摘要
分析了常见的电子地图投影变形特征,提出了一种间断性变更标准纬线的非固定倍率瓦片索引方法。该方法在瓦片索引过程中,通过自动变更标准纬线来减小地图投影的变形程度。该方法在长度变形、角度变形和面积变形方面均具有整体变形较小的特点。在区域性电子地图表达中具有良好的变形可控性,具有较高的应用价值。
This paper analyzed the common electronic map projection distortion,and proposed a discontinuous change of the standard parallel for map tiles＇ indexing method based on the equidistant cylindrical projection.This indexing method sets angle deformation at the standard parallel as 0 and reduce the deformation by custom defined standard parallel and changing it automatically.Through computing and comparing the length deformation,angle distortion and area deformation of this method and others,it shows that this method have moderate deformation characteristics and also have good deformation controllability in regional electronic map.Therefore,this indexing method will have a high practical value.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2012年第1期122-125,131,共4页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(41101449)
武汉大学数字制图与国土信息应用工程国家测绘局重点实验室开放研究基金资助项目(GCWD200903)
关键词
电子地图
瓦片索引
标准纬线
投影变形
electronic map
tiles index
standard parallel
projection deformation
