| environ. |
co-ordinate system A reference system used to measure horizontal and vertical distances on a planimetric map. A coordinate system is usually defined by a map projection, a spheroid of reference, a datum, one or more standard parallels, a central meridian, and possible shifts in the x- and y-directions to locate x, y positions of point, line, and area features. A common coordinate system is used to spatially register geographic data for the same area (在平面图上用来测量水平和垂直距离的参考系统。一个坐标系统的定义通常由地图投影、参考之球状体、资料、一条或多条标准平行线、一条中央子午线以及用于确定点、线和的x、y坐标在x和y轴方向的平移位置所。一般的坐标系统用于记录相同区域的空间地理资料。) |
