As global change is becoming serious, the global land cover data sets which the global change research needs have become more and more important. The current global land cover data products mainly include five products which are produced by European and U.S. The global land cover data sets produced by Boston University (i.e. MODIS data sets) and by European Space Agency with global cooperation (i.e. Globcover data sets), which are somehow better and more effective than the others, are used more and more widely. Because of the difference of data sources, classification systems and classification methods, there are significant differences between two land cover data sets both in quantity and spatial distribution. In this study, as a products' user, we compared the MODIS and Globcover data sets in Heilongjiang Basin on the quantity and spatial distribution, using LANDSAT TM / ETM + images and field photos to verify the accuracy of the classification of two data sets. The results show that, in Heilongjiang Basin, there are great differences in the quantity and spatial distribution between the two data sets. As to the quantity, the main land cover types (forest and cropland, followed by grassland) in both data sets are similar. When it comes to the spatial distribution, they are of great difference. The two data sets are both of low precision, with a precision of only 60%. The Globcover data sets is more clustering than MODIS data sets, and the overall accuracy is slightly lower than MODIS data sets, while the accuracy of different land cover types is different. Taking into account the representation of Heilongjiang Basin, we believe that Globcover data sets and MODIS data sets are able to meet lower demand for land cover information. This study provides a basis for global change research in selecting the appropriate data sets.
NING Jia , ZHANG Shuwen, CAI Hongyan, BU Kun
. A Comparative Analysis of the MODIS Land Cover Data Sets and Globcover Land Cover Data Sets in Heilongjiang Basin[J]. Journal of Geo-information Science, 2012
, 14(2)
: 240
-249
.
DOI: 10.3724/SP.J.1047.2012.00240
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