Symbolize Polygons By Unique Outline Colors but Empty Fill
Can I symbolize my polygon layer by unique values but using a ramp of unique 'Outline Colors' but with no fill color? Using filled values and playing with the transparancey setting doesn't work in this case. I need the fill color to be 'empty'.
Mapping Center Answer:
As you note, you CAN vary the interior of the polygon (the fill) usign a color ramp but you cannot vary the outlines. However, there are a couple of workarounds.
You can create multiple layers so that each layer contains the features you want to have the same outline color. If you only have 4 or so unique polygon outline colors, then this isn't so bad. But if you have more, it can get tedious and it become more challenging in terms of layer management.
Another solution is to use tint bands but this will mean that the polygon outlines will actually be drawn slightly inside the outlines. We wrote a blog entry about this. Because the features you would be symbolizing are actually polygons, you can then use the color ramps to define the colors of the tint bands.
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