1.Digital Terrain Model (DTM) is a way of digitized presentation for terrain information, DTM suited for railway engineering is called strip digital terrain model, it is foundation and core to locate railway line by computer, Engineers can locate best line project easily and design automatically for horizontal plane, vertical plane, cross-section of railway line in office.
数字地面模型(Digital Terrain Model简写DTM)是地形信息的数字化表示,适合于铁路工程的数字地面模型又称为带状数字地面模型。 数字地面模型技术是铁路数字化选线的基础和核心,利用这一技术工程师们可以在室内进行铁路线路多方案比选和平、纵、横自动化设计。
2.The Visualization Research of 3D Terrain is an important part of Virtual battlefield environment, Geographic Information System(GIS),Digital Photographing(DP) and Remote Sensing System(RS). It is a subject mainly research on Digital Terrain Model(DTM) or the simplification, display and simulation of Digital Elevation Terrain ,it is a subject of Computer Graphics.
三维地形可视化是虚拟战场环境、地理信息系统(GIS)、数字摄影测量(DP)和遥感系统(RS)的重要研究内容，它是一门以研究数字地形模型(Digital Terrain Model，DTM)或数字高程域的简化、显示、仿真等为内容的学科，属于计算机图形学的一个分支。
3.The high precision terrain data in the STK/Terrain modul is used as data sources, which is converted to the OpenFlight format model that Creator or Vega can discriminated .
以STK/Terrain 模块中的高精度地形高程数据作为数据源,将其转换成Creator 和Vega 能识别的OpenFlight 格式模型;
4.Digital Terrain Analysis (DTA) is a topographical information analysis technology to calculate and extract terrain surface parameters and morphological features on Digital Elevation Model(DEM), and the application of DEM is extended by DTA.
数字地形分析(Digital Terrain Analysis，DTA)是在数字高程模型DEM上进行地形属性计算和特征提取的数字地形信息处理技术，是DEM应用范围的拓广和延伸。
5.This paper discussed digital terrain model (DTM) .
论述了地面数字模型DTM(Digital terrain model).
6.Digital Terrain Model display two demission geographic position and relational properts information with digital pattern. DTM is an important component of Gis,and is basic of "digital earth".
数字地面模型(Digital Terrain Model,DTM)是地表二维地理空间位置和其相关的地表属性信息的数字化表现，是地理信息系统(Geographic Information System,GIS)的重要组成部分，是数字地球的基础。
7.For the purpose of battlefield terrain simulation, in order to solve the problem of building and real-time display of large scale terrain, designed and developed a 3D terrain model database of missile force virtual training, optimized the model with its key technology, such as levels of detail, texture mapping etc, and proposed a solution for real-time display of large scale terrain based on view-point and double measurement which has been successfully applied into the simulation training of missile force.
摘要以战场地形仿真为目的，针对某导弹阵地大规模地形生成与实时显示问题，设计开发了适用于某导弹部队虚拟训练的三维地形模型数据库，采用层次细节、纹理映射等关键技术对模型进行优化处理，提出基于视点的双度量法实时显示大规模地形，将将其成功应用于某导弹部队虚拟训练中。
8.This paper puts forward the formulas of numerieal method for electromagnetic respond intwo-dimentional terrain in VLF electromagnetic field and discusses the regularities of electromagneticanomaly in two-dimentional terrain,especially the effect of overburden thickness and resistance,thelimitation of terrain correction with simplified formulas is also pointed out.
本文推导了甚低频电磁场中二维地形响应的数值计算公式，讨论了二维地形电磁异常的规律，特别是覆盖层厚度和电阻率的影响，指出了用简化公式进行地形改正时的局限性。
9.By surveying the sample plot ,the relations between the stabil ity of the mountai n slope of soil preparation for planting by using explosion and other factors s uch as precipitation,terrain，were studied.By using the method of Quantitative T heory I,the interrelation between the damaged degrees of soil preparation progra ms by using explosion in low mountain area with abundant precipitation and terrain factors was systematically analysed,and the mathematical models relate d were developed.The results show that the precipitation in early days and the m aximum precipitation per day are the primary factors causing the soil prepara tion program damaged.The main terrain factors of the mountain slope that affect the program stability are according to their importance ,slope ,position and dir ection.The suitable mountain slope for soil preparation by using explosion is th e slope of less than 25°.
通过典型标准样地调查资料，探讨了造林爆破整地工程的坡地稳定性与降水、地形等因子的相互关系，应用数量化理论Ⅰ，对在有充分降水条件下的低山丘陵区的爆破整地工程损失程度与地形因子之间的关系进行了系统分析，并建立了相应的数学模型，研究指出，充分的前期降水和日最大降雨量是引起爆破整地工程损失的激发因素；影响爆破整地工程稳定性的主要地形因子是地面坡度，其次为坡位、坡向，实施爆破整地工程的地面坡度以不超过25°为宜。
10.The research emphases of the paper include the establishment of terrain model and the realization of detail of surface. During the establishment of terrain model, the theory of fractal and the characteristics of IVS, fractal Brown motion (fBm) are discussed and compared, and prove the model is adapt to the feature of the physiognomy. The fractal model of terrain is established based on the theory of IVS.
地形模型的建立和地表细节的表现是本文研究工作的重点，在建立地形模型的过程中，分析了分形理论和分形法中的随机插值、布朗运动(fBm)的原理并进行比较，论证了其数学模型与真实地貌特征基本吻合，并运用随机插值法(Insert-value stochastically,IVS)实现了地形的分形模型。
