Lesiv, Myroslava
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Laso Bayas, Juan Carlos
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
See, Linda
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Duerauer, Martina
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Dahlia, Domian
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Durando, Neal
[OPC Nantes Métropol, Nantes, France]
Hazarika, Rubul
[Department of Geography, B. Borooah College, Guwahati, India]
Kumar Sahariah, Parag
[Department of Geography, B. Borooah College, Guwahati, India]
Vakolyuk, Mar'yana
[Department of Energy and Mass Exchange in Geosystems, State Institution Scientific Centre for Aerospace Research of the Earth Institute of Geological Science National Academy of Sciences of Ukraine, Kyiv, Ukraine]
Blyshchyk, Volodymyr
[Forest Management, Nacional'nyj Universytet Bioresursiv i Pryrodokorystuvannya Ukrayiny, Kyiv, Ukraine]
Bilous, Andrii
[Department of Energy and Mass Exchange in Geosystems, State Institution Scientific Centre for Aerospace Research of the Earth Institute of Geological Science National Academy of Sciences of Ukraine, Kyiv, Ukraine]
Perez‐Hoyos, Ana
[European Commission Joint Research Centre Ispra Sector, Ispra, Italy]
Gengler, Sarah
[UCL]
Prestele, Reinhard
[Department of Earth Sciences, Environmental Geography Group, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands]
Bilous, Svitlana
[Forest Management, Nacional'nyj Universytet Bioresursiv i Pryrodokorystuvannya Ukrayiny, Kyiv, Ukraine]
Akhtar, Ibrar ul Hassan
[Department of Meteorology, COMSATS University & Pakistan Space and Upper Atmosphere Research Commission, Islamabad, Pakistan]
Singha, Kuleswar
[Gauhati University, Guwahati, India]
Choudhury, Sochin Boro
[Gauhati University, Guwahati, India]
Chetri, Tilok
[Kumaun University, Nainital, India]
Malek, Žiga
[Vrije Universiteit Amsterdam Faculteit Economische wetenschappen en Bedrijfskunde, Amsterdam, The Netherlands]
Bungnamei, Khangsembou
[Gauhati University, Guwahati, India]
Saikia, Anup
[Gauhati University, Guwahati, India]
Sahariah, Dhrubajyoti
[Gauhati University, Guwahati, India]
Narzary, William
[Kumaun University, Nainital, India]
Danylo, Olha
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Sturn, Tobias
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Karner, Mathias
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
McCallum, Ian
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Schepaschenko, Dmitry
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria & Soil Science, Moscow State Forest University, Moscow, Russia]
Moltchanova, Elena
[University of Canterbury, Christchurch, New Zealand]
Fraisl, Dilek
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Moorthy, Inian
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
Fritz, Steffen
[International Institute for Applied Systems Analysis, ESM, Laxenburg, Austria]
There is an increasing evidence that smallholder farms contribute substantially to food production globally, yet spatially explicit data on agricultural field sizes are currently lacking. Automated field size delineation using remote sensing or the estimation of average farm size at subnational level using census data are two approaches that have been used. However, both have limitations, for example, automatic field size delineation using remote sensing has not yet been implemented at a global scale while the spatial resolution is very coarse when using census data. This paper demonstrates a unique approach to quantifying and mapping agricultural field size globally using crowdsourcing. A campaign was run in June 2017, where participants were asked to visually interpret very high resolution satellite imagery from Google Maps and Bing using the Geo‐Wiki application. During the campaign, participants collected field size data for 130 K unique locations around the globe. Using this sample, we have produced the most accurate global field size map to date and estimated the percentage of different field sizes, ranging from very small to very large, in agricultural areas at global, continental, and national levels. The results show that smallholder farms occupy up to 40% of agricultural areas globally, which means that, potentially, there are many more smallholder farms in comparison with the two different current global estimates of 12% and 24%. The global field size map and the crowdsourced data set are openly available and can be used for integrated assessment modeling, comparative studies of agricultural dynamics across different contexts, for training and validation of remote sensing field size delineation, and potential contributions to the Sustainable Development Goal of Ending hunger, achieve food security and improved nutrition and promote sustainable agriculture.
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Bibliographic reference
Lesiv, Myroslava ; Laso Bayas, Juan Carlos ; See, Linda ; Duerauer, Martina ; Dahlia, Domian ; et. al. Estimating the global distribution of field size using crowdsourcing. In: Global Change Biology, Vol. 25, no. 1, p. 174-186 (2019)