scholarly journals EVALUATING MOBILE LASER SCANNING FOR LANDSLIDE MONITORING

2018 ◽  
Vol XLII-3/W4 ◽  
pp. 211-219
Author(s):  
N. A. Fuad ◽  
A. R. Yusoff ◽  
M. P. M. Zam ◽  
A. Aspuri ◽  
M. F. Salleh ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Human Life ◽  
Three Dimensional ◽  
Landslide Monitoring ◽  
Landslide Area ◽  
Project Area ◽  
Deviation Analysis ◽  
Gps Survey ◽  
Surface Deviation ◽  
Dimensional Surface

<p><strong>Abstract.</strong> Landslide is one of the natural disasters that give a huge impact to human life and social-economic development. Landslide needs to be monitored periodically in order to avoid loss of human life and damages of properties. Various methods have been used for monitoring landslide. This aim of the research is to evaluate the potential of mobile laser scanning technique for monitoring of landslide area. The objectives of the research are to acquire three-dimensional surface data of landslide area in different epochs and to analyze the movement of the landslide area using three-dimensional surface deviation and ground surveying techniques. The methodology begins with the GPS survey for the establishment of ground control points for the project area. The total station survey was then carried out to measure the three-dimensional coordinates of twenty well distributed targets located at the project area. The data collection phase was then continuing with the mobile laser scanning survey. The processing of the two epochs data acquired from both techniques was then carried out simultaneously and the methodology concluded with the output comparison analysis for the movement detection of the land slip. The finding shows that the mobile laser scanning provides fast and accurate data acquisition technique of the landslide surface. The surface deviation analysis of the two epochs laser scanning data was capable to detect the movement occurred in the project area. The results were successfully evaluated using the changes of the three-dimensional coordinates of the targets from the two epoch’s ground surveying data.</p>

Validation of phalanx bone three-dimensional surface segmentation from computed tomography images using laser scanning

2007 ◽  
Vol 37 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Nicole A. DeVries ◽  
Esther E. Gassman ◽  
Nicole A. Kallemeyn ◽  
Kiran H. Shivanna ◽  
Vincent A. Magnotta ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Computed Tomography Images ◽  
Surface Segmentation ◽  
Dimensional Surface

The Application of 3D Laser Scanning Technology in Ginkgo Landslide Monitoring

2014 ◽  
Vol 898 ◽  
pp. 759-762
Author(s):  
Yi Heng Pan ◽  
Zhi Gang Li ◽  
Zhan Shi Liu ◽  
Bo Li
Keyword(s):  
Data Analysis ◽  
Data Processing ◽  
Data Acquisition ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Landslide Monitoring ◽  
Deformation Characteristics ◽  
3D Laser Scanning ◽  
Design Data ◽  
Mapping Technology

Three-dimensional laser scanning technology, short for 3D laser scanning technology, is another innovation in surveying and mapping technology after GPS space positioning technology. This paper introduces the 3D laser scanning technology applied in the Ginkgo landslide monitoring. In this paper, the monitoring schematic design, data acquisition, data processing and data analysis are systematically introduced. It follows that Ginkgo landslide overall deformation characteristics, 3D laser scanning technologys strengths and weaknesses in the landslide monitoring. It is promising for the application of 3D laser scanning technology in landslide monitoring.

scholarly journals Kinematic landslide monitoring with Kalman filtering

2008 ◽  
Vol 8 (2) ◽  
pp. 213-221 ◽  
Author(s):  
M. Acar ◽  
M. T. Ozludemir ◽  
S. Erol ◽  
R. N. Celik ◽  
T. Ayan
Keyword(s):  
Kalman Filtering ◽  
Human Life ◽  
Natural Phenomenon ◽  
The Black Sea ◽  
Deformation Analysis ◽  
Landslide Monitoring ◽  
Landslide Area ◽  
Black Sea Region ◽  
The North ◽  
Mediterranean Regions

