This graphic is from the City of Mankato. It marks a boulevard ash tree with a green line. All the green lines are placed on a map of Mankato's streets and buildings. In total there are about 2,400 green lines on this map. Note that this does not account for all the trees in the city—just the boulevard ash trees, which the city has planted. The amount of ashes planted on private property and public parks is certain to be 5 or 10 times the amount on the boulevards.
Of course, the map is hard to read. The lines create a green tint to the map from a distance. Close up, it is hard to tell where the trees are, especially when the street runs parallel to the direction of the line markers.
The density of monoculture planting is evident in a closeup of Balcerzak, seen below.
That's a lot of ash trees! The lines make this seem more like a computer score card than an information graphic though. Another representation, made from the same source of information, from the Mankato Free Press looks much better because it maintains a stronger figure-ground contrast and it "tames the grid" as Edward R. Tufte would say.
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