| 来源类型 | Article |
| 规范类型 | 其他 |
| DOI | 10.1111/gcb.14492 |
| Estimating the Global Distribution of Field Size using Crowdsourcing. | |
| Lesiv M; Laso Bayas JC; See L; Dürauer M; Dahlia D; Durando N; Hazarika R; Sahariah PK | |
| 发表日期 | 2019 |
| 出处 | Global Change Biology 25 (1): 174-186 |
| 出版年 | 2019 |
| 语种 | 英语 |
| 摘要 | There is 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, e.g. 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 130K 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 modelling, 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. |
| 主题 | Ecosystems Services and Management (ESM) |
| 关键词 | field size, crowdsourcing, visual interpretation, environmental changes, food security |
| URL | http://pure.iiasa.ac.at/id/eprint/15558/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/131600 |
| 推荐引用方式 GB/T 7714 | Lesiv M,Laso Bayas JC,See L,et al. Estimating the Global Distribution of Field Size using Crowdsourcing.. 2019. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| gcb.14492.pdf（2875KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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