Re: [R-sig-Geo] Slope and Aspect calculations in R

cheers, Tom Hengl -Original Message- From: r-sig-geo-boun...@stat.math.ethz.ch [mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of Thomas Adams Sent: Friday, July 10, 2009 3:12 PM To: Josh London Cc: r-sig-geo@stat.math.ethz.ch Subject: Re: [R-sig-Geo] Slope and Aspect calcul

Re: [R-sig-Geo] Slope and Aspect calculations in R

have all our other analysis coded up in R, and just need these functions to do one part of a bigger process. Maybe I'm misunderstanding how to use R and GRASS together. I'll do some further research. Thanks again Josh Josh London wrote: Hello We are looking to mimic, in R, the slope

[R-sig-Geo] Slope and Aspect calculations in R

Hello We are looking to mimic, in R, the slope (max magnitude difference between a cell and its neighbors) and aspect (direction of maximum magnitude difference) functions found in ESRI's Spatial Analyst package. We were just about to code up the slope function but thought I would make sure w

[R-sig-Geo] georectify an image with tiepoints

Hello I trying to work out method for georectifying QuickSCAT sea-ice GIFs (http://nereids.jpl.nasa.gov/cgi-bin/ice.cgi?show=scat). The daily images are consistent in their layout and include overlayed graticules. In ArcMap, I create tiepoints at the graticule intersections and geo-rectify from t