Hello all, I am better at GRASS raster capabilities than with GRASS vector handling, so I am writing to get your help.
What I want to do is this: 1. I will have one vector dataset of watersheds. Each record is a polygon, an individual watershed. There are, apart from the usual cat fields, 52 attribute columns. Each attribute column is modeled weekly snow depth. 2. I need to automate the display and export to png of 52 thematic images - one for each week/column - keeping the color scheme constant throughout. Then all of the images will be packaged into a kml animation. I know how to do the above starting from a stack of GRASS rasters, but am not quickly getting a handle on displaying GRASS vectors consistently. I've tried d.vect and d.vect.thematic. I havent tried d.thematic.area yet. The main issues are that I dont know: - how to assign a constant color scheme to each map (that spans the min and max of all columns); i guess i was looking for something as simple as setting color rules like with raster data. - how to refer to each attribute column by column number in a loop (d.vect.thematic and d.thematic.area seem to need column name as attribute) Any pointers would be greatly appreciated, Vishal Vishal K. Mehta, PhD Scientist Stockholm Environment Institute - US 133 D St Suite F Davis CA 95616 www.sei-us.org
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