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在森林抽样调查中,有时以地形图公里网的交点作为样地点,在现地调查时要用像片识别这些点。因此,事先须将地形图上的公里网点转到象片上,其方法可用辐射三角测量点反求。1.在像片上确定个别公里网点图1为地形图的一部分,K为需在像片上确定的某一公里网点。在K点周围,选择三个(至少2个)地物点A、B、C,并在像片对1、2上确认这些点其相应点为a、b、c(图2)。再将两块透明板(或透明纸)分别放在像片对上,绘出这些点的辐射线,并进行辐射交绘。
In the forest sampling survey, the intersection of the topographic map km network is sometimes used as a sample site, and in the spot survey, the spots are identified by photos. Therefore, in advance on the topographic map must be transferred to the kilometer on the site, the method can be used to triangulate the radiation triangulation. 1. In the picture to determine the individual kilometer outlets Figure 1 is part of the topographic map, K is to be identified in the picture of a kilometer network. Around point K, select three (at least two) features points A, B, and C and confirm the points a, b, and c on the pair of photos 1 and 2 (Figure 2). Then two transparent plates (or transparent paper) were placed on the photo pair, draw the radiation of these points, and radiation mapping.