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在森林清查工作中经常需要在地形图上确定象主点(象片中心点)的位置。我们都知道,一般说来垂直摄影的航空象片从象主点到任一点的连线不产生方向误差。根据这个道理,我们在象主点周围均匀地选择三个或更多的在地形图和象片上都能找到的明显地物,用透明纸法进行后方交会就能确定象主点在地形图上的位置。这是我们当前常用的方法(简称老法)。这个方法要求明显地物标较多,速度也较慢。现介绍一个方法可与老法配合使用。
In forest inventorying, it is often necessary to determine the location of the main point (the center of the image) on the topographic map. We all know that in general the aerial photograph of vertical photography does not produce a directional error from the connection from the principal point to any point. According to this principle, we select three or more obvious features that can be found on both the topographic map and the image evenly around the main point, and the backfill using the transparent paper method can confirm that the main point is on the topographic map s position. This is our current method (referred to as the old law). This method requires significantly more physical objects, slower speed. Now introduce a method can be used in conjunction with the old law.