3种IGBP分类系统的土地覆盖数据在韩江流域的对比分析  

Comparative Analysis on Three Land Cover Datasets based on IGBP Classification System over Hanjiang River Basin

作　　者：刘远[1] 周买春[1] 

机构地区：[1]华南农业大学水利与土木工程学院,广东广州510642

出　　处：《遥感技术与应用》2017年第3期575-584,共10页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目(41171029);广东省水利科技创新项目(2009-42)

摘　　要：土地覆盖是陆面过程模型、生态水文模型的重要输入,对模拟结果影响较大。针对基于IGBP分类系统的土地覆盖数据IGBP DISCover、MODIS和MICLCover,以韩江流域为研究区域,分析了3种数据土地覆盖空间分布,通过人工判读样地Google卫星影像对其精度进行了评价。结果表明:IGBP DISCover土地覆盖类型少,空间变异性小,而MODIS和MICLCover类型多,空间变异性大;从大类看,3种数据土地覆盖空间分布较吻合;3种数据林地划分存在明显差异,其中MICLCover林地成分较好地反映了流域实际情况;MODIS和MICLCover耕地面积与流域实际相符,IGBP DISCover耕地面积明显偏大;3种数据建设用地、裸地、湿地和水域的面积较实际小,说明1km的空间分辨率过粗,不能细致反映流域中面积较小或较分散的土地覆盖,尤其是IGBP DISCover数据。Google卫星影像样地检验表明,MICLCover精度明显高于IGBP DISCover和MODIS,IGBP DISCover的主要错误是将许多其他土地覆盖划分为耕地,而MODIS的主要错误是将许多其他土地覆盖划分为草地。Land cover data is an important input for land surface process models and eco-hydrological models.It has a significant influence on the simulation results. Three IGBP land cover classification system based datasets,including global data IGBP DISCover and MODIS,and recent China data MICLCover, were compared and evaluated over Hanjiang River basin.Their spatial distributions were compared in the basin and accuracies were assessed by identifying Google satellite images in sample sites. For IGBP land cover, land cover types of IGBP DISCover are fewer and its spatial variability is smaller than that of MODIS or MICLCover.But for big classes, their spatial distributions match well.The components of woodlands classi- fied by the three kinds of land cover data are quite different.Only MICLCover corresponds to the reality of the basin.The area of croplands classified by MODIS or MICLCover corresponds to the reality of the basin, while the croplands area of IGBP DISCover is much larger.The areas of urban,barren,wetlands and water bodies classified by the three kinds of land cover data are smaller than the reality of the basin, especially for IGBP DISCover,because resolution of 1kin is not high enough to describe the land cover types which are small in area or distribute dispersedly.Accuracies assessment by identifying Google satellite images in sample sites shows that classification accuracy of MICLCover is much higher than that of IGBP DISCover or MODIS.In IGBP DISCover,the main error is that many other land cover types are classified as croplands, while many are classified as grass in MODIS.

关 键 词：土地覆盖 IGBP分类系统 遥感 韩江流域 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] S127[自动化与计算机技术—控制科学与工程]