Hi, Given a binary land/sea raster, I’m trying to calculate the shortest distance from each land cell to the sea within a range of wind directions (e.g. 85-95 degrees from north). The calculation is basically r.grow.distance with an extra parameter for the range of directions (or a raster of the input bearings at each cell) with which to restrict the spreading function.
I’d appreciated any advice on how to to implement something like this in GRASS. I have an implementation in R that draws a line from each cell along the given bearing and finds the length of the segment that intersects with a land polygon (vectorized from the land/sea raster). This is slow for larger rasters and doesn't apply to a range of directions, so it looks like something closer to r.grow.distance is the way to go. Thanks for any suggestions, Nick *Nicolas E. Gauthier* Graduate Research Assistant, Center for Social Dynamics and Complexity School of Human Evolution and Social Change Arizona State University nicolas.gauth...@asu.edu
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