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High-accuracy and light-small airborne remote sensing system

1. Flight Test and Verification with Domestic High-accuracy POS

 

A. Date of testing: May 27th, 2011

                            May 28th, 2011

                            July 28th, 2011

 

B. Testing equipment: Domestic laser 50 POS+SWDC-4+Stabilized Platform

 

C. Testing situation: Design the same or different flights strips in the working area. Use two ways of aerial triangulations and POS calibration in order to get image exterior elements separately.

 

The analysis of the accuracy is as following:

Testing parameters 1

 

Focal length

Distortion

Pixel Size

Image size

Base-height Ratio

Flight Height

GSD

Scale

IMU Sampling Frequency

GPS Sampling Frequency

50.2mm

<2μm

6.8μm

14.5K*10K/8K*11K

0.59

450m

7cm

1:9000

100HZ

10HZ

 

 

D. Final results:

The exterior elements from calibrated POS and aerial triangulation system are used directly for mapping by JX4GD Digital Photogrammetric Workstation. Then use checking points to do the contractive accuracy analysis. The result can be seen in Figure Two.

 

Figure 2   The contractive accuracy chart of direct domestic POS positioning and exterior elements obtaining by aerial triangulation (AT)

 

Testing Mode

Mode

Number of Checking Points

Root Mean Square Error of Plate(m)

Root Mean Square Error of Height (m)

Maximum difference on the plane (m)

Maximum difference ofelevation (m)

Same Flight

AT mode

17

0.05

0.13

0.1

0.2

POS positioning

17

0.08

0.1

0.17

0.2

Different Flight

AT mode for exterior elements

20

0.16

0.16

0.4

0.4

Calibrated POS

21

0.15

0.23

0.4

0.5

 

 

From above results, the accuracy of checking points obtained by calibrated POS is no different from that of AT.

          

The parameter analysis diagram after integrated calibration

 

 

 2. Vehicle-borne Lidar Flight Test

 

 

Name of the equipment: Light-small Vehicle-borne Lidar System

Flight Date: Aug. 13th 2011

Purpose of test: Obtain the laser point date

Configuration of the equipment:

 

Laser scanner

Transmitting frequency

100KHZ

Rotational Speed

1000r/min

FOV of the scanner

90°

Power

100%

IMU

Sampling frequency

100HZ

GPS

Sampling frequency

10HZ

Flight

Relative height

460m

Speed

80km/h

 

The results of point cloud:

City Point Cloud (1)

 

 City Point Cloud (2)

 

City Point Cloud (3)

 

 Vehicle-borne Lidar flight test in forest zone

Name of the equipment:

Name of the equipment: Light-small Vehicle-borne Lidar System

Flight Date: Oct. 10th 2011

Purpose of test: Obtain the forest laser point date

Configuration of the equipment:

 

Laser scanner

Transmitting frequency

100KHZ

Rotational Speed

1200r/min

FOV of the scanner

70°

Power

100%

IMU

Sampling frequency

200HZ

GPS

Sampling frequency

10HZ

Flight

Relative height

500m

Speed

80km/h

 

The results of point cloud:

 

Forest Point Cloud (1) 

Forest Point Cloud (2)

 

 

  3. Additional pictures:

 

Light-small Plane 

 

1:1000 Orthophotography

 

  1:1000 topographic mapping

 

 

   1:500 topographic mapping

 

 

  1:500 topographic mapping

 

 

 1:500 topographic mapping

 

 

 

Obtained by oblique cameras

 

 

 3D modeling and automatic matching

 

Point cloud and relevant images

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