Teacher

prof. aggr. Alberto BEINAT

Credits

6 CFU

Objectives

The course aims to: - present the instruments and the techniques of the modern survey engineering for the geometric control of the territory, and for the monitoring and testing of civil works; - instruct the student to employ robotic total stations, digital levels, GNSS receivers and laser scanner, in all phases of operation: survey work design, field measurement, data processing, and results interpretation; - introduce other measurement technologies such as bathymetry, gravimetry, and mobile mapping systems.

Acquired skills

- Know the proper tools and techniques for the topographic land monitoring and the plano-altimetric control of structures;
- Plan, execute, and process geometric leveling lines;
- Design, measure, and adjust topographic networks with the use of electro-optical instrumentation;
- Plan, execute and process GNSS surveys in post-processing mode and in real-time mode;
- Know the employment of terrestrial and airborne laser scanning techniques;
- Carry out periodic verification of topographic instruments according to the ISO norms

Contents

Geometric control
Application fields and purpose. Displacements and deformations. Examples. 2h
Instrumental checks
ISO norms for the periodic verification of the topographic instruments. 2h
Classical techniques for altimetric control
Geometric levelling survey techniques. Analog and digital levels. Staffs, invar staffs. Field procedures. Staff readings, errors and adjustment. Tolerances and accuracies. Altimetric reference system. Altimetric networks. Benchmarks. 4h
Monitoring of structures
Monitoring of structures and buildings. Clinometers and zenith levels. Special techniques for altimetric control. Pendulums, plumbs, inclinometers, extensometers. 2h
Advanced terrestrial survey techniques
Motorized electronic total stations. Special features: autocollimation, automatic tracking, surface scanning, automatic repetition of the measures. Network adjustment. 6h
Advanced GNSS survey techniques
GNSS components: GPS, GLONASS, Galileo, Beidou. Post-processing relative positioning. Theoretical basis. Receiver settings. Field procedures. DOP, masking. Survey planning. Real-Time Differential positioning: DGPS and RTK. Theoretical basis. Technologies and services: Single base, NRT, VRS, FKP, MAC. Service architecture and interface. Rover receiver settings. Network issues (TTFF, latencies, reference systems). DGPS satellite services (EGNOS and WAAS). Tutorial on NRTK services employment. 8h
Terrestrial and airborne laserscanning
Terrestrial instruments and acquisition procedures. Scan alignment and geo-referencing. 3-D modeling. Mobile platforms. Point cloud processing, filtering and classification. Tutorial: relief of civil works by TLS and registration of point clouds 6h
Hydrography and bathymetry
Coast lines definitions: MSE, MWL, MHW, MSL, MLW etc. Tide gauges and height datum. Surveying techniques for the definition of MSL (Mean Sea Level). Bathymetry and seabed survey techniques. Bathymetric datum. 2 Topographic testing of civil works Purposes. Testing of bridges. Testing and monitoring of dams. 2h
Representation of displacements and deformations
Displacement field. Exact and approximate interpolation. Prediction methods. Deformation representation in a datum independent format. 2h

References

Technical documentation and manuals provided by the teachert.
Additional material or information available at http://https://materialedidattico.uniud.it/

Type of exam

Oral test, and presentation of a report on the laboratory activities carried out