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Creating a sidewalk map for a walkability survey

Geographic Information Systems Asked by charlesw on February 24, 2021

If I wanted to do my own walkability survey of my city, what tools could I use? I have map data from OpenStreetMap, but I have to consider that streets have two sides (which aren’t always accessible from the other side of the street). I guess I need to make a sidewalk map.

I’d like to use path-finding algorithms against the data to provide walking directions that avoid sections of streets with poor walkability. Some blocks have sidewalks, some don’t, and some streets have a sidewalk on one side but are too busy to cross. The directions would cross the highway at places where it’s easier–very easy at the crosswalk, hard at several other streets, impossible at a few streets.

I know that weighted path-finding algorithms exist. I’m just wondering how to create this data. I’ve toyed with taking a map image, putting it in Inkscape, turning on grid lines, and overlaying paths along the sidewalks. With the grid lines, the points of paths connect for path-finding. Path color indicates difficulty of walking. Aside from the path-finding, it’d be a good map to show walkability in town.

Anyone have any ideas?

One Answer

If the City has performed a LIDAR scan of the road network to generate a complete map of the sidewalk network, it may be useful to create a "Missing Sidewalk Map". I described how I did that in another answer:

How can I programmatically identify missing sidewalks in OpenStreetMap data?

Answered by Mark Stosberg on February 24, 2021

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