与雷达和声纳技术相似,激光雷达的工作原理是通过向目标发射电磁波然后根据反射波构建图像。
In the case of lidar, the waves are in the form of an infra-red laser beam.
拿激光雷达来说,其波形采用的是红外激光束。
And in the case of the forests of south-western Nepal,the target is the trees.
以尼泊尔西南部的森林为例,被测目标就是树木。
During a forest survey, an aircraft-borne lidar sweeps a beam that fires about 70,000pulses a second over the canopy.
在森林探测过程中,载有激光雷达的飞机将每秒产生7万个脉冲的激光束向森林树冠进行扫掠,
A sensor on the aircraft records the time it takes to receive the backscattering of pulses, andthat is used to compute distances to the forest canopy and to the soil beneath.
同时安装在飞机上的探测设备会记录收到脉冲反向散射波的时间,然后分别用于计算到树林冠部及到土壤的距离。
The result, when processed through the computers of Arbonaut, a Finnishnatural-resource-management company, is a three-dimensional image of the forest thatcan be correlated with, and calibrated by, the efforts of the chaps with the tape measures.
经过芬兰自然资源管理公司的Arbonaut计算机进行数据处理后,便可生成与采用卷尺那帮家伙的测量结果相关并可校验的树林三维图象。
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