北,对地图的编绘和使用都有着决定性的意义。因为作为方向和方位标准的北,在地图上不仅首先要确定,而且由始至终必须以此来确定逐地物的方位。但是,由于图的性质不同,成图方法不同,图上北的系统和标绘方法也不同。为此,我们林业地图的编绘就要讲究这个问题。 North, the mapping and use of maps are of decisive significance. Because north as a standard of direction and orientation, not only must it be determined on the map first, but it must be determined from the beginning to the end by the direction of the target. However, due to the different nature of the map, the drawing method is different, the north of the map system and the plotting method is different. Therefore, the compilation of our forestry map should pay attention to this question.