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作为计算坡向变率的数据基础,坡向矩阵具有方向性,以标量的方式计算带有方向属性的数据,将带来计算方式的误区及计算结果的偏差。本文以数学高斯曲面和不同黄土地貌样区5 m分辨率DEM数据为基础,针对坡向数据具有方向性的特点,设计基于数学向量的坡向变率计算方法。首先针对坡向数据进行极坐标转换,形成坡向矩阵的向量几何表达;然后以该坡向向量数据为基础来计算坡向变率;最后将本文方法的计算结果与传统标量方法的计算...
Despite of valuable efforts from working groups and research organizations towards flood hazard reduction through its program, still minimal diminution from these hazards has been realized. This is ma...
In web based GIS visual simulation systems, the DEM multi-scale presentation and lossy-to-lossless progressive compression and transmission based on integer-to-integer wavelet transforms can eliminate...
In order to simplify the generalization of contour lines during the compilation of maps at smaller scales, an indirect method is put forward based on the generalization of the corresponding DEM first ...
For realistic modelling of digital elevation model (DEM) uncertainty, information on the amount and spatial configuration is needed.However, common DEM products are often distributed with global error...
Multi-criteria evaluation (MCE) method has been applied much in groundwater potential mapping researches. But when to data scarce areas, it will encounter lots of problems due to limited data. Digital...
The fusion respectively the homogenisation of the digital terrain models of the federal states (L鋘der) of Germany to a nationwide digital elevation model for Germany is described. The aim is a nation...
A high-resolution Digital Elevation Model (DEM) (10m meshed grid) has been integrated with Geographic Information Systems (GIS). So far, 50m-meshed DEM by the Geological Survey of Japan (GSJ) is widel...
This paper analyzes the potentials offered by the TanDEM-X mission for the generation of urban DEMs. Operationally acquired urban Raw DEMs are validated using as reference a LiDAR DEM. The approach us...
The TanDEM-X mission will derive a global digital elevation model (DEM) with satellite SAR interferometry. Two radar satellites (TerraSAR-X and TanDEM-X) will map the Earth in a resolution and accurac...
Topographic attributes are often used as explanatory variables when providing spatial estimates of various environmental attribute response variables. Elevation of sampling locations can be derived fr...
High resolution data have high relief displacement in hilly terrains. Development of Digital Elevation model helps to assess bio resources more accurately in such terrains. While estimating bio resour...
Singhbhum Shear Zone (SSZ) is a geologically rich belt with structures like faults and folds being the distinctive features. Due to these characteristics this area has been an important centre of stud...
准确有效去除干涉纹图中的平地相位是精确重建DEM的关键。探讨了两类常见的去平地相位方法(基于地理定位和基于干涉频谱),分析了其所引起的误差影响。通过Envisat和JERS-1两种数据的验证结果表明: 在可获取精密轨道数据的情况下,基于地理定位的去平地方法能够有效去除干涉纹图中所包含的平地相位,并很好地控制最终所得的DEM误差,其效果优于基于干涉频谱的去平方法; 基于干涉频谱的去平方法在干涉频谱平...
基于美国SRTM-DEM数据,利用彩色晕染、密度分割与GIS空间统计分析等技术,并结合地质资料,通过地形高程、地表坡度 及地形剖面等分析手段,对阿尔泰山的构造地貌特征进行初步分析。研究表明,阿尔泰山脉平均海拔约1 790 m,平均坡度约21° ,其高海拔与高坡度的现代地貌特征,主要与强烈的断裂构造活动有关; 山脉严格受到以北西向为主的断裂构造活动的影响与控 制,其发育的构造地貌单元基本上呈北...

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