A global reference data set on cropland was collected through a crowdsourcing campaign using the Geo- Wiki crowdsourcing tool. The campaign lasted three weeks, with over 80 participants from around the world reviewing almost 36,000 sample units, focussing on cropland identification. For quality assessment purposes, two additional data sets are provided. The first is a control set of 1,793 sample locations validated by students trained in satellite image interpretation. This data set was used to assess the quality of the crowd as the campaign progressed. The second data set contains 60 expert validations for additional evaluation of the quality of the contributions. All data sets are split into two parts: the first part shows all areas classified as cropland and the second part shows cropland average per location and user. After further processing, the data presented here might be suitable to validate and compare medium and high resolution cropland maps generated using remote sensing. These could also be used to train classification algorithms for developing new maps of land cover and cropland extent.
Friedl Mark A., Sulla-Menashe Damien, Tan Bin, Schneider Annemarie, Ramankutty Navin, Sibley Adam, Huang Xiaoman, MODIS Collection 5 global land cover: Algorithm refinements and characterization of new datasets, 10.1016/j.rse.2009.08.016
Chen Jun, Chen Jin, Liao Anping, Cao Xin, Chen Lijun, Chen Xuehong, He Chaoying, Han Gang, Peng Shu, Lu Miao, Zhang Weiwei, Tong Xiaohua, Mills Jon, Global land cover mapping at 30m resolution: A POK-based operational approach, 10.1016/j.isprsjprs.2014.09.002
Fritz Steffen, See Linda, McCallum Ian, Schill Christian, Obersteiner Michael, van der Velde Marijn, Boettcher Hannes, Havlík Petr, Achard Frédéric, Highlighting continued uncertainty in global land cover maps for the user community, 10.1088/1748-9326/6/4/044005
Fritz Steffen, See Linda, Rembold Felix, Comparison of global and regional land cover maps with statistical information for the agricultural domain in Africa, 10.1080/01431160902946598
Waldner François, Fritz Steffen, Di Gregorio Antonio, Defourny Pierre, Mapping Priorities to Focus Cropland Mapping Activities: Fitness Assessment of Existing Global, Regional and National Cropland Maps, 10.3390/rs70607959
Gallego Francisco Javier, Validation of GIS layers in the EU: getting adapted to available reference data, 10.1080/17538947.2010.512746
Tsendbazar N.E., de Bruin S., Herold M., Assessing global land cover reference datasets for different user communities, 10.1016/j.isprsjprs.2014.02.008
Fritz Steffen, See Linda, Perger Christoph, McCallum Ian, Schill Christian, Schepaschenko Dmitry, Duerauer Martina, Karner Mathias, Dresel Christopher, Laso-Bayas Juan-Carlos, Lesiv Myroslava, Moorthy Inian, Salk Carl F., Danylo Olha, Sturn Tobias, Albrecht Franziska, You Liangzhi, Kraxner Florian, Obersteiner Michael, A global dataset of crowdsourced land cover and land use reference data, 10.1038/sdata.2017.75
Fritz S., Environ. Sci. Technol., 47, 1688 (2013)
See Linda, Fritz Steffen, Perger Christoph, Schill Christian, McCallum Ian, Schepaschenko Dmitry, Duerauer Martina, Sturn Tobias, Karner Mathias, Kraxner Florian, Obersteiner Michael, Harnessing the power of volunteers, the internet and Google Earth to collect and validate global spatial information using Geo-Wiki, 10.1016/j.techfore.2015.03.002
Fritz Steffen, See Linda, McCallum Ian, You Liangzhi, Bun Andriy, Moltchanova Elena, Duerauer Martina, Albrecht Fransizka, Schill Christian, Perger Christoph, Havlik Petr, Mosnier Aline, Thornton Philip, Wood-Sichra Ulrike, Herrero Mario, Becker-Reshef Inbal, Justice Chris, Hansen Matthew, Gong Peng, Abdel Aziz Sheta, Cipriani Anna, Cumani Renato, Cecchi Giuliano, Conchedda Giulia, Ferreira Stefanus, Gomez Adriana, Haffani Myriam, Kayitakire Francois, Malanding Jaiteh, Mueller Rick, Newby Terence, Nonguierma Andre, Olusegun Adeaga, Ortner Simone, Rajak D. Ram, Rocha Jansle, Schepaschenko Dmitry, Schepaschenko Maria, Terekhov Alexey, Tiangwa Alex, Vancutsem Christelle, Vintrou Elodie, Wenbin Wu, van der Velde Marijn, Dunwoody Antonia, Kraxner Florian, Obersteiner Michael, Mapping global cropland and field size, 10.1111/gcb.12838
Gengler Sarah, Bogaert Patrick, Integrating Crowdsourced Data with a Land Cover Product: A Bayesian Data Fusion Approach, 10.3390/rs8070545
Waldner François, Fritz Steffen, Di Gregorio Antonio, Plotnikov Dmitry, Bartalev Sergey, Kussul Nataliia, Gong Peng, Thenkabail Prasad, Hazeu Gerard, Klein Igor, Löw Fabian, Miettinen Jukka, Dadhwal Vinay, Lamarche Céline, Bontemps Sophie, Defourny Pierre, A Unified Cropland Layer at 250 m for Global Agriculture Monitoring, 10.3390/data1010003
Waldner François, De Abelleyra Diego, Verón Santiago R., Zhang Miao, Wu Bingfang, Plotnikov Dmitry, Bartalev Sergey, Lavreniuk Mykola, Skakun Sergii, Kussul Nataliia, Le Maire Guerric, Dupuy Stéphane, Jarvis Ian, Defourny Pierre, Towards a set of agrosystem-specific cropland mapping methods to address the global cropland diversity, 10.1080/01431161.2016.1194545
Bibliographic reference
Laso Bayas, Juan Carlos ; Lesiv, Myroslava ; Waldner, François ; Schucknecht, Anne ; Duerauer, Martina ; et. al. A global reference database of crowdsourced cropland data collected using the Geo-Wiki platform. In: Scientific Data, Vol. 4, p. 170136 (2017)