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森林资源二类调查各类土地面积来源于调绘的基本图,以小班为单位逐级控制求算。计算精度时应考虑误差产生的因素,选用适宜的公式求算误差值,衡量调查面积与实际面积的精度。各林分蓄积量,都是先测得某林分单位面积的蓄积量,再乘以该林分的面积而得总的蓄积量,在计算精度时应考虑材积表误差,面积误差和单位面积蓄积量误差,以衡量林分蓄积量实际精度。
The second category of forest resources survey of various types of land area derived from the basic map of the transfer to small class as a unit level control calculation. When calculating the precision, the factors of the error should be considered. The appropriate formula is used to calculate the error value, and the accuracy of the survey area and the actual area is measured. The stock volume of each stands is measured first, and then multiplied by the area of the stand to obtain the total volume, in the calculation accuracy should consider the volume table error, area error and unit area Accumulation error, to measure the actual accuracy of stand volume.