点线面状地图符号定义的简化与统一

The simplify and unify of point,line and area Map symbol definition

从制图物体到地球椭面的映射f,椭球面到主体认识结构的映射g和主体认识结构到二维平面的映射q三重拓朴映射的存在性入手,推导了地图符号的一般表达式。再从点状、线状和面状地图符号均以图的某一部分为定位依据的共同特征,推导了简化的点状、线状和面状地图符号的数学定义,从而使这三类地图符号获得了简化和统一。

In this paper began with existence of three topologic mappings that the mapping f from the cartographic bodies to the earth ellipsoid surface, the mapping g from the earth ellipsoid surface to body knowledge construction and the mapping q from body knowledge constraction to two dimensiond plane, the authors inquire into the general express formula of map symbol. Abain from the common character of location on the basis of point, line and area map symbol all with some part of figure lead to simplify mathematical definition of point, line and area map symbol, therely, can be used these three map symbols get simplify and unify.