中国区域多源土地覆被遥感产品类别精度探索性分析

分析了GLOBCOVER，MODIS COLLECTION5，GLCNMO和GLC2000四种数据在中国区域的类别精度、空间一致性及类别均质性空间分布特征，结果表明:四种全球土地覆被遥感数据与参考数据存在一定的混淆现象，混淆主要发生于林地、草地、灌木和耕地之间，其中灌木与其他地类的混淆程度最为严重；四种数据完全空间一致性区域主要位于以林地、耕地、草地为主的光谱特征较为显著区域，其总面积约占研究区域总面积的39.03%；较为一致区域主要分布于完全一致区域周围，该区域的面积约占研究区总面积的40.67%，该区域主要地表类型为草地和裸地以及耕地为主；不一致区域的面积约占研究区总面积的18.56%，该区域地表类型较为复杂，地表景观呈现明显的破碎现象，耕地、林地、灌木、草地交错分布；完全不一致区域约占研究区总面积的1.74%，并且集中分布于胡焕庸地理分界线两侧，成典型的带状分布特征；四种土地覆被遥感数据的空间均质性谱图整体上趋于一致，主要分布于中国的华北平原、西北沙漠地区和东南地区。图谱表明，各地表土地覆被类别在中国西南地区的均质性区域几乎消失，这主要是因为该区域地表景观过于复杂，表现出强烈的景观异质性。本文为用户合理利用这些数据提供科学合理的依据，为多源土地覆被数据融合提供了必要的先验知识。

Exploratory Analysis of Category Accuracy for Multi-Sources Land Cover Products

We evaluated the category accuracy and confusion characteristic of four kinds of land cover products on national scales, then constructed the spatial agreement and spatial homogeneity map and their quantitative relationships with category accuracy. The results showed that validated products and reference data had some categorical confusion which mainly occurred in forest, grass, shrub and cropland, especially between shrub and other categories, so shrub had the worst category precision; the large homogenous regions of the forest, cropland, grass and bare land showed almost complete agreement, and this areas almost took up 39.03 percent of the whole study area, Areas of high agreement were often adjacent to areas of full agreement and they occupied about 40.67 percent, grassland, bare land and cropland were the dominant land cover categories there; areas of low agreement showed the banded distribution characteristics, which was mainly located in the center of southeast, northwest of Tibet alpine zone and the district of northwest and northeast boundaries, areas of no agreement was mainly located around the Hu Huanyong geographical boundaries, occupied about 1.74 percent of the whole study area; spatial homogeneous maps of four land cover products showed the overall consistency, these regions were mainly located in North China Plain, northwest desert area and southeast area. The map demonstrated that the homogeneous of all categories almost vanished in China’s southwest region because of the complexity of these regions and the strong landscape heterogeneity.