电子经纬仪测量立木材积误差分析

发布时间：2018-02-26 10:45

本文关键词： 电子经纬仪立木材积树高误差传播定律　出处：《农业机械学报》2015年01期 　论文类型：期刊论文

【摘要】：以北京市杨树立木材积实测数据作为检核真值,按误差传播定律对电子经纬仪测树误差进行分析,并依据我国电子经纬仪精度划分的Ⅰ(DJ1)、Ⅱ(DJ2)、Ⅲ(DJ6)和Ⅳ(DJ15)4个等级,计算该方法测量树高和材积的误差和2倍中误差的极限误差,分析不同精度电子经纬仪测树的差异性和适应性。结果表明:由于误差的传播和累积,同一精度电子经纬仪测量材积的误差大于树高。同一精度电子经纬仪测量不同规格样木时,误差会随着树木大小的变化而略有差异。随着电子经纬仪测角标准偏差的变大,测树的误差也会变大。电子经纬仪标准偏差为±0.5″时,测量树高和材积的中误差分别为±6.550 0×10-2m和±1.474×10-3m3,相对误差分别为0.44%和0.73%。电子经纬仪标准偏差为±15.0″时,测量树高和材积的中误差分别为±8.927 5×10-2m和±4.385×10-3m3,相对误差分别为0.60%和2.14%。说明我国现有的Ⅰ~Ⅳ级电子经纬仪测树结果均符合相对误差不超过3%~5%的精度要求,可以满足不同林业调查工作的需要。
[Abstract]:In Beijing, Yang set timber volume data as a check of the true value, according to the error propagation law of electronic theodolite measurement error is analyzed, and based on China's electronic theodolite precision Division 1 (DJ1), II (DJ2), III (DJ6) and IV (DJ15) 4 grades, limit error the error calculation of the measurement method of tree height and volume and 2 times in the analysis of accuracy of electronic theodolite tree diversity and adaptability. The results show that due to the error propagation and error accumulation, with a precision electronic theodolite measuring volume is greater than the height. The same precision electronic theodolite with different specifications like wood, the error will change with tree size and slightly different. With the electronic theodolite standard deviation becomes larger, the error measurement also becomes larger. The electronic theodolite standard deviation is 0.5 ", the error in the measurement height and volume is + 6.5500 * 10-2m respectively. And + 1.474 * 10-3m3, the relative error is 0.44% and 0.73%. respectively the electronic theodolite standard deviation is 15 ", the error in the measurement height and volume were + 8.9275 and + 4.385 * 10-2m * 10-3m3, the relative error is 0.60% and 2.14%. respectively shows that our existing I ~ IV electronic theodolite the results are consistent with the requirements of measuring relative error is less than the precision of 3%~5%, can meet the different needs of forestry investigation work.

【作者单位】：北京林业大学精准林业北京市重点实验室;北京工业大学建筑工程学院;俄亥俄州立大学地球科学学院;
【基金】：国家自然科学基金资助项目(41371001)
【分类号】：S758.1;TH761.1

【共引文献】