MAPGIS地图参数与显示打印之关系浅析

Relationship between the MAPGIS Map Parameters and Displaying Printing

地图参数是MAPGIS图形编辑系统中的重要参数,包括坐标系类型、椭球参数、投影类型、比例尺、单位、高程、经纬度、投影带类型及序号、平移图幅范围等信息。可以通过导入标准文件、手工修改、在工程里修改等3种方法改变地图参数。地图参数影响到MAPGIS图件的实际表现效果(如形状、大小、外观等),而显示参数则仅是鼠标读取的坐标数值不同。通过实例分析了地图参数、显示参数、整图变换与图件打印和输出间比较密切的关系,得出打印的图元大小等于参数比例与图元参数大小的乘积的结论。

As important parameters in MAPGIS graphical editing system, Map parameters includes coordinate type, ellipsoidal parameter, projection method type, scale, units, elevation,longitude and latitude, type and number of projection zone, translation map range, etc. Three methods are available for altering map parameters： input standard files, manual changes and revisions to engineering documentation. Map parameters could influence actual effect of MAPGIS maps, in shape, size, appearance, and so on, while displaying parameters are coordinate values by mouse. By the example analysis of close relationship to map parameters, displaying parameters, whole map translation, and map print and output, it is suggested that metafile pixel value equal to the product of parameters proportion and pixel parameters.