多源卫星遥感土地覆被产品在南美洲的一致性分析

Agreement Analysis of Multi-source Land Cover Products Derived from Remote Sensing in South America

针对不同卫星遥感产品在不同区域缺乏一致性基准的问题,提出类型构成相似性、类别混淆程度、空间一致性及参考程度等4种方法,对比分析不同土地覆被产品间的一致性。鉴于南美洲区域土地覆被空间结构和变化对全球变化研究具有重要意义,利用上述4种方法研究了GLOBCOVER2005、GLOBCOVER2009、GLC2000、MODIS2000、GLOBELAND30-2010等5种全球卫星土地覆被产品在南美洲地区的一致性。结果表明,5种产品对于南美洲土地类型的构成刻画基本一致,且对林地识别的一致性最高;南美洲有近60%的土地具有较高的一致性;5种产品两两比较时,参考精度大致在42.27~87.59%之间,GLOBCOVER2009/GLOBCOVER2005组合的参考精度最高,反映出土地覆被动态变化所引起的误差远小于不同制作机构、不同数据源、不同判读方法所带来的制作误差。

According to the problem about different satellite remote sensing products lacking consistency benchmark in different regions,four methods were presented including category composition similarity,category confusion degree,spatial consistency and reference degree analysis,and different land cover consistency between products were comparatively analyzed.In view of land cover spatial structure and change in South America has important significance for global change research,this paper used the above four methods to study the consistency of five kinds of global land cover products in South America.The results showed that the land cover products have similar descriptions about the construction of South American land cover,and have the highest consistency of woodland identification;there are 60% land area in South America owing a relative high consistency;the reference precision between different land cover products ranges from 42.27% to 87.59%.The group of GLOBCOVER2009/GLOBCOVER2005 has the highest reference precisions,which refers the error caused by land change is largely smaller than the error caused by the interpretation process due to different institutions,sensors,land classification systems,and interpretation methods.