Add length of trails to transportation layer #5
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Adds trail length to the transportation layer. This is computationally intensive because each LineString is currently reprojected to WGS84 and then taken the length of (in meters).
For now, this is only computed at zooms >=12, and only on
class=path. It doesn't show up on non-class=path, which means that it should increase the size of the vector tiles only marginally:Ideally I'll also split LineStrings at intersections, but I haven't figured that out yet.