I am trying to plot velocities (from GPS data) as arrows in ArcGIS 10.3. Say the velocity at one point is 20 mm/y and at another point 40 mm/y. I will worry about the direction later - let us assume it is straight north. I would like to symbolize the data points as arrows starting at the coordinates of the datapoint, going straight north and with a length of respectively 20-times some unit and 40-times some unit.
I know I can use arrow symbols when using the "Symbology - Quantities - Graduated symbols" but that does not scale each arrow exactly by the value in question. For "Symbology - Quantities - Proportional symbols", I can only figure out how to make the size of squares or circles proportional to some value but not the length of an arrow.
Has anyone done this?
If it is not doable in Arc - is there some open source GIS that can do that?