ACCURACY ASSESSMENT OF COASTAL TOPOGRAPHY DERIVED FROM UAV IMAGES
| Autor: | Nicolas Lachaussée, Frédéric Pouget, Nathalie Long, B. Millescamps, Xavier Bertin, A. Dumon |
|---|---|
| Přispěvatelé: | LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
lcsh:Applied optics. Photonics
business.product_category 010504 meteorology & atmospheric sciences Coastal monitoring 0211 other engineering and technologies 02 engineering and technology lcsh:Technology 01 natural sciences Data acquisition Digital Surface Model Structure from motion 14. Life underwater [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Image resolution Accuracy 021101 geological & geomatics engineering 0105 earth and related environmental sciences Digital camera Remote sensing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere lcsh:T lcsh:TA1501-1820 Ranging UAV photogrammetry Geography Photogrammetry Lidar lcsh:TA1-2040 GNSS applications lcsh:Engineering (General). Civil engineering (General) business |
| Zdroj: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLI-B1, Pp 1127-1134 (2016) International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Copernicus GmbH (Copernicus Publications), 2016, ⟨10.5194/isprsarchives-XLI-B1-1127-2016⟩ Xxiii Isprs Congress, Commission I (1682-1750) (Copernicus Gesellschaft Mbh), 2016, Vol. 41, N. B1, P. 1127-1134 |
| ISSN: | 2194-9034 1682-1750 |
| DOI: | 10.5194/isprs-archives-xli-b1-1127-2016 |
| Popis: | To monitor coastal environments, Unmanned Aerial Vehicle (UAV) is a low-cost and easy to use solution to enable data acquisition with high temporal frequency and spatial resolution. Compared to Light Detection And Ranging (LiDAR) or Terrestrial Laser Scanning (TLS), this solution produces Digital Surface Model (DSM) with a similar accuracy. To evaluate the DSM accuracy on a coastal environment, a campaign was carried out with a flying wing (eBee) combined with a digital camera. Using the Photoscan software and the photogrammetry process (Structure From Motion algorithm), a DSM and an orthomosaic were produced. Compared to GNSS surveys, the DSM accuracy is estimated. Two parameters are tested: the influence of the methodology (number and distribution of Ground Control Points, GCPs) and the influence of spatial image resolution (4.6 cm vs 2 cm). The results show that this solution is able to reproduce the topography of a coastal area with a high vertical accuracy (< 10 cm). The georeferencing of the DSM require a homogeneous distribution and a large number of GCPs. The accuracy is correlated with the number of GCPs (use 19 GCPs instead of 10 allows to reduce the difference of 4 cm); the required accuracy should be dependant of the research problematic. Last, in this particular environment, the presence of very small water surfaces on the sand bank does not allow to improve the accuracy when the spatial resolution of images is decreased. |
| Databáze: | OpenAIRE |
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