object outside the for loop,
the run time came down dramatically (see SO post).
Cheers,
Roman
On Mon, Feb 20, 2017 at 10:56 AM, Chris Reudenbach <
reudenb...@uni-marburg.de> wrote:
> Er
I generally use postgis for this sort of thing.
THK
http://www.keittlab.org/
On Mon, Feb 20, 2017 at 2:45 AM, Ervan Rutishauser wrote:
> Dear All,
>
> I am desperately trying to fasten my algorithm to estimate the fraction of
> tree crown that overlap a given 10x10 subplot in a forest plot. I
