航空数字摄影测量对林分立木测高及精度分析

为了解决以往森林调查手段需要在野外工作,并且比较耗费人力、物力与时间的问题,本文提出用航空摄影立体像对数字摄影测量的方法来估测林分立木高度。本研究利用两张廊坊市自然公园拍摄比例尺为1∶2500的航空像对,构建数字立体模型,在此模型上测量50株样木的高度,并结合实地用全站仪实测得出的数据进行精度的分析评价。结果表明:利用航空立体像对数字摄影测量立木高度,与全站仪实测数据相比差异不显著,两组数据呈线性正相关关系,精度达到93.96%,与林业调查上95%的精度要求较为接近。

Stand tree height measured by digital photogrammetry

Aiming to settle manpower cost,material cost and time consuming of forest investigation in the field,this paper studied high measurement of forest stand by digital photogrammetry.In this study,two stereo images of Langfang City Park with scale of 1∶ 2500 were used to build a three-dimensional digital model.In the model,50 samples tree heights were measured,combined with the field measured data to carry out analysis and evaluation of accuracy.The results showed that the tree heights by digital photogrammetry were no significant differences with the measured ones,two sets of data were linear correlation with accuracy of 93.96 percent,which was close to 95 percent of Forest Inventory accuracy.