Hi Frauke,
in the RSAGA package there is a function pick.from.ascii.grid which does
exactly what you want. Even works with large grids as it can process
them row by row. I use it for extracting point data from stacks of
Landsat bands, terrain attributes etc.
Here a case study (landslide susceptibility modeling):
http://www.environment.uwaterloo.ca/u/brenning/Brenning-2008-RSAGA.html
also available as pdf:
http://www.environment.uwaterloo.ca/u/brenning/Brenning-2008-RSAGA.pdf
I hope this helps
Cheers
Alex
Frauke Barthold wrote:
Dear list,
I have a soilmap as an Ascii grid and a dataframe with x and y
coordinates (these are sampling points). I would now like to extract
values from the soilmap to the dataframe based on location, the x
and y values. Is there any way to do this in R?
Cheers, Frauke
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Alexander Brenning
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Department of Geography and Environmental Management
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200 University Ave. W - Waterloo, ON - Canada N2L 3G1
http://www.fes.uwaterloo.ca/geography/faculty/brenning/
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