crowd sourcing

Miyazaki, H., Kimijima, S., Nagai, M., Iwao, K., & Shibasaki, R. (2012). Crowd-Sourcing GIS for Global Urban Area Mapping. Pattaya, Thailand.
Miyazaki, H., Iwao, K., & Shibasaki, R. (2011). Development of a New Ground Truth Database for Global Urban Area Mapping from a Gazetteer. Remote Sensing, 3, 1177–1187. https://doi.org/10.3390/rs3061177