Resolution and Accuracy of an Airborne Scanning Laser System for Beach Surveys

Middleton, Jason H.; Cooke, C.; Kearney, Edward T.; Mumford, Peter; Mole, Melissa A.; Nippard, Greg J.; Rizos, Chris; Splinter, Kristen D.; Turner, Ian L.

doi:10.1175/jtech-d-12-00174.1

Cited by 26 publications

(17 citation statements)

References 6 publications

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“…Aerial methods are a popular alternative to on-ground methods as they can rapidly cover large areas at adequate resolution (e.g., Stockdon et al, 2002). In a limited number of studies, airborne laser scanning has been carried out before and after a storm event to measure beach change (Middleton et al, 2013;Sallenger et al, 2003), although the frequency of repeat deployments is limited by high costs. Annual surveys have been adopted in broad scale multidecadal programs, where measurement frequency is reduced to achieve broader spatial extent (e.g., Mason et al, 2000;Wijnberg and Terwindt, 1995).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Opportunistic Shoreline Monitoring Capability Utilizing Existing “Surfcam” Infrastructure

Bracs¹,

Turner²,

Splinter³

et al. 2016

Journal of Coastal Research

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Bracs, M.A.; Turner, I.L.; Splinter, K.D.; Short, A.D.; Lane, C.; Davidson, M.A.; Goodwin, I.D.; Pritchard, T., and Cameron, D., 0000. Evaluation of opportunistic shoreline monitoring capability utilizing existing ''surfcam'' infrastructure. Journal of Coastal Research, 00(0), 000-000. Coconut Creek (Florida), ISSN 0749-0208.This paper investigates the opportunistic repurposing of existing low-elevation recreational surf cameras (''surfcams'') to provide quantitative shoreline position data. Shoreline data are of fundamental importance in coastal management; however, intensive effort is required to routinely sample this dynamic environmental parameter. Established (and generally research-oriented) coastal imaging systems provide shoreline data in higher temporal resolution across broader spatial scales than is achievable by traditional survey techniques. The key benefits of adopting surfcams for shoreline monitoring are the wide availability of existing stations and their relatively low cost. In addition to the known challenges of optical remote sensing, there are further constraints associated with the typically low elevations of surfcams (9 to 22 m in this study) and the common use of dynamic pan-tilt-zoom positioning. This study used surfcams at nine diverse sites along the SE Australian coastline. Surfcam-derived shorelines were evaluated against monthly real time kinematic global navigation satellite system (RTK-GNSS) surveys. Standard deviations (SDs) of error of 4 to 14 m (horizontal) were observed in data provided by the commercial surfcam operator. After consideration of image geometry, camera stability, shoreline visibility, and shoreline elevation, SDs of error within 1 to 4 m were achieved. At one site, daily surfcam-derived shorelines were evaluated against video-derived shorelines obtained by a state-of-the-art Argus coastal imaging system. Data provided by the surfcam operator had a SD of error of 6 m (horizontal) when compared to the Argus-derived shoreline dataset, and improved methodology reduced this to below 2 m. Generic methods for identifying and addressing issues resulting from surfcam movement and low viewing angle of the beach are presented, as well as data processing options and recommendations for the potential wider adoption of this largely untapped coastal monitoring resource.ADDITIONAL INDEX WORDS: Coastal imaging, beach monitoring, coastal management.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Opportunistic Shoreline Monitoring Capability Utilizing Existing “Surfcam” Infrastructure

Bracs¹,

Turner²,

Splinter³

et al. 2016

Journal of Coastal Research

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“…Conveniently, the aircraft is permanently based at an airfield located 10 min flight time from Narrabeen, further facilitating very rapid deployment. Comparisons detailed in Middleton et al [101] of in-situ ATV RTK-GPS surveys from Narrabeen showed the airborne lidar data had a mean vertical error of 0.02 m when outliers were removed. Using this new technology, the lidar system has repeatedly flown significant storm events between 2011 and present ( Figure 2B); two of these events that illustrate the different capabilities of the system are described below.…”

Section: Airborne Lidarmentioning

confidence: 96%

“…Aircraft-mounted airborne lidar is a well establish remote sensing tool that is now widely used to obtain high quality topographic data spanning large extents (100 s of kilometers) of coastline [100]. A rapid-response system to fly lidar for storm erosion monitoring was developed jointly by the University of New South Wales' School of Aviation and Water Research Laboratory [101],. The airborne lidar system in use at Narrabeen incorporates a Piper Pa44 Seminole plane equipped with a Riegl Q240i lidar coupled with a NovAtel SPAN-CPT integrated GNSS and IMU.…”

Section: Airborne Lidarmentioning

confidence: 99%

Remote Sensing Is Changing Our View of the Coast: Insights from 40 Years of Monitoring at Narrabeen-Collaroy, Australia

