TY - JOUR A1 - Walter, V. A1 - Laupheimer, D. A1 - Fritsch, D. T1 - USE AND OPTIMISATION OF PAID CROWDSOURCING FOR THE COLLECTION OF GEODATA JO - Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. J1 - ISPRS-Archives VL - XLI-B4 SP - 253 EP - 257 Y1 - 2016/06/13 PB - Copernicus Publications SN - 2194-9034 UR - https://isprs-archives.copernicus.org/articles/XLI-B4/253/2016/ L1 - https://isprs-archives.copernicus.org/articles/XLI-B4/253/2016/isprs-archives-XLI-B4-253-2016.pdf DO - 10.5194/isprs-archives-XLI-B4-253-2016 ER -