[R] Dissolve polygon
b.rowlingson at lancaster.ac.uk
Fri Jul 20 20:11:11 CEST 2012
On Fri, Jul 20, 2012 at 4:51 PM, Celine <bellard.celine at gmail.com> wrote:
> I am working with a SpatialPolygonsDataFrame of many islands. There are a
> lot of polygons (islands) composing my SpatialPolygonsDataFrame.
> I want to extract the elevation of each island.
Is each island a row in your SPDF? Or is it just one row, with lots
of island polygons? What does dim(hot) (assuming 'hot' is your SPDF)
> I need to separate the different polygons (like dissolve function in
> arcgis), to have the elevation of each island.
If each island is a row, then its easy, if each island is a separate
loop in a single row, a bit trickier.
How are you going to get the elevation? Do you have a separate data
source, such as a grid of elevations?
Also, try hopping over to the R-sig-geo mailing list. For everything spatial.
More information about the R-help