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DEM地表坡向变率的向量几何计算法
DEM 坡向变率 坡向 向量几何法
2019/11/25
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...
INFLUENCE OF DEM IN WATERSHED MANAGEMENT AS FLOOD ZONATION MAPPING
GIS DEM Drainage Pattern Flash-Floods Hydrological Model Stream Network Flow Accumulation
2016/11/30
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...
The Selection of Reversible Integer-to-Integer Wavelet Transforms for DEM Multi-Scale Representation and Progressive Compression
DEM Multi-scale Representation Compression Geographical Services Web Based
2015/12/16
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...
An Indirect Generalization of Contour Lines Based on DEM Generalization Using the 3D Douglas-Peucker Algorithm
Cartography GIS, Algorithm DEM/DTM Geomorphology Global Generalization
2015/11/23
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 ...
MODELLING DEM DATA UNCERTAINTIES FOR MONTE CARLO SIMULATIONS OF ICE SHEET MODELS
GIS DEM/DTM Error Correlation Impact Analysis Modelling Reference Data Glaciology
2015/9/28
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...
Extract relevant features from DEM for groundwater potential mapping
DEM Groundwater potential Multi-criteria evaluation (MCE) Area under curve (AUC) GIS
2015/7/27
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 Digital Elevation Model 1:25.000 (DEM 25) for The Federal Republic of Germany
Fusion DEM/DTM Multiresolution
2015/7/9
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...
APPLICATION OF HIGH-RESOLUTION (10M) DEM ON GEOGRAPHIC INFORMATION SYSTEMS
Remote Sensing GIS DEM/DTM High resolution Graphics
2015/6/1
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...
TOWARDS AN URBAN DEM GENERATION WITH SATELLITE SAR INTERFEROMETRY
SAR Interferometry TanDEM-X Urban Digital Elevation Models
2014/4/29
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 GLOBAL TANDEM-X DEM: PRODUCTION STATUS AND FIRST VALIDATION RESULTS
TanDEM-X DEM InSAR Global Calibration Mosaic Block Adjustment Validation
2014/4/29
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...
GPS- vs. DEM-Derived Elevation Estimates from a Hardwood Dominated Forest Watershed
Forest Canopy Cover Linear Regression Spatial Estimates
2013/3/5
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...
Orthorectification and Digital Elevation Model (DEM) Generation Using Cartosat-1 Satellite Stereo Pair in Himalayan Terrain
DEM Cartosat Stereo Pair Orthorectification Himalaya
2013/3/5
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...
ASTER DEM Based Studies for Geological Investigation around Singhbhum Shear Zone (SSZ) in Jharkhand, India
RS-GIS ASTER DEM Singhbhum Shear Zone (SSZ) geological structure
2013/3/5
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...
InSAR平地相位去除算法及其对DEM精度影响研究
雷达干涉 平地相位 轨道数据
2009/11/24
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...