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Sidewalk Widths NYC

Sidewalk Widths NYC uses New York City's Sidewalk dataset to produce a map of sidewalk widths for the 5 boroughs.

This repo contains the notebooks to reproduce this work, as well as the finished Sidewalk Width dataset in GeoJSON format.

Link

www.sidewalkwidths.nyc

Methodology

  1. Polygons from NYC open data

Sidewalk Polygons

  1. Dissolve adjacent sidewalk polygons

Sidewalk Polygons Dissolved

  1. Find sidewalk centerlines

Centerlines

  1. Remove short ends and simplify

Centerlines Simplified

  1. Measure distance from centerlines to original polygon

Centerlines Widths

Forking

If you want to make a version of Sidewalk Widths for your own city, just fork this repo and use whatever portion of the code you like. Not all cities will have publicly accessible planimetric sidewalk data, so you may need to produce the sidewalk dataset in a different way (i.e. curbs to parcel boundaries).

The website should work with only a few changes. I've consolidated most of the variables you need to customize in a file called settings.js. It should include things like your Mapbox token, sidewalk width ratings, and units of measurement for you to customize.

Virtual environment

The fastest way to get your vitual environment configured to run the Jupyter Notebook is by using Anaconda to install the following depedencies. In the Anaconda prompt type the following:

conda create -n opendata-env -c conda-forge python=3.8 geopandas matplotlib tqdm notebook ipywidgets

Now activate your virtual environment by typing the following into the Anaconda Prompt and pressing enter.

conda activate opendata-env

Finally, install this last python package by typing the following in the Anaconda Prompt and pressing enter.

pip install centerline

Mapbox

Sidewalk widths uses Mapbox for the custom map style and serve the sidewalk widths data as a tileset. If you're creating your own version of the site you must make a Mapbox account and replace the access token with your own. My access token is restricted to the www.sidewalkwidths.nyc URL.

Tilesets

To create a tileset from your sidewalk width GeoJSON, following the Mapbox documentation here.

Custom Style

You can copy the sidewalk widths custom Mapbox style here.

About

Measuring sidewalk widths for NYC using sidewalk outlines.

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