Characterization of ASTER GDEM elevation data over vegetated area compared with lidar data

作     者：Wenjian Ni Guoqing Sun Kenneth J.Ranson 

作者机构：State Key Laboratory of Remote Sensing ScienceInstitute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina Department of Geographical sciencesUniversity of MarylandCollege ParkMDUSA Biospheric Sciences BranchNASA’s Goddard Space Flight CenterGreenbeltMDUSA 

出 版 物：《International Journal of Digital Earth》 (国际数字地球学报（英文）)

年 卷 期：2015年第8卷第3期

页      面：198-211页

核心收录：

学科分类：08[工学] 09[农学] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0708[理学-地球物理学] 0804[工学-仪器科学与技术] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术] 081602[工学-摄影测量与遥感] 0835[工学-软件工程] 0704[理学-天文学] 0811[工学-控制科学与工程] 081102[工学-检测技术与自动化装置] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：This work was partially supported by the National Basic Research Program of China(Grant no.2013CB733404) the National Natural Science Foundation of China(Grant nos.41001208 and 91125003) support for the study was also provided by the NASA Terrestrial Ecology Program(NNX09AG66G) 

主　　题：vegetation canopy height ASTER GDEM NED photogrammetry stereo-mapping 

摘      要：Current researches based on areal or spaceborne stereo images with very high resolutions(1 m)have demonstrated that it is possible to derive vegetation height from stereo *** second version of the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model(ASTER GDEM)is the state-of-the-art global elevation data-set developed by stereo ***,the resolution of ASTER stereo images(15 m)is much coarser than areal stereo images,and the ASTER GDEM is compiled products from stereo images acquired over 10 *** forest disturbances as well as forest growth are inevitable in 10 years time *** this study,the features of ASTER GDEM over vegetated areas under both flat and mountainous conditions were investigated by comparisons with lidar *** factors possibly affecting the extraction of vegetation canopy height considered include(1)co-registration of DEMs;(2)spatial resolution of digital elevation models(DEMs);(3)spatial vegetation structure;and(4)terrain *** results show that the accurate coregistration between ASTER GDEM and national elevation dataset(NED)is necessary over mountainous *** correlation between ASTER GDEM minus NED and vegetation canopy height is improved from 0.328 to 0.43 by degrading resolutions from 1 arc-second to 5 arc-second and further improved to 0.6 if only homogenous vegetated areas were considered.