Murray Richardson utoronto.ca> writes:
>
> It would be great to have CGAL bindings in R.
>
Agreed. This is something I've been contemplating as well.
THK
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I am not calling CGAL from R yet - currently I am just using dumping x y
points from R to alpha shapes in a loosely coupled fashion and then
reading the results back into R and into a postGIS database. The alpha
shapes is a "concave" hull routine. I need to call the cgal C++ code
from R and w
Hi Roger et. al.!
Again, let me start by thanking the Spatial R group for almost 2 years of
fantastic help in my research. I am currently working on a part of my
puzzle that can be easily done in image processing software such as ENVI but
I am looking for an R solution. I have a list of lines ob
Great, I didn't know it... I just made a rapid try some time ago but
it failed because I didn't use the ""
I'm sorry for bothering, how are you using R with CGAL?
2008/3/31, Murray Richardson <[EMAIL PROTECTED]>:
>
> See below. Haven't tried this yet.
>
> Yes that is what CGAL stands for.
>
>
See below. Haven't tried this yet.
Yes that is what CGAL stands for.
Murray
Hi Murray,
Regarding the first question, you can read into R first and then output
it again. You could also call ogr2ogr using a system call like:
system("ogr2ogr normal syntax stuff")
cheers,
Paul
G. Allegr
Well, my innput has not been so useful, but yours do :-)
cgal stands for "computational geometry algorithms library"?
If yes, I will ask you a thing later...
How do you call system commands from R?
Giovanni
2008/3/31, Murray Richardson <[EMAIL PROTECTED]>:
> Actually I am currently running an
Actually I am currently running an R script to link output from cgal
routines to postGIS which allows me to handle massive tables and has
some other advantages for my problem. However, this clarifies the
import export option somewhat (although I just learned that I can invoke
ogr2ogr as a syst
Hi Murray.
About the first question. As far as I understand, you're working in R
on a *imported* PostGIS layer (I suppose you use rgdal to do it,
right?). Then you would need to export it to a shapefile (easily done
with writeOGR). Why are you considering the use of ogr2ogr? As you
probably know,
Hello list members,
I think I must be missing some obvious documentation somewhere; I'm not
sure how I can access ogr2ogr vial R to convert a postGIS layer to a
shapefile. Must I use readOGR and writeOGR in rgdal instead or is there
a way to call ogr2ogr directly? If so do I have to call the o
