ULISES: An Open Source Code for Extrinsic Calibrations and Planview Generations in Coastal Video Monitoring Systems

Simarro, Gonzalo; Ribas, Francesca; Alvarez, Amaya; Guillén, Jorge; Chic, Óscar; Orfila, Alejandro

doi:10.2112/jcoastres-d-16-00022.1

Cited by 42 publications

(34 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, both results from Procedure 1 and Procedure 2a were in line with other works that used a standard georectification technique for coastal imagery analysis (e.g., [5][6][7][8]), and proved the suitability of the methodological steps presented in this work.…”

Section: Discussionsupporting

confidence: 88%

“…Timestacks were originally produced with the main purpose of studying wave runup process on the foreshore [39][40][41], as the camera acquisitions allowed the monitoring of the high-frequency waterline oscillation on the beach slope. Over the last few decades, Timestack images have been extensively applied to advance in foreshore runup knowledge [42][43][44][45][46][47][48][49][50][51], to improve runup measurements [8,52,53] and to propose new wave runup parameterization [37,[54][55][56]. Besides the possibility of measuring wave runup, Lippmann and Holman [57] related Timestack pixel intensity to temporal series of water surface elevation.…”

Section: Coastal Video Monitoring Applicationsmentioning

confidence: 99%

“…In the 2000s, the expansion of commercial video systems (e.g., CoastalComs, Erdman) and the development of dedicated image-processing tools (e.g., SIRENA [5], COSMOS [6], Beachkeeper plus [7], ULISES [8]) promoted the installation of video monitoring stations for scientific purpose with the use of relatively cheap internet protocol (IP) video cameras to overcome the expensive installation and purchase of Argus system (e.g., [9]). Although the lower spatial coverage in comparison with other remote-sensing technologies (e.g., satellite imagery, wave radar, LiDAR), shore-based video monitoring technique gives an excellent compromise between spatial and temporal resolutions, beneficial to support both short-and long-term synoptic analysis of the hydro-and morphodynamic processes occurring in the nearshore.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Operational Use of Surfcam Online Streaming Images for Coastal Morphodynamic Studies

2019

View full text Add to dashboard Cite

Coastal video monitoring has been proven to be a valuable shore-based remote-sensing technique to study coastal processes, as it offers the possibility of high-frequency, continuous and autonomous observations of the coastal area. However, the installation of a video systems infrastructure requires economical and technical efforts, along with being often limited by logistical constraints. This study presents methodological approaches to exploit “surfcam” internet streamed images for quantitative scientific studies. Two different methodologies to collect the required ground control points (GCPs), both during fieldwork and using web tools freely available are presented, in order to establish a rigorous geometric connection between terrestrial and image spaces. The application of an image projector tool allowed the estimation of the unknown camera parameters necessary to georectify the online streamed images. Three photogrammetric procedures are shown, distinct both in the design of the computational steps and in number of GCPs available to solve the spatial resection system. Results showed the feasibility of the methodologies to generate accurate rectified planar images, with the best horizontal projection accuracy of 1.3 m compatible with that required for a quantitative analysis of coastal processes. The presented methodologies can turn “surfcam” infrastructures and any online streaming beach cam, into fully remote shore-based observational systems, fostering the use of these freely available images for the study of nearshore morphodynamics.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Coastal Video Monitoring Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Operational Use of Surfcam Online Streaming Images for Coastal Morphodynamic Studies

2019

View full text Add to dashboard Cite

show abstract

“…mimic the Argus philosophy with the objective of providing continuous measurements of coastal processes in a non-supervised and autonomous procedure. Here, we use one of such approaches, SIRENA/Ulises (Nieto et al, 2010;Simarro et al, 2017), which has been operating since 5 2009 in Cala Millor. The system is composed of five CCD cameras connected to a server acquiring daily images (Gómez-Pujol et al, 2013).…”

Section: Video Monitoringmentioning

confidence: 99%

Numerical and remote techniques for operational beach management under storm group forcing

Morales-Márquez¹,

Orfila²,

Simarro³

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. The morphodynamic response of a microtidal beach under a storm group is analyzed, and the effects of each individual event inferred from a numerical model, in situ measurements and video imaging. The first storm, with moderate conditions (H s ∼ 1 m during 6 hours), eroded the aerial beach and generated a submerged sandbar in the breaking zone. The bar is further directed offshore during the more energetic second event (H s = 3.5 m and 53 hours). The third storm, similar to the first one, hardly affected the beach morphology, which stresses the importance of the beach configuration previous to a storm. The 5 volume of sand mobilized during the storm group was around 17.65 m 3 /m. During the following months, which were characterized by mild wave conditions, the dry beach recovered half of the volume of sand that was transported offshore during the storm group (∼ 9.27 m 3 /m). The analysis of beach evolution shows two different characteristic time scales for the erosion and the recovery processes associated with storm and mild conditions respectively. Besides, the response depends largely on the previous beach morphological state. The work also stresses the importance of using different tools (video-monitoring, 10 modeling and field campaign) to analyze beach morphodynamics.Copyright statement.

show abstract

“…This is actually not expected to be a problem for video images detecting wind waves, for the pixel size projected in the space is much smaller than the wavelength in the area of interest. The presented algorithm, uBathy, takes its name from cBathy but with "u" referring to ULISES [34], the software it has been developed in.…”

Section: Introductionmentioning

confidence: 99%

UBathy: A New Approach for Bathymetric Inversion from Video Imagery

Simarro¹,

Calvete

Luque

et al. 2019

Remote Sensing

Self Cite

View full text Add to dashboard Cite

A new approach to infer the bathymetry from coastal video monitoring systems is presented. The methodology uses principal component analysis of the Hilbert transform of video images to obtain the components of the wave propagation field and their corresponding frequency and wavenumber. Incident and reflected constituents and subharmonics components are also found. Local water depth is then successfully estimated through wave dispersion relationship. The method is first applied to monochromatic and polychromatic synthetic wave trains propagated using linear wave theory over an alongshore uniform bathymetry in order to analyze the influence of different parameters on the results. To assess the ability of the approach to infer the bathymetry under more realistic conditions and to explore the influence of other parameters, nonlinear wave propagation is also performed using a fully nonlinear Boussinesq-type model over a complex bathymetry. In the synthetic cases, the relative root mean square error obtained in bathymetry recovery (for water depths 0.75 m ⩽ h ⩽ 8.0 m ) ranges from ∼1% to ∼3% for infinitesimal-amplitude wave cases (monochromatic or polychromatic) to ∼15% in the most complex case (nonlinear polychromatic waves). Finally, the new methodology is satisfactorily validated through a real field site video.

show abstract

ULISES: An Open Source Code for Extrinsic Calibrations and Planview Generations in Coastal Video Monitoring Systems

Cited by 42 publications

References 39 publications

Operational Use of Surfcam Online Streaming Images for Coastal Morphodynamic Studies

Operational Use of Surfcam Online Streaming Images for Coastal Morphodynamic Studies

Numerical and remote techniques for operational beach management under storm group forcing

UBathy: A New Approach for Bathymetric Inversion from Video Imagery

Contact Info

Product

Resources

About