  Despite the important role of sidewalks in supporting mobility,
accessibility, and public health, there is a lack of high-quality datasets and
corresponding analyses on sidewalk existence and condition. Our work explores a
twofold vision: first, to develop scalable mechanisms to locate and assess
sidewalks in cities across the world, and second, to use this data to support
new urban analyses and mobility tools. We report on two preliminary urban
science explorations enabled by our approach: exploring geo-spatial patterns
and key correlates of sidewalk accessibility and examining differences in
sidewalk infrastructure across regions.
