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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...
Cartography;Extra-terrestrial;Planetary;Mars;High Resolution;DEM/DTM;Camera;Mapping
Saturn Icy Satellites Cassini Planetary Mapping
2015/12/17
The Saturnian system contains more than 50 satellites of different sizes. This paper deals with the mapping and the cartography of the so-called medium-sized icy satellites Mimas, Enceladus, Tethys, D...
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...
Research on a Correction Method to Existing Grid-based DEM
DEM Feature Data Structure Surface Method
2015/11/24
The existing grid-based DEM has several disadvantages in representing the features of real terrain surface, such as peak clipping, channel filling, etc. And abrupt changes in elevation cannot be handl...
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...
ALGORITHM DEVELOPMENT FOR THE ENHANCEMENT OF PHOTOGRAMMETRIC DIGITAL IMAGES TO IMPROVE DEM GENERATION
Photogrammetry digital images
2015/3/24
In digital photogrammetry applications such as digital elevation model generation (DEM), demanding highly detailed images, it is
often not feasible or sometimes possible to acquire images of such hi...
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...