Ing - Civ (Mag.)(ord. 270) - LC (437) CIVIL ENGINEERING FOR RISK MITIGATION
054141 - GEO-ENGINEERING TECHNIQUES FOR UNSTABLE SLOPES
094814 - GEOLOGICAL AND PHOTOGRAPHICAL ASSESSMENT AND MONITORING
The course of "Photogrammetric assessment and monitoring" aims to teach how to reconstruction 3D models of terrain topography and rock face surface using Geomatics techniques. In particular, the design, operation and processing of surveying based on Structure-from-Motion Photogrammetry and Terrestrial Laser Scanning are discussed. The course will also train on techniques for point cloud processing, in order to extract those information necessary to cope with problems of geological risk assessment and site monitoring with advanced Engineering Geology solutions. This course is integrated with the course "Geological assessment and monitoring." It may be chosen together with the course “Geophysical assessment and monitoring” as they are part of the module named “Geo-Engineering Techniques for Unstable Slopes (GETUS)”.
Risultati di apprendimento attesi
Knowledge and understanding: basic theoretical knowledge of Structure-from-Motion Photogrammetry and Terrestrial Laser Scanning for point cloud acquisition.
Applying knowledge and understanding: to learn how to plan, operate and process both photogrammetric and Terrestrial Laser Scanning surveying; to process geo-referenced point clouds in order to derive digital surface models; to extact geomorphological features from point clouds; and to compare point clouds within time to determine deformations and changes over wide regions.
Making judgments: ability to assess the quality of a point cloud obtained from photogrammetry or Terrestrial Laser Scanning techniques.
Communication skills: ability to write a clear technical report the describe the surveying and data processing methodology applied to a real case study.
Learning skills: ability to export the acquired technical knowledge to other surveying techniques and point cloud processing methods.
Introduction to geodetic reference ystems, 2D and 3D geometric transformations, concepts of accuracy and precision, validation of results.
Photogrammetric (image-based) point cloud acquisition
Camera technology, camera calibration, collinearity equations, automatic orientation of terrestrial image blocks and sequences and subsequent dense matching (Structure-from-Motion Photogrammetry- SfM), bundle adjustment, ground control points, orthophoto production, UAV (Unamnned Aerial Vehicles) Photogrammetry.
Terrestrial Laser Scanning (range-based) point cloud acquisition
Terrestrial Laser Scanner (TLS) technology, data acquisition and registration, georeferencing.
Surveying/GNSS techniques for precise point positioning
Total Stations and GNSS application for precise point measurement and geo-referencing of photogrammetric/TLS projects.
Point cloud processing techniques
Preprocessing techniques for point clouds: segmentation, cleaning, subsampling, filtering; point cloud registration: manual point-based registation, ICP; extraction of geomorphological features: plane extraction, dip-dip measurement, stereoplot generation; deformation/change detection-based techniques.
The course has a flipped structure: some problems related to specific case studie in the lab and in the field will be posed. With the help of teachers and assistants, students will learn how to design the applications of surveying and monitoring technique, to be integrated with Engineering Geology and Geophysical methods. In addition, the students are not supposed to work in order to provide results to external experts, but they will analyse and interpret the results by themselves thanks to the geological background supported with the integrated course "Geological assessment and monitoring.
In addition, some preliminary lab activity focused at learning specific surveying techniques will be organized.
Mathematical Analysis, basic principles of Surveying.
Modalità di valutazione
The final evaluation will consist of an oral presentation to be given in front of an interdisciplinary commission made up of the teachers of different modules involved in GETUS. The subject of this speach will be related to the real case studies afforded during the course. Students will be clustered in groups of maximum 5/6 people: each group will deal with different case studies, to be described in a detailed report. Students should demonstrate the knowledge of the adopted technique, as well as the ability to discuss the solutions implemented and the results obtained, according to the expertise acquired in the different courses of the modulus.
Slideshttps://beep.metid.polimi.it/Luhmann T, Robson S, Kyle S, Boehm J, Close Range Photogrammetry: 3D Imaging Techniques - 2nd Edition, Editore: Walter De Gruyter Inc., Germany, Anno edizione: 2016
Heritage, G.L. and A.R.G. Large, Laser Scanning for the Environmental Sciences, Editore: John Wiley & Sons, Chichester, U.K., Anno edizione: 2009, ISBN: 978-1-4051-5717-9
Vosselman, G. and Maas, H.G., Airborne and Terrestrial Laser Scanning, Editore: Whittles Publishing
Kraus, K., Photogrammetry: Geometry from Images and Laser Scans, Editore: Walter de Gruyter
Schofield, W., Engineering Surveying, Editore: Butterworth-Heinemann
Mikhail, E.M., Bethel, J. and McGlone, J.C., Introduction to Modern Photogrammetry, Editore: John Wiley & Sons
M. Scaioni, Modern Technologies for Landslide Monitoring and Prediction, Editore: Springer, Anno edizione: 2015, ISBN: 978-3-662-45930-0
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