An entropy approach to spatial disaggregation of agricultural production
While agricultural production statistics are reported on a geopolitical – often national – basis we often need to know the status of production or productivity within specific sub-regions, watersheds, or agroecological zones. Such re-aggregations are typically made using expert judgments or simple a...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Elsevier
2006
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/172136 |
| _version_ | 1855541781646540800 |
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| author | You, Liangzhi Wood, Stanley |
| author_browse | Wood, Stanley You, Liangzhi |
| author_facet | You, Liangzhi Wood, Stanley |
| author_sort | You, Liangzhi |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | While agricultural production statistics are reported on a geopolitical – often national – basis we often need to know the status of production or productivity within specific sub-regions, watersheds, or agroecological zones. Such re-aggregations are typically made using expert judgments or simple area-weighting rules. We describe a new, entropy-based approach to making spatially disaggregated assessments of the distribution of crop production. Using this approach, tabular crop production statistics are blended judiciously with an array of other secondary data to assess the production of specific crops within individual ‘pixels’ – typically 25–100 square kilometers in size. The information utilized includes crop production statistics, farming system characteristics, satellite-derived land cover data, biophysical crop suitability assessments, and population density. An application is presented in which Brazilian state level production statistics are used to generate pixel level crop production data for eight crops. To validate the spatial allocation we aggregated the pixel estimates to obtain synthetic estimates of municipality level production in Brazil, and compared those estimates with actual municipality statistics. The approach produced extremely promising results. We then examined the robustness of these results compared to short-cut approaches to allocating crop production statistics and showed that, while computationally intensive, the cross-entropy method does provide more reliable estimates of crop production patterns. |
| format | Journal Article |
| id | CGSpace172136 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2006 |
| publishDateRange | 2006 |
| publishDateSort | 2006 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace1721362025-02-19T14:08:17Z An entropy approach to spatial disaggregation of agricultural production You, Liangzhi Wood, Stanley agricultural production entropy crop modelling remote sensing While agricultural production statistics are reported on a geopolitical – often national – basis we often need to know the status of production or productivity within specific sub-regions, watersheds, or agroecological zones. Such re-aggregations are typically made using expert judgments or simple area-weighting rules. We describe a new, entropy-based approach to making spatially disaggregated assessments of the distribution of crop production. Using this approach, tabular crop production statistics are blended judiciously with an array of other secondary data to assess the production of specific crops within individual ‘pixels’ – typically 25–100 square kilometers in size. The information utilized includes crop production statistics, farming system characteristics, satellite-derived land cover data, biophysical crop suitability assessments, and population density. An application is presented in which Brazilian state level production statistics are used to generate pixel level crop production data for eight crops. To validate the spatial allocation we aggregated the pixel estimates to obtain synthetic estimates of municipality level production in Brazil, and compared those estimates with actual municipality statistics. The approach produced extremely promising results. We then examined the robustness of these results compared to short-cut approaches to allocating crop production statistics and showed that, while computationally intensive, the cross-entropy method does provide more reliable estimates of crop production patterns. 2006-10 2025-01-29T12:59:25Z 2025-01-29T12:59:25Z Journal Article https://hdl.handle.net/10568/172136 en Limited Access Elsevier You, Liangzhi; Wood, Stanley. 2006. An entropy approach to spatial disaggregation of agricultural production. Agricultural Systems 90(1-3): 329-347. https://doi.org/10.1016/j.agsy.2006.01.008 |
| spellingShingle | agricultural production entropy crop modelling remote sensing You, Liangzhi Wood, Stanley An entropy approach to spatial disaggregation of agricultural production |
| title | An entropy approach to spatial disaggregation of agricultural production |
| title_full | An entropy approach to spatial disaggregation of agricultural production |
| title_fullStr | An entropy approach to spatial disaggregation of agricultural production |
| title_full_unstemmed | An entropy approach to spatial disaggregation of agricultural production |
| title_short | An entropy approach to spatial disaggregation of agricultural production |
| title_sort | entropy approach to spatial disaggregation of agricultural production |
| topic | agricultural production entropy crop modelling remote sensing |
| url | https://hdl.handle.net/10568/172136 |
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