成功案例-1宁波点云-航摄图片-吉林省通用航空有限公司

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成功案例-1宁波点云

作者：发布于：2015/12/21 13:56:49 点击量：

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　　Chiroptera Carried Ocean and Land Laser Radar Mapping System

　　•Jilin General Aviation introduced the Leica Chiroptera carried underwater and land multifunctional laser scanning system in May 2013 .

　　•Multiple sensors;

　　•Integrating sensors for 35kHz sounding laser, 500kHz land laser dual LiDAR and 80 megapixel high resolution medium frame air survey camera

　　•Multifunction:

　　Proficient in many types of tasks, such as obtaining the submarine relief, coastal zone, land relief, high resolution multispectral image etc.

　　•Precise and fast:

　　Acquire the underwater and land relief and image data within 15m in one flight by virtue of the 300m scanning width.

　　•Acquisition efficiency of underwater relief: 95km2/h

　　•Acquisition efficiency of land relief: 400km2/h

　　Technical parameters

Laser data acquisition features
Sounding laser	35kHz blue-green laser pulse, full waveform recording
Land survey laser	0-500 kHz adjustable near-infrared laser pulse, full waveform recording
Flight altitude range of operation	For underwater sounding, 400-600m; for land survey, below 1600m (relative flying altitude)
Sounding range note 1	Dmax = 2.2 /k (approximately 1.5 times the Issa-like depth)
Scan method	Elliptic scanning
Field angle	14 degrees on the front and back, 20 degrees on the left and right
Laser scanning width	Relative flying height x 70%
Density of laser point note 2	Sounding laser: 1.5 points/m2; land laser: 12 points/m2
Underwater sounding accuracy note 2, note 3	0.15m (2 σ)
Land survey accuracy note 2, note 3, note 4	Vertical accuracy: 2cm (1 σ); horizontal accuracy: 20cm (1 σ)
Optical camera feature
Monitoring camera	5 mega-pixel, 2448 x 2050 pixels, 1 frame/sec
Leica RCD30	80 mega-pixel, 10320 x 7752 pixels, 1 frame/sec
Professional areophoto camera (optional)	Pixel dimension 6 μm, RGB and near-infrared spectrum
Physical and operation interfaces
Inertial navigation and positioning system	LCl-100-Litef IMU (no output limit)
Flight control software	Leica FlightPro
Mission planning software	Leica MissionPro
Data post-processing	LiDAR Survey Studio software package 　　Leica FramePro image processing software 　　SPAN Inertial Explorer – GNSS/IMU processing software
Storage capacity	Shock-proof SSD, over 8h of continuous recording
System weight	70kg (including the whole system)
Operating temperature	0 - +35 ℃
Storage temperature	-10 - +50 ℃
Power supply requirement	18-23V DC, 30A@28V DC
Built-in battery module	Large capacity battery module, providing 30min of operation for GNSS/IMU system without external power

　　Note 1: k is the scattering coefficient of water quality generally between 0.1-0.5. Lower value of k indicates better water quality. The bottom reflection rate is taken is 15%.
　　Note 2: Based on the relative flying height of 400m and flying speed of 60m/sec. Higher relative flying height will reduce the accuracy correspondingly.
　　Note 3: 2σ indicates two standard deviations in statistics, namely, the probability of falling in the accuracy range is 95%; 1σ indicates that the probability of falling in the accuracy range is 68%. RMSE is equivalent to 1σ.
　　Note 4: Vertical accuracy is the laser ranging accuracy excluding the GNSS/IMU system error.
　　Note 5: Horizontal accuracy is the laser pointing accuracy excluding the GNSS/IMU system error.
　　The equipment was applied to the general survey project of national conditions of Ningbo. The large density of point cloud and high precision obtained the consistent recognition of the users in and outside the province.
　　The data result of point cloud of Ningbo is shown below.

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