Validation of Automatically Generated Global and Regional Cropland Data Sets: The Case of Tanzania
| Autor: | Linda See, J. Dempewolf, Steffen Fritz, Juan Carlos Laso Bayas, Catherine Nakalembe, C. Justice, Christoph Perger |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Science 0211 other engineering and technologies Sample (statistics) 02 engineering and technology Land cover computer.software_genre 01 natural sciences land cover validation cropland Geo-Wiki agricultural monitoring Article Consistency (statistics) Statistics Product (category theory) 021101 geological & geomatics engineering 0105 earth and related environmental sciences biology business.industry 15. Life on land biology.organism_classification Data set Tanzania Agriculture General Earth and Planetary Sciences Environmental science Data mining business computer Quality assurance |
| Zdroj: | Remote Sensing, Vol 9, Iss 8, p 815 (2017) Remote Sensing; Volume 9; Issue 8; Pages: 815 Remote Sensing |
| ISSN: | 2072-4292 |
| Popis: | There is a need to validate existing global cropland maps since they are used for different purposes including agricultural monitoring and assessment. In this paper we validate three recent global products (ESA-CCI, GlobeLand30, FROM-GC) and one regional product (Tanzania Land Cover 2010 Scheme II) using a validation data set that was collected by students through the Geo-Wiki tool. The ultimate aim was to understand the usefulness of these products for agricultural monitoring. Data were collected wall-to-wall for Kilosa district and for a sample across Tanzania. The results show that the amount of and spatial extent of cropland in the different products differs considerably from 8% to 42% for Tanzania, with similar values for Kilosa district. The agreement of the validation data with the four different products varied between 36% and 54% and highlighted that cropland is overestimated by the ESA-CCI and underestimated by FROM-GC. The validation data were also analyzed for consistency between the student interpreters and also compared with a sample interpreted by five experts for quality assurance. Regarding consistency between the students, there was more than 80% agreement if one difference in cropland category was considered (e.g., between low and medium cropland) while most of the confusion with the experts was also within one category difference. In addition to the validation of current cropland products, the data set collected by the students also has potential value as a training set for improving future cropland products. |
| Databáze: | OpenAIRE |
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