[R-sig-Geo] ogr2ogr for converting postGIS layer to shapefile

[G. Allegri]

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 <murray.richardson at utoronto.ca>:
> 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 system command which would be a faster option I guess.
>
>  Thanks for you input.
>
>
>  Murray
>
>
>
>
>  G. Allegri wrote:
>  > 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, it's a binary callable from a command line, and it's
>  > not possible (AFAIK) to do it from R...
>  >
>  > I dont' understand your second question...
>  >
>  >> Or even better could ogr be used to do this directly on a postGIS layer?
>  >>
>  > What do you mean?
>  >
>  > Giovanni
>  >
>  >
>