Abstract. Landslides are serious geologic disasters that threat human life and property in every country. In addition, landslides are one of the most important natural phenomena, which directly or indirectly affect countries' economy. Turkey is also the country that is under the threat of landslides. Landslides frequently occur in all of the Black Sea region as well as in many parts of Marmara, East Anatolia, and Mediterranean regions. Since these landslides resulted in destruction, they are ranked as the second important natural phenomenon that comes after earthquake in Turkey. In recent years several landslides happened after heavy rains and the resulting floods. This makes the landslide monitoring and mitigation techniques an important study subject for the related professional disciplines in Turkey. The investigations on surface deformations are conducted to define the boundaries of the landslide, size, level of activity and direction(s) of the movement, and to determine individual moving blocks of the main slide. This study focuses on the use of a kinematic deformation analysis based on Kalman Filtering at a landslide area near Istanbul. Kinematic deformation analysis has been applied in a landslide area, which is located to the north of Istanbul city. Positional data were collected using GPS technique. As part of the study, conventional static deformation analysis methodology has also been applied on the same data. The results and comparisons are discussed in this paper.

scholarly journals A comparison between stereophotogrammetry and smartphone structured light technology for three-dimensional face scanning

2022 ◽  
Author(s):  
Giorgio D‘Ettorre ◽  
Marco Farronato ◽  
Ettore Candida ◽  
Vincenzo Quinzi ◽  
Cristina Grippaudo
Keyword(s):  
San Francisco ◽  
Image Acquisition ◽  
Structured Light ◽  
Three Dimensional ◽  
Acquisition Time ◽  
Smartphone Applications ◽  
Processing Times ◽  
Deviation Analysis ◽  
Reference Images ◽  
Surface Deviation

ABSTRACT Objectives To compare three-dimensional facial scans obtained by stereophotogrammetry with two different applications for smartphone supporting the TrueDepth system, a structured light technology. Materials and Methods Facial scans of 40 different subjects were acquired with three different systems. The 3dMDtrio Stereophotogrammetry System (3dMD, Atlanta, Ga) was compared with a smartphone (iPhone Xs; Apple, Cupertino, Calif) equipped with the Bellus3D Face Application (version 1.6.11; Bellus3D Inc, Campbell, Calif) or Capture (version 1.2.5; Standard Cyborg Inc, San Francisco, Calif). Times of image acquisition and elaboration were recorded. The surface-to-surface deviation and the distance between 18 landmarks from 3dMD reference images to those acquired with Bellus3D or Capture were measured. Results Capturing and processing times with the smartphone applications were considerably longer than with the 3dMD system. The surface-to-surface deviation analysis between the Bellus3D and 3dMD showed an overlap percentage of 80.01% ± 5.92% and 56.62% ± 7.65% within the ranges of 1 mm and 0.5 mm discrepancy, respectively. Images from Capture showed an overlap percentage of 81.40% ± 9.59% and 56.45% ± 11.62% within the ranges of 1 mm and 0.5 mm, respectively. Conclusions The face image acquisition with the 3dMD device is fast and accurate, but bulky and expensive. The new smartphone applications combined with the TrueDepth sensors show promising results. They need more accuracy from the operator and more compliance from the patient because of the increased acquisition time. Their greatest advantages are related to cost and portability.

Surface Morphologies of Sealed Film on Anodized Al Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 2034-2037 ◽  
Author(s):  
Qi Zhou ◽  
Chun Lin He ◽  
Qing Kui Cai ◽  
Ping Zhao
Keyword(s):  
Laser Scanning ◽  
Three Dimensional ◽  
Boiling Water ◽  
Spherical Particles ◽  
Al Alloy ◽  
Two Dimensional ◽  
Anodized Aluminum ◽  
Sodium Dichromate ◽  
Surface Morphologies ◽  
Dimensional Surface

Surface morphologies of sealed films on anodized aluminum alloy extraordinarily affect on their corrosion resistance. Two-dimensional surface morphologies and three-dimensional surface morphologies of sol sealing, sodium dichromate sealing, boiling water sealing and unsealed films were obtained by OLS3100 laser scanning confocal microscope (LSCM). The three-dimensional surface morphologies show that the amounts of pores are greatly reduced when anodized aluminum 2024 are sealed by these methods. Surface roughness of sealed anodized aluminum 2024 films is increased comparing with the unsealed films, especially the boiling water sealing film. The results of two-dimensional surface morphologies show that unsealed films have plenty of spherical particles; there are raised blocks on sol film; there are much round or chrysalis cavities inside sodium dichromate sealing and boiling water sealing film. Especially there are the most and the deepest cavities with the largest diameter on the boiling water sealing film.

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