I would like to plot data which consist of a number of points, each of which has a latitude, a longitude, an x-velocity, and a y-velocity. I want to plot an arrow for each point that starts at the proper latitude and longitude, and has a length and direction that show the velocity. I used to think of these as vector values, but in GRASS a vector is something else. What is the proper GRASS terminology for this kind of data? What modules do this kind of plot?
tia,
david adam
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