ICESat/GLA14最新数据与V33数据的对比

摘要/Abstract

摘要： ICESat/GLA14是具有较高精度的海拔高程点，以吕梁山为研究区，对该区域内ICESat/GLA14 v33和ICESat/GLA14 v34数据进行了高程差统计，并对其随地形因子、NDVI和土地利用类型的不同分类所发生的变化进行了统计分析。结果表明：高程值<2 000 m时，高程差绝对误差均值相对稳定，当高程值在2 000～3 500 m时，绝对误差均值在逐渐增大，随着坡度的不断增加，高程差均值由0.004 m逐渐上升到0.009 m，在平坦区域高程差均值为0.002 m，在其他区域为0.007 m，高程差在植被覆盖区均值和标准差相对较高，即高程差随着高程增加、坡度的上升逐渐增大，且该数据在平坦区域精度明显较高，同时受植被覆盖影响较大。

关键词: ICESat/GLA14, 吕梁山, 地形因子, NDVI, 土地利用

Abstract: ICESat/GLA14 is a series of high accuracy altitude point. Taking Lvliang Mountain,Shanxi Province, China as the study area,the vertical error of ICESat/GLA14 v33 and ICESat/GLA14 v34 data were analyzed firstly, both the mean value and standard deviation were less than 0.01 m. Then the paper analyzed the vertical error distribution changes with different topographical factors(elevation,slope and aspect),different NDVI and landuse classes. The results show when the elevation is lower than 2 000 m,the mean absolute error of vertical error is stable,but increasing when the elevation is between 2 000 m to 3 500 m. With the increasing of slope,the mean value of vertical error rises from 0.004 m to 0.009 m. The mean value of vertical error in flat area is 0.002 m,but 0.007 m in other areas. Both the mean value and the standard deviation of vertical error are high when the land is covered with vegetation. In other words,with the increasing of elevation and slope,the vertical error increases; the accuracy of the data is high in flat area;at the same time,it is greatly influenced by vegetation. According to the results,we proposed three possible reasons:(1) the new variable,GmC(Gaussian vertical control point), which is the value applied to correct the G-C elevation problem discovered in releasing v33 and is defined as the difference in the transmit pulse Gaussian fit and the centroid of the transmit pulse;(2) atmospheric delay,that is, many other substances contained in the atmosphere will result in uneven refractive index,which further leads to refraction,scattering and delay in the process of laser pulse propagation;(3) ICESat laser footprint contains the information of vegetation,surface and many other features which may easily result in the distortion of a single element study. The aim of the study is to make a deep understanding about the quality of ICESat/GLA14 in Lvliang Mountain.

Key words: ICESat/GLA14, Lvliang Mountain, topographic, NDVI, landuse

中图分类号:

P237

王莉, 赵尚民. ICESat/GLA14最新数据与V33数据的对比[J]. 干旱区地理, 2016, 39(5): 1104-1110.

WANG Li, ZHAO Shang-min. Comparsion of the Latest and V33 ICESat/GLA14[J]. , 2016, 39(5): 1104-1110.

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