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在土壤普查面积量算中,常用的方法有平行线法、方格法、三角法、割补法、求积仪法、称重法等。由于土壤图斑多是弧线不规则图形,其面积是一个无理数,虽其近似计算方法多,但因条件和技术要求等方面的原因,效果各异。这些方法(方格法除外)都有一个共同点,即某区域内各图斑之和不等于该区域用公里网控制下计算出的总面积(不考虑图纸的比例误差),有的甚至相差很大,造成区域总面积的二元性,影响资源统计和资料汇总。为了尽可能使图斑量算面积逼近其理论面积,并在这一前提下加快量算速度,我们就格点法与求积仪法,称重法作了量算应用上的试验比较。
In the calculation of the area of soil census, commonly used methods are parallel line method, square method, trigonometry method, cutting method, quadrature method, weighing method. Due to the fact that the soil spots are mostly irregular arcs, the area is an irrational number. Although there are many approximate calculation methods, the effects are different due to the conditions and technical requirements. These methods (except for the grid method) have one thing in common: the sum of the speckles in a certain area does not equal the total area calculated under the control of the kilometer network in this area (without considering the proportional error of the drawings), and some even differ Large, resulting in the duality of the total area of the region, affecting resource statistics and data aggregation. In order to make the area of the figure measure as close to its theoretical area as possible, and to accelerate the calculation speed under this premise, we make the comparison of the test of the application of the grid method and the method of the quadrature and the weighing method.