DESCRIPTION

This purpose of this module is to provide local environmental context to a series of vector points.

v.what.rast or r.what + coordinate alone may return a spike in the raster data without you knowing. What this script does is create a buffer around each vector point and gather some stats about the raster cells nearby and report them in a .csv table. Multiple raster maps can be sampled. It assumes the location is not lat/lon, and (in column names) that units will be meters. (r.buffer would be lat/lon safe; but I used r.circle because it allows starting from an exact coord not from the nearest cell)

v.rast.stats + v.buffer is problematic when input points' buffers overlap.

To speed up processing the working region is temporarily zoomed to a small area around each point. This will align the temporary region to the raster map's resolution and thus assumes that the raster map's region and resolution line up with each other.

EXAMPLE

# Spearfish dataset
v.what.rast.buffer in=archsites rast=elevation.dem,slope out="-"

SEE ALSO

r.what
v.what.rast
v.rast.stats
r.univar
v.univar
r.buffer
r.circle
g.region

AUTHOR

Hamish Bowman
Dunedin, New Zealand

Last changed: $Date$