Farming the planet: 1. Geographic distribution of global agricultural lands in the year 2000

Global Biogeochemical Cycles - Tập 22 Số 1 - 2008
Navin Ramankutty1, Amato T. Evan2, Chad Monfreda3, Jonathan A. Foley3
1Department of Geography and Earth System Science Program; McGill University; Montreal, Quebec; Canada
2Cooperative Institute for Meteorological Satellite Studies University of Wisconsin Madison Madison Wisconsin USA
3Center for Sustainability and the Global Environment (SAGE), Nelson Institute for Environmental Studies University of Wisconsin‐Madison Madison Wisconsin USA

Tóm tắt

Agricultural activities have dramatically altered our planet's land surface. To understand the extent and spatial distribution of these changes, we have developed a new global data set of croplands and pastures circa 2000 by combining agricultural inventory data and satellite‐derived land cover data. The agricultural inventory data, with much greater spatial detail than previously available, is used to train a land cover classification data set obtained by merging two different satellite‐derived products (Boston University's MODIS‐derived land cover product and the GLC2000 data set). Our data are presented at 5 min (∼10 km) spatial resolution in longitude by longitude, have greater accuracy than previously available, and for the first time include statistical confidence intervals on the estimates. According to the data, there were 15.0 (90% confidence range of 12.2–17.1) million km2 of cropland (12% of the Earth's ice‐free land surface) and 28.0 (90% confidence range of 23.6–30.0) million km2 of pasture (22%) in the year 2000.

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Global Biogeochemical Cycles

Tập 22 Số 1

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