morganherlocker/gist:80131404b2d977b5a86e

Last active August 29, 2015 14:10

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osrm isochrone

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gistfile1.md

drivetime polygons

##algorithm

create a grid around a point; grid should be (2*(minutes*0.8)) miles wide (assuming max speed is 70mph)
get the eta from the point to each gridpoint
run marching squares over the grid at the desired drive time

##notes

etas can be generated fast (sub-ms I believe), especially if not route is returned
should this be a node module calling into osrm through node-osrm, added into osrm core, something else? (http wrapper is probably way to slow and will reduce our ability to make high res rings)
turf-isobands might be a guide for marching squares, but I would like to tune the results a bit better

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