地图是转绘各种地震地质内容的依据。正确地掌握地图投影知识,对编绘地震地质图件是至关重要的。为此,本文仅就地图投影的某些技术问题谈一些看法。一地球是一个不规则的椭球体,通常用长半径(赤道半径)a、短半径(极点半径)b和扁率a=(a-b)/a,以及第一扁心率和第二扁心率这些元素来确定。现在要把地球表面这么一个不规则的曲面“硬压”到平面上,则必然会产生有的地方裂开,有的地方重叠,有的地方褶皱。这就叫变形,也叫误差。这种误差变形是不可避免的,而且变形是随着制图比例尺的缩小和制图区域的扩大而增大。因此,我们只能根 Map is to draw a variety of seismic geological basis. Proper grasp of the knowledge of map projection is essential for the compilation of seismic geological maps. For this reason, this article only talks about certain technical issues of map projection. An Earth is an irregular ellipsoid, usually with a long radius (equatorial radius) a, short radius (pole radius) b and oblateness a = (ab) / a, as well as the first flat heart rate and second flat heart rate of these elements to make sure. Now it is necessary to “hard-press” such an irregular surface on the surface of the Earth onto the plane, so some areas will inevitably be split, some will overlap, and others will be wrinkled. This is called deformation, also called error. This kind of error deformation is inevitable, and the deformation increases with the reduction of the drawing scale and the enlargement of the drawing area. Therefore, we can only root