多源遥感土地覆被产品在欧洲地区的一致性分析

Agreement analysis of multi-sensor satellite remote sensing derived land cover products in the Europe Continent

土地覆被的空间分布格局及其动态变化对于全球变化、区域可持续发展等研究具有重要意义,卫星遥感是唯一能够快速获取大尺度区域土地覆被信息的方法。基于GLOBCOVER2005、GLOBCOVER2009、GLC2000、MODIS2000等4种全球卫星遥感土地覆被产品,研究其在欧洲地区的一致性。结果表明：① 4种产品对于欧洲土地覆被构成特征的刻画基本一致,即以耕地、林地为主,以草地、水体、灌丛等其他类型为辅;② 4种产品对耕地、林地识别的混淆程度最低、一致性最好,对草地、灌丛、裸地识别的混淆程度最高、一致性最差;③欧洲有75%的土地具有较高的一致性。斯堪的纳维亚半岛东侧及北欧地区、中欧—东欧大平原及巴黎盆地等地区的一致性最好,斯堪的纳维亚半岛西侧、科拉半岛、伯朝拉河—新地岛、伊比利亚半岛以及伏尔加河流域下游等地区的一致性最差;④ 4种产品两两比较时,参考精度大致在38.56%-77.65%之间。GLOBCOVER2009/GLOBCOVER2005组合的参考精度最高,反映出土地覆被变化所引起的误差远小于不同制作机构、不同数据源、不同判读方法所引起的制作误差。

The information about land cover and its dynamic change is essential for the global change and regional sustainable development studies. With the development of remote sensing and land cover interpretation technology, the land cover information derived from satellite remote sensing imagery become the only way to obtain land surface information effectively and economically, especially in large-scale regions. Free global land cover products, e. g.GLOBCOVER2009, GLC2000, MODIS2000, GLOBCOVER2005, are now popularly used by worldwide scientists in many diverse fields. To get a cross-referenced research results, it is fundamental and critical for secitists to pre-estimate the accuracy of each land product and preassess the consistency of different land products in a specific region. Supported by the above 4land cover products, this study aims at analyzing the consistency and heterogeneity, by using area correlation analysis, mix-up pixs analysis, spatial consistency analysis, and reference precision analysis methods. The results show：（1） The 4 land cover products have similar descriptions about the the construction of European land cover. Cropland and forestland are the dominant land cover types, followed by grassland, water body and other land cover types.（2）Cropland land and forest land have the lowest mix-up ratios and the highest consistencies, while the grassland, shrubland, and bareland have the highest mix-up ratios and low consistencies.（3）There are 75% land area in Europe owing a relative high consistency, which means at least 3products indicate the same type among all 4 products. Specifically, in the Eastern Scandinavian Peninsula, the Central-eastern Europe plains, and the Paris basin, there are higher consistency.While in the western Scandinavian Peninsula, the Kola Peninsula, the northern Pechora Riversouthern Novaya Zemlya, the Iberian Peninsula and the downstream region of Volga river, there are lower consistency among different products.（4） The reference precision between different land cover products ranges from 38.56% to 77.65%. The group of GLOBCOVER2009/GLOBCOVER2005 has the highest reference precisions, which refers the error caused by land changes is largely smaller than the error caused by the interpretation process due to different institutions, sensors, land classification systems, and interpretation methods.