1. Bellevue tall buildings. https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Bellevue _Washington. Accessed: 2019-06-01. Bellevue tall buildings. https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Bellevue _Washington. Accessed: 2019-06-01.
2. Bing maps snap to road api. https://www.microsoft.com/en-us/maps/snap-to-road. Accessed: 2019-06-01. Bing maps snap to road api. https://www.microsoft.com/en-us/maps/snap-to-road. Accessed: 2019-06-01.
3. Seattle tall buildings. https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Seattle. Accessed: 2019-06-01. Seattle tall buildings. https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Seattle. Accessed: 2019-06-01.
4. Map++: A crowd-sensing system for automatic map semantics identification