The Use of Nadir and Oblique UAV Images for Building Knowledge
Open Access
- 1 December 2017
- journal article
- research article
- Published by MDPI AG in ISPRS International Journal of Geo-Information
- Vol. 6 (12), 393
- https://doi.org/10.3390/ijgi6120393
Abstract
This paper focuses on the processing and study of 3D models obtained from images captured by an unmanned aerial vehicle (UAV). In particular, we wanted to study the accuracy gains achieved in the surveying and the measurement, such as height, area, and volume, of the dimensions of the buildings in the 3D models obtained with both nadir and oblique UAV flights. These latter types of flights are particularly suitable for the 3D modeling of cities or urban agglomerations, where it is important to achieve a complete building reconstruction, including façades and footprints of buildings. For this purpose, several UAV surveys with both nadir and oblique axes were performed. The nadir flight acquired images over an area of about 3.5 hectares containing 30 buildings, while the second flight, performed with both a nadir camera and an oblique camera, was conducted on a single building. The images from the flights were processed with Photoscan software by Agisoft and with Pix4D, studying their different potentialities and functionality. The results were compared with the data from the 1:2000 scale Geotopographic Database (DBGT), with the results of a Global Navigation Satellite System (GNSS) survey and with 3D model from the Terrestrial Laser Scanner (TLS) survey. The obtained results have shown that oblique UAV flights increase the achievable accuracy both in terms of the number of points in a point cloud, and in the in measurements taken on the 3D models, with respect to the limited cost, and at the increase in time for surveying and image processing.Keywords
This publication has 11 references indexed in Scilit:
- Integration between TLS and UAV photogrammetry techniques for forestry applicationsiForest - Biogeosciences and Forestry, 2017
- Combining nadir and oblique UAV imagery to reconstruct quarry topography: methodology and feasibility analysisEuropean Journal of Remote Sensing, 2017
- Using UAVs for map creation and updating. A case study in RwandaSurvey Review, 2016
- Detailed geological mapping in mountain areas using an unmanned aerial vehicle: application to the Rodoretto Valley, NW Italian AlpsGeomatics, Natural Hazards and Risk, 2016
- Quality Assessment of Unmanned Aerial Vehicle (UAV) Based Visual Inspection of StructuresAdvances in Structural Engineering, 2014
- Semi-Automatic Registration of Airborne and Terrestrial Laser Scanning Data Using Building Corner Matching with Boundaries as Reliability CheckRemote Sensing, 2013
- UAV for 3D mapping applications: a reviewApplied Geomatics, 2013
- ‘Structure-from-Motion’ photogrammetry: A low-cost, effective tool for geoscience applicationsGeomorphology, 2012
- UAV and RPV systems for photogrammetric surveys in archaelogical areas: two tests in the Piedmont region (Italy)Journal of Archaeological Science, 2011
- Roadway traffic monitoring from an unmanned aerial vehicleIEE Proceedings - Intelligent Transport Systems, 2006