ASTER GDEM与实测数据精度对比及其影响因素分析  

Comparative Analysis of the Accuracy between ASTER GDEM and Measured Elevation and Influence Factor Analysis

作　　者：李振林[1,2] 王晶[2] 

机构地区：[1]兰州交通大学,甘肃兰州730070 [2]甘肃省基础地理信息中心,甘肃兰州730000

出　　处：《测绘与空间地理信息》2013年第11期150-153,共4页Geomatics & Spatial Information Technology

摘　　要：ASTER GDEM是当前全球最新、空间分辨率最好的数字高程模型,应用范围较广,但目前对ASTER GDEM数据精度的研究较少。本文以实测1∶50 000DEM地形图数字化所得25 m×25 m空间分辨率的DEM数据为标准,在不同地貌类型下以坡度、坡向、起伏度为指标对ASTER-GDEM数据进行精度验证。结果表明在不同地貌类型下,ASTER GDEM的平均值、最大值、最小值都比实测值偏低。在此基础上,进一步分析了坡度、坡向、起伏度三种因子对数据精度的影响。结果表明:ASTER GDEM精度对地形起伏度及坡度依赖性较强。当起伏度、坡度越大时,ASTER GDEM与实测DEM的高程差异越大;不同坡向对ASTER GDEM影响不明显。就地貌类型而言,陇南山地对坡度和起伏度的敏感性要强于其他几种地貌,当坡度和起伏度增高时,陇南山地高程值的精确程度受到较大影响。ASTER GDEM was a kind of data for global DEM. It was up - to - date with high resolution and one kind of terrain data widely used by researchers. This study compared ASTER GDEM with 1 ： 50 000 DEM in Gansu and analyzed the factors influencing the height differences between ASTER GDEM and 1 ： 50 000 DEM. The results showed that ASTER GDEM has lower elevations com- pared with 50k DEM. The ASTERGDEM in strong dependence on slope and terrain relief. Height differences between ASTER GDEM and 1 ： 50 000 DEM increased with the increment of slope and terrain relief. Different slope directions has no obvious effect. Under dif- ferent landforms, Southern Mountain of Gansu is more Sensitivity than other landforms. When the slope and terrain relief increased. The accuracy of elevation values in Southern Mountain of Gansu is affected.

关 键 词：ASTER GDEM 1 50 000数字地形图 地貌类型 精度分析 

分 类 号：P208[天文地球—地图制图学与地理信息工程]