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Open AccessArticle

RTK GNSS-Assisted Terrestrial SfM Photogrammetry without GCP: Application to Coastal Morphodynamics Monitoring

1
European Institute for Marine Studies (IUEM), Univ Brest, CNRS—UMS 3113, F-29280 Plouzané, France
2
Laboratoire Géosciences Océans, Univ Brest—UMR 6538, F-29280 Plouzané, France
3
LETG Caen, Univ Caen-Normandie—UMR 6554, F-14000 Caen, France
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(11), 1889; https://doi.org/10.3390/rs12111889
Received: 7 May 2020 / Revised: 5 June 2020 / Accepted: 9 June 2020 / Published: 11 June 2020
The present article describes a new and efficient method of Real Time Kinematic (RTK) Global Navigation Satellite System (GNSS) assisted terrestrial Structure-from-Motion (SfM) photogrammetry without the need for Ground Control Points (GCPs). The system only requires a simple frame that mechanically connects a RTK GNSS antenna to the camera. The system is low cost, easy to transport, and offers high autonomy. Furthermore, not requiring GCPs enables saving time during the in situ acquisition and during data processing. The method is tested for coastal cliff monitoring, using both a Reflex camera and a Smartphone camera. The quality of the reconstructions is assessed by comparison to a synchronous Terrestrial Laser Scanner (TLS) acquisition. The results are highly satisfying with a mean error of 0.3 cm and a standard deviation of 4.7 cm obtained with the Nikon D800 Reflex camera and, respectively, a mean error of 0.2 cm and a standard deviation of 3.8 cm obtained with the Huawei Y5 Smartphone camera. This method will be particularly interesting when simplicity, portability, and autonomy are desirable. In the future, it would be transposable to participatory science programs, while using an open RTK GNSS network. View Full-Text
Keywords: SfM photogrammetry; direct georeferencing; without GCP; coastal monitoring; cliff SfM photogrammetry; direct georeferencing; without GCP; coastal monitoring; cliff
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MDPI and ACS Style

Jaud, M.; Bertin, S.; Beauverger, M.; Augereau, E.; Delacourt, C. RTK GNSS-Assisted Terrestrial SfM Photogrammetry without GCP: Application to Coastal Morphodynamics Monitoring. Remote Sens. 2020, 12, 1889.

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