Part of book/report Mapping and the citizen sensor. Foody, G.; Fritz, S.; Fonte, C. C.; Bastin, L.; Olteanu-Raimond, A.-M.; Mooney, P.; See, L.; Antoniou, V.; Liu, H.-Y.; Minghini, M.; Vatseva, R. Publication details Book: Mapping and the citizen sensor, 1–12, Chapter 1, 2017 DOI: 10.5334/bbf