搜索结果: 16-30 共查到“知识库 理学 DEM”相关记录43条 . 查询时间(0.751 秒)
Analysis and Tectonic Implication of DEM-Derived Structural Lineaments, Sinai Peninsula, Egypt
Sinai Peninsula Structural Lineaments Statistical Analysis
2013/3/11
Sinai Peninsula has fascinating geologic setting and is displaying a diversity of structural lineaments that have greatly influenced the distribution of natural resources and hazards. Shaded relief im...
DEM拟合级配碎石材料大三轴试验的颗粒粗糙度效应研究
级配碎石 大三轴试验 颗粒形态 粗糙度
2013/11/12
为充分利用石质弃渣,填石路堤已经成为山区高等级公路较普遍的路堤形式,为确保填石路堤的稳定性,急需开展弃渣碎石材料性质的研究。为研究颗粒粗糙度对样本性质的影响,本文以雅泸路某隧道废弃碎石的室内大三轴试验数据为基础,开展离散元法模拟级配碎石材料大三轴试验的颗粒粗糙度效应研究。论文详细介绍了样本颗粒形态及粗糙度的模拟原理、级配碎石数值样本的生成过程。分析数值试验过程及结果表明:团粒形态样本可以更真实地模...
Geology and Geomorphology of the Manipur Valley Using Digitally Enhanced Satellite Image and SRTM DEM in the Eastern Himalaya, India
Imphal Valley Remote Sensing and Geographical Information Systems
2013/3/11
Landsat ETM+ data and SRTM DEM data were used to delineate the geological, structural and geomorphological features in the intermontane Imphal Valley in Manipur, India. This area has simple geology, s...
Synergetic Use of Satellite Image and DEM for Identification of Landforms in a Ridge-Valley Topography
Geomorphology Resourcesat-1 ASTER India
2013/3/8
Multispectral satellite image and digital elevation model (DEM) have emerged as the primary data sources for the mapping of landforms. They offer an opportunity to gain a fresh insight into the geomor...
Optimal Scale Selection for DEM Based Slope Segmentation in the Loess Plateau
Optimal Scale Multiresolution Slope Segmentation Loess Plateau
2013/3/7
Optimal scale selection is the key step of the slope segmentation. Taking three geomorphological units in different parts of the loess as test areas and 5 m-resolution DEMs as original test date, this...
Analysis of Constructing 3-Dimensional Virtual Scene Technique Based on DEM
DEM GeoVRML GIS Server Terrain Analysis Virtual Reality Geographical Information System
2011/12/20
High resolution DEM(Digital Elevation Model, DEM) is created based on original CAD terrain map (one reservoir as example). Then the article offers precision analysis、topographic factors analysis、visib...
Incremental response of granular materials: DEM results
discrete element simulation incremental behavior elastoplasticity flow rule hardening
2010/11/18
We systematically investigate the incremental response of various equilibrium states of dense 2D model granular materials, along the biaxial compression path (s11 ements are...
Preface "LIDAR and DEM techniques for landslides monitoring and characterization"
LIDAR DEM techniques landslides monitoring characterization
2010/10/21
Preface "LIDAR and DEM techniques for landslides monitoring and characterization".
The SRTM DEM, a digital elevation model based on the Shuttle Radar Topography Mission of February 2000 is a source of elevation data with nearly worldwide coverage. It has proven its usefulness in var...
基于DEM的秦岭数字地貌格局研究
秦岭 格网精度 地理信息系统 数字地貌格局
2009/11/2
基于格网精度为100 m×100 m的DEM数据，应用地理信息系统技术和栅格分析方法，研究秦岭数字地貌格局.首先提取秦岭的主分水岭，作为秦岭南北坡的参考分界线；确定秦岭地貌的分类分级指标，并确定4 km2为秦岭地势起伏度的最佳统计单元；对秦岭的起伏度和高度数据进行分类、编码后，经过数据融合后得到秦岭的数字地貌格局.结果分析表明，利用精度较高的栅格数据，得到秦岭15种地貌组合的空间分布特征，与前人研...
基于DEM的堰塞湖1／3溃决模拟及人员撤离方案研究
DEM 堰塞湖 1／3溃决 人员撤离
2014/1/7
建立了堰塞湖1／3溃决下,洪水的水流速度、淹没区域及到达时间等模型.根据模型,利用DEM(三维数字高程模型)和MATLAB软件模拟了汶川地震唐家山堰塞湖1／3溃决后的洪水演进情况,设计了“人员撤离紧迫性”的量化方法,拟订了下游人员撤离方案,为部队和政府相关部门撤离群众提供了数据支持.最后对模型的精确性进行了评价,针对地震堰塞湖应急评估中存在的数据不足、时效性较差等问题提出了建议.
DEM-RS-GIS BASED STORM RUNOFF HYDROGRAPH ESTIMATION FOR THE HEART RIVER SUB-BASIN, MISSOURI RIVER BASIN
Remote sensing Normalized Difference Vegetation Index geographic information system
2009/10/12
Accurate representation of the physical and biological features of the landscape within the watershed is required as the extent and type of watershed cover affects the movement of water in the hydrolo...
流径算法是分布式水文模型、土壤侵蚀模拟等研究中的关键技术环节，决定着汇水面积、地形指数等许多重要的地形、水文参数的计算。本文以黄土高原两个典型样区的不同分辨率DEM为研究对象，对常用的五种流径算法（D8、Rho8、Dinf、MFD和DEMON）通过相对差系数、累积频率图、XY散点分布图等进行了定量的对比分析。结果表明：算法的差异主要集中在坡面区域，汇流区域各类算法的差别较小；算法差异在不同DEM...
基于DEM的地貌实体单元自动提取方法
DEM 地貌单元 数字提取
2009/9/16
我国传统地貌基本形态类型分类强调地貌单元的完整性，界线划分沿地貌实体边界而非规则统计单元，目前尚缺乏地貌实体单元的有效自动提取方法。针对这一难点，本文提出一种基于DEM的地貌实体单元数字提取方法。利用坡度分级，并搜索相邻栅格单元、计算坡度级别内相互连通栅格的面积，建立坡度、面积阈值综合判别规则进行山地平原的自动划分；利用地形倒置、水文淹没分析，将山体划分的二维判别规则扩展到实际三维地形中，并结合地...
InSAR与ICEsat测高技术作为极具潜力的两项对地观测技术，各有其特点，利用卫星激光测高数据对星载SAR干涉测量DEM进行倾斜改正具有十分重要的意义，为提取无控制特殊困难地区大范围DEM提供了一种全新的方法。本文介绍了InSAR与ICEsat激光测高两种技术的特点及互补性；分析了利用ICEsat测高数据改正InSAR数据本身难以消除的误差的可行性；并以南极Grove山大范围DEM的提取为例，证...