期刊
GISCIENCE & REMOTE SENSING
卷 55, 期 4, 页码 457-476出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15481603.2017.1408931
关键词
Coastal cliff erosion; monitoring; terrestrial laser scanning; terrestrial photogrammetry; UAV photogrammetry; Normandy
资金
- French Agence Nationale de la Recherche through the Laboratoire d'Excellence LabexMER program [ANR-10-LABX-19-01]
- French government through the Investissements d'Avenir
- Brittany Region
- TOSCA project EROFALITT from the CNES (the French space agency)
- ANR project RICOCHET: multi-risk assessment on coastal territory in a global change context - French Research National Agency [ANR-16-CE03-0008]
- Agence Nationale de la Recherche (ANR) [ANR-16-CE03-0008] Funding Source: Agence Nationale de la Recherche (ANR)
This paper aims to compare models from terrestrial laser scanning (TLS), terrestrial photogrammetry (TP), and unmanned aerial vehicle photogrammetry (UAVP) surveys to evaluate their potential in cliff erosion monitoring. TLS has commonly been used to monitor cliff-face erosion (monitoring since 2010 in Normandy) because it guarantees results of high precision. Due to some uncertainties and limitations of TLS, TP and UAVP can be seen as alternative methods. First, the texture quality of the photogrammetry models is better than that of TLS which could be useful for analysis and interpretation. Second, a comparison between the TLS model and UAV or TP models shows that the mean error value is mainly from 0.013 to 0.03m, which meets the precision requirements for monitoring cliff erosion by rock falls and debris falls. However, TP is more sensitive to roughness than UAVP, which increases the data standard deviation. Thus, UAVP appears to be more reliable in our study and provides a larger spatial coverage, enabling a larger cliff-face section to be monitored with a regular resolution. Nevertheless, the method remains dependent on the weather conditions and the number of operators is not reduced. Third, even though UAVP has more advantages than TP, the methods could be interchangeable when no pilot is available, when weather conditions are bad or when high reactivity is needed.
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