[R-sig-Geo] comparing raster and vector data with Grass/R

Edzer J. Pebesma e.pebesma at geo.uu.nl
Wed Mar 7 08:32:37 CET 2007

Using the classes and methods for spatial data in package sp, typically 
the dem would be stored in a grid (SpatialGridDataFrame) and the vector 
data in a SpatialPointsDataFrame. Then you can use the overlay method to 
retrieve the dem values at point locations, to look at their relationship.

Schmitt Thierry wrote:
> Hi members of the list
> I am new to the R community (somewhat to the grass community also). I would like to see if there is any correlation between vector data (polyline connected to a db file) and classes from an analysis on a raster file. Namely I have an underwater DEM (raster 4m resolution) and transects of interpreted underwater camera (vector-db, one transect is around 30m).
> My aim would to plot one of the variable from the "camera" transect vs. the classes extracted along the co-located raster transect. 
> If anybody could give a hint or some area of investigation, it will be more than welcome.
> TS
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