我们将PostGIS数据归类为矢量数据，其原因将在下文介绍。
For reasons you'll see later, we classify PostGIS data as vector data.
应用程序使用两种不同的数据结构存储GIS数据：栅格数据和矢量数据。
Applications store GIS data using two distinct data structures: raster data and vector data.
矢量数据指的是通过几何结构定义的数据，如线段表示街道，而点表示位置。
Vector data refers to data defined by geometric constructs, such as line segments representing a street or points representing single locations.
几何矢量形状通常称为特征，指的是特征数据，它与矢量数据或形状数据是一个意思。
Geometric vector shapes are often called features, leading to the term feature data, which is synonymous with vector data or shape data.
该库为编程人员提供了通用的数据模型，包括所有栅格数据格式和矢量数据格式（通过OGR）。
The library gives programmers a common data model covering all raster data formats and -- through OGR -- vector data formats.
详细介绍矢量数据和属性数据的采集。
Acquisition of vector data and attribute data is introduced in detail.
提出了基于矢量数据的三维航迹规划方法。
A three-dimensional path planning method based on vector data is presented.
提出基于地图矢量数据面状地物变化检测的流程。
Putting forward the change detection flow of areal ground features based on vector map data.
每个工具执行特定的地理信息系统矢量数据的分析。
矢量数据的访问就是对层表中空间数据字段的读写操作。
Data access is through reading and writing the data storing in spatial column of layer table.
注记信息的存在使得从专题图自动获取矢量数据具有一定难度。
It is difficult to automatically and accurately extract vector data from thematic map because of annotations.
导入和导出矢量数据及栅格数据，实现多种GIS数据格式之间的转换。
Import and export vector and raster data, convert between different GIS data formats.
分析工具箱的设计目标是在地理信息系统(GIS)中进行矢量数据分析。
The analysis toolbox was designed to perform analysis of vector data in a geographic information system (GIS).
该技术旨在将扫描的工程图像转换为与CAD系统相兼容的矢量数据格式。
Engineering drawing recognition technique aims at converting scanned engineering drawing images into vector formats compatible with CAD systems.
并基于等高线矢量数据建立不规则三角网，再内插格网生成DEM点阵数据。
A triangulated irregular network(TIN) is constructed based on vector data, and DEM point-array data is computed by interpolating grid on TIN.
矢量数据拓扑关系的自动建立是GIS软件的核心模块之一，也是技术难点之一。
It's one core module and nodus to create topological relationship automatically in GIS software.
以南京市规划局矢量地形图数据建库为例，详细地描述了矢量数据入库的处理过程。
According to the spatial database building in Nanjing planning bureau, this article describes the process of data loader for vector data.
基于平面欧几里得图和抽象胞腔复形理论，提出了街道网矢量数据的渐进式表达模型。
A progressive representation model for street networks of vector data was presented based on the theory of plane Euclidean graph and abstract complex cell.
在该部分，以ORACLESPATIAL为例，讨论了矢量数据模型的简单数据结构；
The simple data structure of vector model is introduced using the ORACLE SPATIAL as an example.
论述了从地形图中提取等高线、对等高线矢量化以及通过矢量数据生成高程数据的实现方法。
In this paper, the methods of drawing contour line from terrain map, the vector of contour line and generating elevation data from vector data are discussed.
详细论述了基于模板阴影体算法矢量数据绘制的关键技术，并通过试验验证了该方法的有效性。
The key techniques of the rendering of vector data over 3d terrain based on stencil shadow volume algorithm are detailed and the effectiveness of this method is test-proven.
把空间矢量数据的压缩方法道格拉斯-普克法引入到断面数据的抽稀处理中，并对算法进行改进。
This paper introduced the method of vector data compression-Douglas-Peucher algorithm into profile data compression and improved the algorithm.
在总结现有的矢量数据向栅格数据转换算法的基础上，提出一种面积误差最小约束下的优化算法。
Based on summarizing the existing algorithms of transferring vector data to raster data, an optimization algorithm is proposed.
把空间矢量数据的压缩方法道格拉斯-普克法引入到断面数据的抽稀处理中，并对算法进行改进。
The thesis introduces the method of vector data compression-Douglas-Peucker algorithm into profile data compression, and makes the improvement to the algorithm.
矢量数据要求的存储要比栅格数据少得多，因为弧节点列表简化并减少了表示地图中包含的特征所需的数据。
Vector data require far less storage than raster data because arc node lists simplify and reduce the data required to make sense of the features contained in the map.
多元统计分析的主成份分析方法是对多维矢量数据提取主要特征分量，以此达到压缩矢量维数的目的。
The principal component analysis in multivariate statistic analysis is a method of compressing the dimension of vector data by extracting principal typical components from sample data set.
实验结果证明，本文提出的度量方法更符合矢量数据的特点，能够得到比现有方法更准确的度量结果。
Experiment results indicate that the proposed metric fits the characteristic of vector map data better and, furthermore, it can achieve more reasonable measuring results than previous methods.
简言之，矢量数据利用最简单的拓扑实体—点、线和多边形，并在二维笛卡尔坐标系统中固定它们来描述地理特征。
In short, vector data take the simplest topological entities — points, lines, and polygons — and anchor them within a 2-d Cartesian coordinate system to describe geographical features.
提出一种基于模板阴影体算法的矢量数据绘制方法，实现矢量数据在三维场景中的高质量实时叠加显示。
The key technique of vector data render based on stencil shadow volume is discussed and is proved by experiments.
当前GIS中矢量数据的投影变换已日趋成熟，而栅格数据的投影变换的研究与应用还需要进一步的深入。
Map projection transformation of vector data is becoming mature presently, but research and application of raster data projection transformation in GIS needs further efforts.
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