The previous three-dimensional geological maps are the expansion of the two-dimensional digital geological map in Z-axis on the use of digital terrain model ( DEM), And then with Digital Orthophoto ( DOM) overlay, which formed the so-called "2.5D" model.

Autodesk Civil 3D as software platform, will use memory mapping technology, the memory pool, triangulation technology and data rendering technology to achieve three-dimensional digital terrain model.

以Autodesk Civil3D为基础软件平台，具体将采用内存映射文件技术、内存池技术、三角剖分技术、数据渲染技术等来实现三维数字地形模型。

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The principles and approaches for building Digital Terrain Model ( DTM) of GIS are presented. The test generates Digital Elevation Model ( DEM) with the distance weighted average interpolation of shifting imitation for dispersed elevation points.

介绍了GIS数字地形模型（DTM）的构造原理和方法，用离散点移动拟合距离加权平均插值方法生成了GIS数字高程模型（DEM）。

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To generate regular grid digital terrain model ( DTM) from scattered points, the key problem is to improve the efficiency of searching neighbor points.

从离散点内插规则格网数字地形模型（DTM）方法的关键是如何提高待插点周围数据的搜索效率。

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By introducing the Digital Terrain Model ( DTM) to computer aided subgrade design ( subgrade CAD) system, the problem about how to design the drainage facilities by computer automatically can ho solved effectively.

将数字地形模型引入路基设计CAD中，可有效地解决路基排水设施的设置等关键问题；

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The method of generating DTM is examined in detail. An optimal algorithm is designed to create a Delaunay TIN with constraint of feature lines.

着重研究了数字地形模型中的TIN生成算法，给出了带特征线约束的Delaunay三角网最优算法的研究及实现。

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Digital terrain model ( DTM) is an important component of a resource information system.

数字地形模型（DTM）是资源信息系统中的重要组成部分。

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Regular grid, as one common description method of the digital terrain model, is widely used in many fields.

规则格网（Grid）是数字地形模型（DTM）最常用的表示方法，有着广泛的应用。

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Inter-Visibility Algorithms on TIN Digital Terrain Model

TIN数字地形模型的通视性算法

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Establishment of digital terrain model of GIS and its application

GIS数字地形模型的建立及应用研究

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The Digital Terrain Model Establishment of Lianyungang Channel by using GIS

面向GIS的连云港市航道数字地形模型建设

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Study on Faster Algorithm for Constructing Delaunay Triangulations DTM

高效构建Delaunay三角网数字地形模型算法研究

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The technique for acquisition of DTM data and an analysis of its precision

数字地形模型数据获取方法及精度分析

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This system has functions of editing and updating data of space and attribute, searching and querying information,( displaying) and zooming vector data, buffer analysis and making specific maps, etc.

该系统的主要功能是空间与属性数据的编辑与更新，信息的检索与查询，矢量数据的显示、缩放、漫游，缓冲区分析以及专题图制作等。

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In detail, the paper discusses how to use the spatial decision analysis methods and the spatial analysis technologies in GIS especially network analysis and buffer analysis to perform regional tourism decision.

其中详细讨论了采用地理信息系统的空间决策分析方法、空间分析技术包括网络分析和缓冲区分析技术来进行区域导游决策。

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This paper studies on the overlap analysis, buffer analysis and spatial statistical analysis methods to analyze the spatial distribution features, spatial distribution change and region relativity.

在空间分析方法上，本文采用了叠加分析、缓冲区分析、空间统计分析等方法，对耕地供给变化的空间分布特征及空间分布变化趋势以及区域相关性进行分析。

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It also has the following functions: zoom-in, zoom-out and roam of map, buffer_zone analyzing, measuring perimeter and area of certain zone on the map.

可以实现地图的自由放大、缩小、漫游及缓冲区分析，可以量测不同区域的周长、面积；

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Meanwhile, the paper analysis the transportation stand and the public transportation line using the buffer analysis method, which realize the function of information inquiry.

同时利用缓冲区分析方法对公交站点及公交线路进行分析，实现系统查询功能。

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Spatial information analysis: to change from vector format to grid format, buffering section analysis, spatial data overlap analysis, net analysis, etc.

空间信息分析：包括矢量转栅格、缓冲区分析、空间数据的复合分析、网络分析等。

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The gradation is obtained using Arc/ Info and the evaluation unit are decided through buffer area analysis of traffic and penstock and multi-layers overlapping.

利用Arc/Info软件矢量化提取相关图层后，对道路、水渠作缓冲区分析和多图层叠加确定评价单元；

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Part four; it analyzed the impact of urban road construction on the woodland landscape pattern by using the buffer zone analysis method.

第四部分，运用缓冲区分析法，分析城市道路建设对城市林地景观格局的影响。

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