Digital vector map has great economical value and strategy significance for its accurate content.
数字矢量地图的地理信息详实准确，具有巨大的经济价值和战略意义。
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.
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。
Efficiently compressing vector map data is the basic requirement of an embedded GIS.
满足功能并对矢量地图数据进行高效压缩，是嵌入式GIS系统的基本要求。
Putting forward the change detection flow of areal ground features based on vector map data.
提出基于地图矢量数据面状地物变化检测的流程。
Digital watermarking technology is a common scheme to secure the copyright of digital vector map.
数字矢量地图水印技术是一种解决数字矢量地图版权保护问题的常用手段。
Based on the difference expansion and difference shifting, a novel reversible watermarking algorithm for digital vector map is proposed.
利用差分平移和差分扩张，提出一种新的应用于数字矢量地图的可逆水印算法。
Firstly, the request of vector map data is summarized, such as color-setting standard, attribute definition of topographic feature, etc.
首先对入库的矢量图形数据要求做了概述，如要素的分层设色标准、地形图要素属性项定义等；
And its fabricating cost is huge. On the other hand, illegal copying and stealing of digital vector map are becoming increasingly rampant.
同时，数字矢量地图制作成本极高，针对数字矢量地图的非法拷贝、窃取等侵权行为也日益猖獗。
Both geographical objects topology construction and mutual operation between GIS vector map and remote sensing images are mainly discussed.
重点就地物目标拓扑构造和GIS矢量地图与遥感图像互操作问题进行了讨论。
Some energy based metrics, e. g. peak signal to noise ratio (PSNR), have some limitations while applied to vector map watermarking systems.
峰值信噪比(PSNR)等基于能量的度量指标在应用于矢量地图水印系统时具有一定的局限性。
This article explained the importance of vector map in GIS, and analyzed the error in the vector map transformed from paper map in practicality.
从实用的角度出发，阐述了矢量地图在GIS领域中的重要性，并对由纸制地图生成的矢量地图的误差来源进行了分析。
It is the basic function for GIS to get unit polygon by overlaying the vector map, but the uncertainty of polygon is the disastrous factor affecting GIS's data quality.
用矢量基础图件叠加来获取单元图斑的方法是GIS的基本功能，但叠加多边形的不确定性成为影响GIS数据质量的灾难性因素。
Data encryption is a main means to keep data in safety. Concerning the characteristics of vector map data, the paper presents an encryption algorithm based on chaotic sequence.
加密技术是保障数据安全的最主要的手段，结合矢量地图数据的特点，设计了一种基于混沌序列的数据加密算法。
An analytic expression for the intensity of the central point in Fresnel's circular aperture diffraction was derived using the methods of vector map and integration respectively.
分别用矢量图解法和积分法导出了菲涅耳圆孔衍射中心场点的光强的解析表示，方便了此类问题的分析。
Putting forward the change statistic method based on acreage, and counting the varieties of vector map data by using polygon intersection of vector data and changed pixel of raster data.
提出基于面积的变化统计方法，分别利用矢量数据的多边形交集和栅格数据的变化像素来统计地图矢量数据的变化。
Similarly, the rows represent Clojure's built-in collection types: list, vector, map, and set.
同样，行表示Clojure的内置集合类型：list、vector、map和set。
Similarly, the rows represent Clojure's built-in collection types: list, vector, map, and set.
同样，行表示Clojure的内置集合类型：list、vector、map和set。
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