73959 - Metric Survey of Built Environment M

Learning outcomes

The course provides the skills needed to design and execute metric surveys of buildings and infrastructures at large and very large scale, carried out using the most modern techniques of surveying and in particular aimed at supporting documentation and conservation of Cultural Heritage.

Course contents

Introduction: the main problems related to metrical surveying, a general framework for the techniques of Geomatics Engineering. Surveying for documenation and conservation of Cultural Heritage

Short review of the problems of the reference systems and large-scale numerical cartography, focused on the management of Geographic Information Systems with GIS software. Appropriate use of satellite imagery in urban contexts.

Modern techniques of Geomatics, general description of acquisition and data processing issues. Techniques and applications. Integration and integrability of digital data in a BIM perspective.

The techniques of Digital Photogrammetry and Scanning will be in particular addressed, especially for close-range 3D applications (Architecture, Civil Engineering, Cultural Heritage, infrastructure and industry, applications in forensics, etc..). Finally, some questions related to surveying for cadastral applications.

DIGITAL PHOTOGRAMMETRY:

- Digital cameras, acquisition and characteristics of digital images, introduction to UAVs (drones);

- Design and implementation of a terrestrial photogrammetric survey;

- Internal and external orientation in modern photogrammetry;

- From images to three-dimensional model of objects at different scales and with different geometrical characteristics: from the conventional approaches to automatic matching for a sterocouple or a block of images, strategies for automated multi-orientation with approaches derived from Computer Vision (es. Structure from Motion);

- Products of the modern digital photogrammetry: photoplans, dense clouds, photorealistic models, orthophotos, etc..

3D SCANNING TECHNIQUES

- Types of laser scanning systems (time of flight or phase based), triangulation scanners, structured light technology.

- How to design and implement a 3D scanning survey: from the acquisition phase to data processing in the laboratory, technical and operational issues.

- The phases of the processing of the point cloud, the generation of the surfaces, texturing of the 3D model, etc.;

- Products of laser scanning and their usage.

Review and discussion of appropriate solutions to real case studies.

CADASTRAL SURVEYING

A part of the course will be devoted to methods for inserting surveys of the built environemnt into the cartographic data base of the national Cadastre (fitting the survey to the deformations of the map with PREGEO and surveying of the individual units with the program DOCFA), with use of EDM instrumentation, GPS, and with the possibility of using UAVs (drones) for the works mainly developed along roads.

Readings/Bibliography

Scientific publications and documents provided during the lectures

KRAUS Karl: "Photogrammetry from Images and Laser Scans", de Gruyter, 2007

ATKINSON K.B.: "Close Range Photogrammetry and Machine Vision". Wittles Publishing, 2001

GUIDI G., BERALDIN J.A., RUSSO M.: "Acquisizione 3D e modellazione poligonale", McGraw-Hill, 2010

Teaching methods

Together with the lectures related to the theoretical aspects, the course contemplates exercises in laboratory and on the field: photogrammetric and laserscanning survey of objects of architectural interest, orientation and restitution by digital instrumentation, digital image processing, calibration of non-metric cameras.

Assessment methods

Written/oral examination

Teaching tools

Lectures with multimedia presentation, exercises in Laboratory and on the field.

Analysis and discussion by examples of real cases.

Office hours

See the website of Gabriele Bitelli

See the website of Roberto Maria Brioli