2018

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Narrabeen-Collaroy Beach, located on the Northern Beaches of Sydney along the Pacific coast of southeast Australia, is one of the longest continuously monitored beaches in the world. This paper provides an overview of the evolution and international scientific impact of this long-term beach monitoring program, from its humble beginnings over 40 years ago using the rod and tape measure Emery field survey method; to today, where the application of remote sensing data collection including drones, satellites and crowd-sourced smartphone images, are now core aspects of this continuing and much expanded monitoring effort. Commenced in 1976, surveying at this beach for the first 30 years focused on in-situ methods, whereby the growing database of monthly beach profile surveys informed the coastal science community about fundamental processes such as beach state evolution and the role of cross-shore and alongshore sediment transport in embayment morphodynamics. In the mid-2000s, continuous (hourly) video-based monitoring was the first application of routine remote sensing at the site, providing much greater spatial and temporal resolution over the traditional monthly surveys. This implementation of video as the first of a now rapidly expanding range of remote sensing tools and techniques also facilitated much wider access by the international research community to the continuing data collection program at Narrabeen-Collaroy. In the past decade the video-based data streams have formed the basis of deeper understanding into storm to multi-year response of the shoreline to changing wave conditions and also contributed to progress in the understanding of estuary entrance dynamics. More recently, 'opportunistic' remote sensing platforms such as surf cameras and smartphones have also been used for image-based shoreline data collection. Commencing in 2011, a significant new focus for the Narrabeen-Collaroy monitoring program shifted to include airborne lidar (and later Unmanned Aerial Vehicles (UAVs)), in an enhanced effort to quantify the morphological impacts of individual storm events, understand key drivers of erosion, and the placing of these observations within their broader regional context. A fixed continuous scanning lidar installed in 2014 again improved the spatial and temporal resolution of the remote-sensed data collection, providing new insight into swash dynamics and the often-overlooked processes of post-storm beach recovery. The use of satellite data that is now readily available to all coastal researchers via Google Earth Engine continues to expand the routine data collection program and provide key insight into multi-decadal shoreline variability. As new and expanding remote sensing technologies continue to emerge, a key lesson from the long-term monitoring at Narrabeen-Collaroy is the importance of a regular re-evaluation of what data is most needed to progress the science.

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“…As the local stockpiling of sand grains is of the order of a few millimetres, there is a need to distinguish sub-centimetre height variations. Airborne methods only have an accuracy of about one decimetre (Middleton et al 2013). …”

Section: Data Acquisitionmentioning

confidence: 99%

Development of an Efficient Approach of Archaeological Heritage in the Intertidal Zone of the Belgian North Sea

Decock

Stal

Ackere

et al. 2016

Proceedings of the ARQUEOLÓGICA 2.0 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovat

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The knowledge of the submerged cultural heritage in the North Sea is rather limited. The Belgian North Sea is being used for a lot of different purposes, such as fishing, aggregate extraction, wind farms, dredging, etc. Due to these increasing economic activities, the underwater archive is in danger. In the context of the UNESCO Convention on the Protection of the Underwater Cultural Heritage of 2001, gathering more information about the submerged cultural heritage in the intertidal zones of the North Sea is one of the main objectives of the Belgian scientific project 'SeArch'. It will give a clearer picture of the broader cultural and archaeological heritage in the region and it can be used as a basis for a sustainable management by government agencies. The Department of Geography (Ghent University, Belgium) contributes to the SeArch project in two ways. First, an innovative survey methodology has been developed which allows an accurate and cost-efficient evaluation of the archaeological potential in the intertidal zones of the Belgian beaches. Secondly, the Department of Geography is developing an interactive webGIS platform, which makes it possible to share, integrate and visualize the gathered archaeological and environmental data and information in a user-friendly way. Hereby, the total potential of this project is fully exploited in a time-efficient manner. To create an interactive webGIS platform, a good structured spatial database is needed. It enables manipulation of a wide variety of georeferenced information in both raster and vector formats. This paper provides more information about the configuration and application of the spatial database. Moreover, it focusses on the development of a fully functional Spatial Data Infrastructure (SDI) using the most reliable, powerful and state-of-the-art technological components. Besides, a new way of collecting geomatic data in a fast and accurate manner will be discussed. Some processing results will show the possibilities for detecting and visualizing underground structures and archaeological objects.

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Resolution and Accuracy of an Airborne Scanning Laser System for Beach Surveys

Cited by 26 publications

References 6 publications

Evaluation of Opportunistic Shoreline Monitoring Capability Utilizing Existing “Surfcam” Infrastructure

Evaluation of Opportunistic Shoreline Monitoring Capability Utilizing Existing “Surfcam” Infrastructure

Remote Sensing Is Changing Our View of the Coast: Insights from 40 Years of Monitoring at Narrabeen-Collaroy, Australia

Development of an Efficient Approach of Archaeological Heritage in the Intertidal Zone of the Belgian North Sea

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