Shoichiro Asano Professor, National Institute of Informatics, Tokyo Mallik Tatipamula
Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control...
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Transcript of Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control...
![Page 1: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/1.jpg)
Measurement of Landslide Movement with 3D Laser Scanner
ASANO, Hiroki
Erosion and Sediment Control Research Group
Public Works Research Institute
![Page 2: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/2.jpg)
Contents
•Most observation techniques and problem
•Outline of 3D Laser Mirror Scanner
•Attempt of landslide movement measurement
with 3D Laser Scanner
•Result of movement measurement
•Summary
![Page 3: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/3.jpg)
When landslide calamity occursBased on the site situation and the observation value
(ground expansion and contraction meter etc.).
・ The judgment is demanded promptly.
・ Appropriate measures is demanded.Hard measures : First aid restoration worker
Software measures : Precaution and shelter recommendation
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Observation technique at calamity suddenly
• Watch with CCD cameras
• Watch with ground expansion and contraction meter
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Concept chart of watch at calamity
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Ground expansion and contraction meter
crack
Storage box
Paling
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Principle of ground expansion and contraction meter
Movement of landslide
Inn bar line
Rotation of drum
Record pen
Recording paper
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Drum of ground expansion and contraction meter
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Example of setting up ground expansion and contraction meter
![Page 10: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/10.jpg)
Insufficient point of ground expansion and contraction meter
•The installation and the measurement are difficult in the place with danger.
•It takes time for the installation (The expansion and contraction meter is one/day).
•The installation and the observation at nighttime are difficult.
![Page 11: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/11.jpg)
laser scanner
landslide
Measurement image of 3D scanner
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3D Laser Scanner
![Page 13: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/13.jpg)
Composition of 3D laser scanner
① range finder electronics of the 3D scanner LMS-Z210 laser be②am rotating polygon slow scan ("frame scan") ECP compa③ ④ ⑤tible LPT printer port PC software ⑥ ⑦
![Page 14: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/14.jpg)
Outline of 3D laser scanner
Measurement range : 2 ~ 350, reflectivity >= 80 % Measurement accuracy : +/- 2.5 cm,
in the worst case +/- 10 cm
Range which can be measured : 80°×300° total
Beam divergence : approx. 3 mrad
Eye safety : Class 1 for the scanned beam
![Page 15: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/15.jpg)
Characteristic of 3D laser scanner• The pulse of the laser beam is launched repeatedly at very sho
rt intervals of time. • Each pulse reflects, the time to returning is measured, and the
distance is measured. • The direction of the laser beam is changed and three-dimensio
nal shape is scanned. = The measurement principle is the same as the machine and the total station etc. of a general light wave measurement.
• A new part is technically a method of scanning• It is possible to measure without setting up the reflection mirr
or .
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L
Δ t
L=c ・ Δ t (片道)
laser scanner
laser pulse t
t
t
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laser pulse
mirror
laser scanner
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laser scanner
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laser scanner
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laser scanner
Extension angle of 3mrad
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The measurement data displayedto personal-computer
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Computational graphic
![Page 23: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/23.jpg)
Computational graphic
![Page 24: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/24.jpg)
Landslide measurement which uses 3D laser scanner
• Geographical features measurement of landslide → Making of DEM( digital elevation model ) → Making of topographical map
• Measurement two or more times →Grasp of displacement situation Making of vector chart Grasp of range of landslide movement
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X Y
Zlaser scanner Overlapping the data is
difficult if there is no points in evaluation.
![Page 26: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/26.jpg)
point (X,Y,Z) point (X,Y,Z)
X Y
Zlaser scanner
![Page 27: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/27.jpg)
X YZ
laser scanner
point (X,Y,Z)
XY
Z
point (X,Y,Z)
laser scanner
![Page 28: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/28.jpg)
Reflection seal
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Situation of measurement
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laser scanner
Range of measurement
( top and bottom ) 40°
( right and left ) 85°
Landslide
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Procedure of the measurement data analysis
①The data measurement
②The point data making
④Making of TIN model
⑤Plan and section chart making
③Movement amount calculation
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Vector chart
![Page 33: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/33.jpg)
Frequency distribution of measurement error
0
2
4
60
1~ 1
2~ 2
3~ 3
4~ 4
5~ 5
6~ 6
7~ 7
8~ 8
9~
910
~
1011
~
1112
~
1213
~
1314
~
1415
~
(cm)移動量の差
個数
![Page 34: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/34.jpg)
11 月 16日
地すべり末端
11 月 24日
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Landslide movement range chartNNN
想定地すべり範囲
データ未取得範囲
11 16月 日
11 24月 日
![Page 36: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/36.jpg)
Summary
①7cm or less roughly against the amount of the movement of 15-20cm.
②The respect grasp of the range of the movement was possible because of overlapping the topographical map before and behind the movement amount.
③The examination is scheduled to be advanced for the improvement of the accuracy in the future.
![Page 37: Measurement of Landslide Movement with 3D Laser Scanner ASANO, Hiroki Erosion and Sediment Control Research Group Public Works Research Institute.](https://reader036.fdocuments.us/reader036/viewer/2022062515/56649d0c5503460f949e0c9c/html5/thumbnails/37.jpg)
Finished
Thank you for your attention.