The main objective of the drone-based laser scanner survey was to identify any morphological changes in the site compared with previous surveys and provide high-quality data representing its current condition.<\/p>\n\n\n\n
In particular, the survey produced:<\/p>\n\n\n\n
- \n
- a georeferenced three-dimensional point cloud;<\/li>\n\n\n\n
- a detailed site plan including three-dimensional contour lines and cross-sections.<\/li>\n<\/ul>\n\n\n\n
Equipment Used: Drone and LiDAR Technology<\/strong><\/h2>\n\n\n\n
For the drone-based laser scanner survey, EPC selected the DJI Zenmuse L1, DJI\u2019s first LiDAR sensor integrated with the Matrice 300 RTK platform.<\/p>\n\n\n\n
The Matrice 300 RTK is a powerful industrial drone equipped with an advanced flight-control system, six-directional sensing and positioning, and an FPV camera. Accurate georeferencing of the collected data is ensured by the integrated RTK module, which provides centimetre-level positioning information.<\/p>\n\n\n\n
The Zenmuse L1 payload combines a LiDAR module, a high-precision IMU and a camera equipped with a 20 MP CMOS sensor. When used with DJI Terra software, it provides a complete solution for generating three-dimensional data in real time, allowing critical decisions to be made rapidly in the field.<\/p>\n\n\n\n
\n\n![\"Laser](\"https:\/\/www.epcsrl.eu\/wp-content\/uploads\/2025\/02\/vallesella_EPC_NuvoladiPunticompletavisualizzataaColori-1-1024x675.png\")
<\/a><\/figure>\n<\/div>\n\n\n\n\n![\"Laser](\"https:\/\/www.epcsrl.eu\/wp-content\/uploads\/2025\/02\/vallesella_EPC_VisualizzazioneMeshdellaNDPGround_DTM-1024x663.png\")
<\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\nSurvey Methodology and Data Processing<\/strong><\/h2>\n\n\n\n
The drone-based laser scanner survey was carried out according to a detailed preliminary plan developed on the basis of the site\u2019s terrain morphology.<\/p>\n\n\n\n
Flight operations followed a pattern of straight flight lines. The Matrice 300 RTK performed automatic periodic calibrations to ensure optimal accuracy between overlapping survey strips.<\/p>\n\n\n\n
Data georeferencing was further refined through the use of a ground-based GPS antenna. The post-processing activities included:<\/p>\n\n\n\n
- \n
- preliminary data processing and point-cloud generation;<\/li>\n\n\n\n
- transformation of the coordinates into the official reference system, EPSG:7791, followed by rotation and translation into the client\u2019s local coordinate system;<\/li>\n\n\n\n
- processing of the LiDAR point clouds, including noise reduction and classification of ground points separately from vegetation and structures;<\/li>\n\n\n\n
- verification of horizontal and vertical accuracy.<\/li>\n<\/ul>\n\n\n\n
Final Deliverables<\/strong><\/h2>\n\n\n\n
The final products delivered to the Municipality included:<\/p>\n\n\n\n
- \n
- point clouds;<\/li>\n\n\n\n
- Digital Elevation Models;<\/li>\n\n\n\n
- detailed orthophotos;<\/li>\n\n\n\n
- CAD drawings, including a terrain surface generated from a Digital Terrain Model with 10 cm cells, represented through one-metre contour lines, together with historical monitoring cross-sections.<\/li>\n<\/ul>\n\n\n\n\n\n
![\"Laser](\"https:\/\/www.epcsrl.eu\/wp-content\/uploads\/2025\/02\/vallesella_EPC_RESTITUZIONE_PLANIMETRICA_modellodigitale-min.jpg\")
<\/a><\/figure>\n<\/div>\n\n\n\n
![\"Laser](\"https:\/\/www.epcsrl.eu\/wp-content\/uploads\/2025\/02\/vallesella_EPC_NuvoladiPunticompletavisualizzataaColori-1.png\")
<\/a><\/figure>\n<\/div>\n\n\n\n