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部颁《林林资源调查主要技术规定》第十五条(七)面积量算中指出:“按照‘层层控制、分级量算、按比例平差’原则进行。”层层控制要求必须是用较高精度的总体面积来控制次级森林区划单位的面积,而控制总体面积则是调查区总体所在各幅地形图图幅现地面积的总和的一部分,那么,每一幅地形图图幅现地面积是最主要的基础数据。现谈谈地形图图幅现地面积计算方法,供参考。一、数学公式计算方法用若干条子午线将椭圆的地球表面按经
The ministerial “forest resources survey main technical requirements,” Article XV (g) area calculation points out: “in accordance with the ’layer control, grading calculation, according to the principle of proportional adjustment’.” The layers of control requirements must be Controlling the area of sub-prime forest zoning units with a higher-precision total area is part of the sum of the area covered by the topographic map panels in the survey area as a whole, then each topographic map sheet The current area is the most important basic data. Now talk about topographic map sheet area calculation method for reference. First, the mathematical formula for calculating the number of meridians will oval surface of the earth according to by