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Accuracies of global land cover maps Checked against Fluxnet Sites

Science Foundation in China 2008年第1期16卷 31-35页

作者： Peng Gong Department of Environmental Science Policy and Management University of California Berkeley State Key Laboratory of Remote Sensing Science Jointly Sponsored by Institute of Remote Sensing Applications Chinese Academy of Sciences and Beijing Normal University Beijing 100101

global land cover data products are key sources of information in understanding the complex interactions between human activities and global change. They play a critical role in improving performances of ecosystem, hydrological and atmospheric models. Three freely available global land cover products developed in the United States are popularly used by the scientific community. These include two global maps developed separately by the United States Geological Survey （USGS） and the University of Maryland （UMD） with NOAA Advanced Very High Resolution Radiometer （ AVHRR ） data, and one developed by Boston University with the EOS Moderate Resolution Imaging Spectroradiometer （ MODIS） data. They are compared with known land cover types at 250 available Fluxnet sites around the world. The overall accuracies are 37%, 36% and 42%, respectively for the USGS, UMD and Boston global land cover maps, Some future global land cover mapping strategies are suggested.

关键词： global land cover map

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A method characterizing urban expansion based on land cover map at 30 m resolution

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Science China Earth Sciences 2016年第9期59卷 1738-1744页

作者： YU Xi ZHANG BingQi LI Qiang CHEN Jin College of Resources Science and Technology Beijing Normal University State Key Laboratory of Earth Surface Process and Resources Ecology Beijing Normal University

Based on the global land cover data at 30 m resolution(Globe land30) in the year 2000 and 2010, the urban expansion process of 320 cities in China was analyzed using lognormal regression, and the expansion model were established. Three metrics were presented for the models, including the peak position, the full width at half maximum, and the skewness. It was found that the three metrics could reveal different patterns of the urban expansion process of cities with different sizes. Specifically, cities with larger size tend to expand outward strongly, and their expansion intensity and influence are likely to be higher. Moreover, most cities' expansion occurs around the urban core with spatially limited influence. In addition, it was also found that the city's expansion intensity is related to the city size. These results showed that the lognormal regression model could describe the distribution of urban expansion with effectiveness and robustness.

关键词： Urbanization Urban expansion Remote sensing Lognormal distribution Characteristic metrics global land cover map

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