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You can use ST_ConcaveHull to get approximate polygon. Since the lines don't actually form the boundary of the areas you're going to have some difficulty getting a perfect coverage of polygons from the data. Another possibility is building a line voronoi using the faces and assign faces to categories based on what lines fall within the faces. I don't know ...


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I have used an arrow symbol as: SYMBOL NAME "arrow" TYPE vector FILLED true POINTS 0 0.4 3 0.4 3 0 5 0.8 3 1.6 3 1.2 0 1.2 0 0.4 END # POINTS ANCHORPOINT 1 0.5 END # SYMBOL This style adds an arrowhead to endpoints of lines ...



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