http://link.springer.com/chapter/10.1007/978-3-319-40902-3_26
From the book: Seeing Cities Through Big Data
- There are 10s of thousands of public, outdoor, online streaming webcams.
- These can be repurposed for evaluating public space and physical activity.
- With so many cameras and images, we used crowdsources to count/annotate people, bikes, and cars in images. We found crowdsources to be reliable and valid.
- These are scalable methods for built environment, walkability, and physical activity measurement.