@Article{isprs-archives-XLI-B4-253-2016,
AUTHOR = {Walter, V. and Laupheimer, D. and Fritsch, D.},
TITLE = {USE AND OPTIMISATION OF PAID CROWDSOURCING
FOR THE COLLECTION OF GEODATA},
JOURNAL = {The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences},
VOLUME = {XLI-B4},
YEAR = {2016},
PAGES = {253--257},
URL = {https://isprs-archives.copernicus.org/articles/XLI-B4/253/2016/},
DOI = {10.5194/isprs-archives-XLI-B4-253-2016}
}