照相法结合数字图像技术计算植被覆盖度精度研究  

Accuracy and Feasibility Analysis of Plant Coverage Measurement by Overhead Photograph and Image Processing

作　　者：路炳军[1] 刘洪鹄[1] 符素华[1] 章文波[1] 袁爱萍 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875 [2]北京市水土保持工作总站,北京100038

出　　处：《水土保持通报》2007年第1期78-80,85,共4页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金重点项目(40235056);国家教育部博士点基金项目;国家自然基金课题(40201031)

摘　　要：植被覆盖是影响土壤侵蚀的一个重要因子，植被覆盖度的测量精度直接影响到土壤侵蚀模型参数的滤定或侵蚀量的估算。用0．1m×0．1m的绿色硬纸块铺设在面积已知的水平小区和坡度小区上模拟植被覆盖，用自行设计的照相装置对铺有模型的小区进行垂直照相。用GIS软件IDRISI分类计算和Photoshop软件环境下目视解译提取照片植被覆盖度。试验结果表明，这2种方法计算得出的覆盖度与实际覆盖度相差不大，分类计算得出覆盖度的绝对误差在0．6％～4．3％之间；从绝对误差的最小值、最大值、均值和方差来看，目视解译值比分类计算值更接近于实际覆盖度，但考虑到工作量和植被覆盖度计算精度的要求，选择GIS软件IDRISI来进行照片植被覆盖信息的提取是可行的。Plant coverage is a very important ecological index, and it is essential for predicting soil loss quantitatively. Two plots covered with green paper cards as simulated plant were measured by overhead camera in order to analyze errors of the method. Comparison between computed results and actual plant coverage degree shows that the overhead photograph combined with image processing is an accurate and fast method to measure plant coverage degree.

关 键 词：植被覆盖度 照相法 精度 

分 类 号：P208[天文地球—地图制图学与地理信息工程]