Ground topography validation of a high-resolution DEM and orthophotos obtained with a commercial UAS
| Autor: | Gino Casassa, Cristian Peralta, Eneko Beriain, Andres Marangunic, Claudio Iglesias, Cedomir Marangunic |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
0208 environmental biotechnology Resolution (electron density) Orthophoto 02 engineering and technology Kinematics Geodesy 01 natural sciences Electronic mail Standard deviation 020801 environmental engineering GNSS applications Structure from motion Digital elevation model Geology 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | 2017 First IEEE International Symposium of Geoscience and Remote Sensing (GRSS-CHILE). |
| DOI: | 10.1109/grss-chile.2017.7996017 |
| Popis: | A commercial Unmanned Aircraft System (UAS) flying at a height above ground of 135 m has been deployed over a 0.5 × 1 km village area at the foothills of the central Andes of Chile in order to obtain a 3D survey map of the area. A high resolution Digital Elevation Model (DEM) was derived from a total of 273 aerial photos by means of the structure from motion software Pix4D. The DEM was georeferenced based on the absolute coordinates of 6 Ground Reference Points (GRPs). Comparison of the DEM elevations with a precise kinematic dual-frequency GNSS ground survey yields a mean height difference of 12 cm and a standard deviation of 5 cm. Planimetric precision of the orthophoto mosaic is in average 1 cm when compared to ground measurements obtained with a tape measure on small-scale landmarks. Comparison of the 3D coordinates of the orthophotos and the DEM with 4 Ground Control Points shows that the horizontal accuracy is better than 5 cm and the vertical accuracy is better than 12 cm. The results confirm that accurate topographic information can be derived from aerial photographs obtained with a drone equipped with a GNSS receiver. |
| Databáze: | OpenAIRE |
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