Plotting direction vectors from an aspect map
For doing this within R also have a look at ggplot2, with a simple sin and cos one could use geom_segment http://had.co.nz/ggplot2/geom_segment.html Bart
On 09/16/2011 04:22 AM, Dylan Beaudette wrote:
This comes to mind: http://casoilresource.lawr.ucdavis.edu/drupal/node/989 Note shameless self promotion. Dylan On Sep 15, 2011 6:19 PM, "Jonathan Greenberg"<greenberg at ucdavis.edu> wrote:
R-sig-geo'ers: Given an aspect raster (GDAL-readable), is there a way to plot the aspect image using arrows representing each cell's direction? I'm assuming I have to convert the raster to a set of points -- are there arrow symbols and, if so, can you rotate them based on some parameter? Thanks! --j -- Jonathan A. Greenberg, PhD Assistant Project Scientist Center for Spatial Technologies and Remote Sensing (CSTARS) Department of Land, Air and Water Resources University of California, Davis One Shields Avenue Davis, CA 95616 Phone: 415-763-5476 AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307
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