期刊论文

Liu, P.(liupc3000@qq.com)

中文

测绘学报

1001-1595

2012

41

2

284-290

2009AA121404:国家高技术研究发展计划（863计划） 41001229:国家自然科学基金 GCWD201005:数字制图与国土应用工程国家测绘局重点实验室开放研究基金

本校为第一且通讯机构

矢量地图渐进式传输的关键技术是建立连续的多尺度表达模型,并在服务器端将地图数据组织成线性结构。提出一种用于网络环境下的等高线渐进式传输模型,此模型以曲线的傅里叶形状描述子构建数据流,在客户端以先期到达的低频参量构建等高线的形状轮廓,其后依次到达的高频参量不断"完善"等高线形状细节,从而实现等高线由粗到精的渐进式传输。该模型的应用具有两大特点:其一,傅里叶形状子数据流与由坐标构成的数据流相比数据量大为降低,能减少数据的传输量;其二,能够实现连续尺度的地图要素的渐进式传输与表达。另外,本文还建立了不同等高线的傅里叶展开项数与比例尺的匹配方法,探讨等高线傅里叶形状...

The key technology of progressive transmission for vector map is the model establishment of successive multiple representations of spatial data and the line-structure organization of map data in the server. An algorithm for progressive transmission of vector contour data on the internet was brought, which built data-stream using Fourier-descriptor, then rough sketch of contour was restricted with the initial low-frequency data, and gradually the detailed part of contour would be added by higher-frequency data on the browser site, so the progressive transmission and representation of contours c...