Mapping Crosswalk Coverage via Satellite Imagery in San Francisco.

I particularly commend the absolute grind of the data collection method:

The method was time-consuming, but simple. I manually reviewed satellite imagery at every single intersection citywide. I did this in order to maximize accuracy, and dig deeper than a binary crosswalk vs. no-crosswalk score.

Previously, previously, previously, previously.

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3 Responses:

  1. Juan Antonio de los Palotes Machado says:

    did he (try getting the info from|upload them to) OSM?

    • jwz says:

      Why don't you ask someone who would know, like for example, not me?

      Or you could read the article -- or even the pull-quote here -- for why he decided that trusting someone else's pre-digested map data was not a good way to get accurate results.

  2. thielges says:

    Nice to see that there authors recognize that an unmarked crosswalk is still a crosswalk. If most motorists also expected people to walk across unpainted intersections then the lack of marking would not be such a big problem.

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