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Development of a global hybrid forest mask through the synergy of remote sensing, crowdsourcing and FAO statistics.

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Title: Development of a global hybrid forest mask through the synergy of remote sensing, crowdsourcing and FAO statistics.
Authors: Schepaschenko, Dmitry1,2 schepd@iiasa.ac.at, See, Linda1 see@iiasa.ac.at, Lesiv, Myroslava1,3,4 myroslava.lesiv@gmail.com, McCallum, Ian1 mccallum@iiasa.ac.at, Fritz, Steffen1 fritz@iiasa.ac.at, Salk, Carl1,5 carlsalk@gmail.com, Moltchanova, Elena6 moltchan@iiasa.ac.at, Perger, Christoph1 pergerch@iiasa.ac.at, Shchepashchenko, Maria7 mariaschep@gmail.com, Shvidenko, Anatoly1 shvidenk@iiasa.ac.at, Kovalevskyi, Sergii8 kovalevskyis.s@gmail.com, Gilitukha, Dmytro8 dmitriy.nau@gmail.com, Albrecht, Franziska1 franziska.k.albrecht@gmail.com, Kraxner, Florian1 kraxner@iiasa.ac.at, Bun, Andriy9 andr.bun@gmail.com, Maksyutov, Shamil10 shamil@nies.go.jp, Sokolov, Alexander11 sokolov_a66@mail.ru, Dürauer, Martina1 duerauer@iiasa.ac.at, Obersteiner, Michael1 oberstei@iiasa.ac.at, Karminov, Viktor2 vnk57@yandex.ru
Source: Remote Sensing of Environment. Jun2015, Vol. 162, p208-220. 13p.
Subjects: Remote-sensing images, Food & Agriculture Organization of the United Nations, Forest maps, Crowdsourcing, MODIS (Spectroradiometer)
Abstract: A number of global and regional maps of forest extent are available, but when compared spatially, there are large areas of disagreement. Moreover, there is currently no global forest map that is consistent with forest statistics from FAO (Food and Agriculture Organization of the United Nations). By combining these diverse data sources into a single forest cover product, it is possible to produce a global forest map that is more accurate than the individual input layers and to produce a map that is consistent with FAO statistics. In this paper we applied geographically weighted regression (GWR) to integrate eight different forest products into three global hybrid forest cover maps at a 1 km resolution for the reference year 2000. Input products included global land cover and forest maps at varying resolutions from 30 m to 1 km, mosaics of regional land use/land cover products where available, and the MODIS Vegetation Continuous Fields product. The GWR was trained using crowdsourced data collected via the Geo-Wiki platform and the hybrid maps were then validated using an independent dataset collected via the same system. Three different hybrid maps were produced: two consistent with FAO statistics, one at the country and one at the regional level, and a “best guess” forest cover map that is independent of FAO. Independent validation showed that the “best guess” hybrid product had the best overall accuracy of 93% when compared with the individual input datasets. The global hybrid forest cover maps are available at http://biomass.geo-wiki.org . [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A number of global and regional maps of forest extent are available, but when compared spatially, there are large areas of disagreement. Moreover, there is currently no global forest map that is consistent with forest statistics from FAO (Food and Agriculture Organization of the United Nations). By combining these diverse data sources into a single forest cover product, it is possible to produce a global forest map that is more accurate than the individual input layers and to produce a map that is consistent with FAO statistics. In this paper we applied geographically weighted regression (GWR) to integrate eight different forest products into three global hybrid forest cover maps at a 1 km resolution for the reference year 2000. Input products included global land cover and forest maps at varying resolutions from 30 m to 1 km, mosaics of regional land use/land cover products where available, and the MODIS Vegetation Continuous Fields product. The GWR was trained using crowdsourced data collected via the Geo-Wiki platform and the hybrid maps were then validated using an independent dataset collected via the same system. Three different hybrid maps were produced: two consistent with FAO statistics, one at the country and one at the regional level, and a “best guess” forest cover map that is independent of FAO. Independent validation showed that the “best guess” hybrid product had the best overall accuracy of 93% when compared with the individual input datasets. The global hybrid forest cover maps are available at http://biomass.geo-wiki.org . [ABSTRACT FROM AUTHOR]
ISSN:00344257
DOI:10.1016/j.rse.2015.02.011