Mapping global cropland and field size

A new 1 km global IIASA-IFPRI cropland percentage map for the baseline year 2005 has been developed which integrates a number of individual cropland maps at global to regional to national scales. The individual map products include existing global land cover maps such as GlobCover 2005 and MODIS v.5, regional maps such as AFRICOVER and national maps from mapping agencies and other organizations. The different products are ranked at the national level using crowdsourced data from Geo-Wiki to create a map that reflects the likelihood of cropland. Calibration with national and subnational crop statistics was then undertaken to distribute the cropland within each country and subnational unit. The new IIASA-IFPRI cropland product has been validated using very high-resolution satellite imagery via Geo-Wiki and has an overall accuracy of 82.4%. It has also been compared with the EarthStat cropland product and shows a lower root mean square error on an independent data set collected from Geo-Wiki. The first ever global field size map was produced at the same resolution as the IIASA-IFPRI cropland map based on interpolation of field size data collected via a Geo-Wiki crowdsourcing campaign. A validation exercise of the global field size map revealed satisfactory agreement with control data, particularly given the relatively modest size of the field size data set used to create the map. Both are critical inputs to global agricultural monitoring in the frame of GEOGLAM and will serve the global land modelling and integrated assessment community, in particular for improving land use models that require baseline cropland information. These products are freely available for downloading from the http://cropland.geo-wiki.org website.

Rick Mueller | Steffen Fritz | Ian McCallum | Christian Schill | Christoph Perger | Florian Kraxner | Michael Obersteiner | Christelle Vancutsem | Linda See | Peng Gong | Elodie Vintrou | Petr Havlik | Alexey Terekhov | Matthew Hansen | Inbal Becker-Reshef | Liangzhi You | Elena Moltchanova | Stefanus Ferreira | Dmitry Schepaschenko | Mario Herrero | Giulia Conchedda | Andriy Bun | Wu Wenbin | Aline Mosnier | Anna Cipriani | Chris Justice | Ulrike Wood-Sichra | Giuliano Cecchi | Myriam Haffani | Martina Duerauer | C. Justice | L. You | M. Hansen | F. Kraxner | M. Obersteiner | P. Gong | P. Thornton | R. Mueller | I. McCallum | S. Fritz | L. See | I. Becker-Reshef | Wenbin Wu | Wu Wenbin | P. Havlík | E. Moltchanova | T. Newby | M. Velde | Elodie Vintrou | C. Schill | C. Perger | F. Kayitakire | M. Herrero | C. Vancutsem | M. Duerauer | Stefanus Ferreira | A. Mosnier | G. Conchedda | D. Schepaschenko | J. Rocha | G. Cecchi | R. Cumani | A. Gómez | U. Wood-Sichra | M. Schepaschenko | A. Bun | F. Albrecht | Sheta Abdel Aziz | A. Cipriani | M. Haffani | Jaiteh Malanding | A. Nonguierma | A. Olusegun | S. Ortner | D. Rajak | A. Terekhov | Alex Tiangwa | A. Dunwoody | Marijn van der Velde | Francois Kayitakire | Philip Thornton | Simone Ortner | Renato Cumani | Fransizka Albrecht | Sheta Abdel Aziz | Adriana Gomez | Jaiteh Malanding | Terence Newby | Andre Nonguierma | Adeaga Olusegun | D Ram Rajak | Jansle Rocha | Maria Schepaschenko | Alex Tiangwa | Antonia Dunwoody | I. Mccallum

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