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当前,在土壤普查急需查清各类土壤及各种用地面积的时候,由于应用机械法求面积的求积仪奇缺,所以很需要在不同情况下切实可行的求面积方法。虽然对“称重法”有人提倡使用,但看法不一,因此有必要对达种方法进行介绍,並对精度作分析、探讨。“称重法”的道理很简单,它是求出在图纸上规整几何图形的面积,並称其重量,求出单位重量代表的面积(面积系数),再乘以所求区域面积的图纸重量,从而求出所求区域面积。如果要求得某一区域面积,可用透明纸或聚脂薄膜,蒙在该区域面积的平面图上,按边界描下来,随后用直尺(最好用方眼坐标尺)在该透明纸上绘制能夠容纳该区域面积的标准几何图形或坐标网格(如果被蒙底图是纠正过的航空照片平面图,可用图上已有的坐标网格)。
At present, when the soil census urgently needs to find out all kinds of soil and various kinds of land, it is very necessary to find the area method that is feasible in different situations due to the lack of the use of the mechanical method for determining the area. Although some people advocate the use of “Weighing Law”, they differ in their opinions. Therefore, it is necessary to introduce the method of introduction and to analyze and discuss the precision. The principle of “weighing method” is very simple. It is to find the area of regular geometric figure on the drawing, weigh its weight, find the area represented by unit weight (area coefficient), multiply the drawing weight , To find the required area area. If an area is required, use a clear paper or polyester film on a plan view of the area of the area, outline by the border, and draw on the clear paper with a ruler, preferably with a square eye scale, The standard geometry or grid of coordinates for the area of the area (or the grid of coordinates already available on the map, if the map is a corrected aerial photo plan).