7. The method of claim 1 , further comprising: creating a graph of geographic features where 1) each vertex in the graph is one of the plurality of geographic features, 2) edges of the graph that connect the geographic features are weighted, and 3) geographic features that are found to be similar are connected in the graph; and propagating labels over the graph.
7. The method of claim 1 , further comprising: creating a graph of geographic features where 1) each vertex in the graph is one of the plurality of geographic features, 2) edges of the graph that connect the geographic features are weighted, and 3) geographic features that are found to be similar are connected in the graph; and propagating labels over the graph. 8. The method of claim 7 , wherein propagating labels over the graph includes: at each vertex, initializing the labels associated therewith to an equal weight summing to a predetermined number; sending the labels across all connections associated with a given vertex; at each vertex, aggregating the labels received including scaling the weights of the labels; and repeating the sending until label weights stop changing over the graph.