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求面积的方法很多,如座标行列式法、几何法、方格法、辛普逊法和求积仪计算法等,但就其实用和精度方面,都不如纵距和法好。根据测量精度要求,林区境界线容许闭合差为1/1000,分区线容许闭合差为1/500,罗针仪碎部测量容许闭合差为1/200。用什么方法求算面积才不致于降低测量精度,我们进行了长时间摸索。从理论上说,用座标行列式法计算面积精度应该是最高的,但实践结果证明,并不理想。因林地多是山区,各种界线常是按自然区划,实际地形不规整,测点与测点之间并不是直线,凹凸部份的面积,往往不能互相抵补,虽经过长时间大量的计算,效果仍然不佳。几何法、方格法虽然计算简单,但精度低。辛普逊法精度虽高,然而计算十分复杂,难于采用,无实用价值。用求积仪计算,
There are many ways to find the area, such as coordinate determinant, geometric method, square method, Simpson method, and heliostat method, but not as good as the vertical distance and the method in terms of practicality and accuracy. According to the requirements of measurement accuracy, the allowable closing difference of forest border line is 1/1000, the allowable closing difference of partition line is 1/500, and the allowable closing difference of the compass of the needle roller instrument is 1/200. What method to calculate the area will not reduce the measurement accuracy, we conducted a long trial and error. Theoretically, the accuracy of the area calculated by the coordinate determinant method should be the highest, but the result of practice shows that it is not ideal. Due to the woodland is mostly mountainous, all kinds of boundaries are often according to the natural divisions, the actual terrain is not regular, measuring point and measuring point is not a straight line, uneven area, often can not offset each other, although after a long time a large number of calculations, The effect is still not good. Geometry, although the calculation of square grid method is simple, but low accuracy. Although Simpson’s method has high precision, it is very complicated to calculate and hard to adopt, so it has no practical value. With the plotter calculation,