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Pushing the Boundaries: Integration of Multi-Source Digital Elevation

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Pushing the Boundaries: Integration of Multi-Source Digital Elevation Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 105, 263–271, 2015 (for 2014) Pushing the boundaries: Integration of multi-source digital elevation model data for seamless geological mapping of the UK’s coastal zone Keith Westhead1*, Kay Smith1, Evelyn Campbell1, Andrew Colenutt2 and Stuart McVey2 1 British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK 2 Channel Coastal Observatory, National Oceanography Centre Southampton, European Way, Southampton SO14 3ZH, UK * Corresponding Author ABSTRACT: Recent advances in marine acoustic survey and land-based topographic monitoring technologies have resulted in increasingly cost-effective data acquisition in coastal areas. The DEFRA-funded National Network of Regional Coastal Monitoring Programmes of England are, for example, utilising swath bathymetry and airborne light detection and ranging (LiDAR) technology more routinely to survey the coastal zone around the coastline of England. The demand for data processing, visualisation and interpretation techniques to keep pace with such advances in data acquisition is clear. This study discusses collection and processing techniques for such data on the south coast of Dorset, England, which have enabled the production of a seamless, high spatial resolution digital elevation model across the coastal zone. Case studies demonstrate how this eleva- tion model can be viewed and analysed using state-of-the-art digital techniques to allow geological mapping to be extended from onshore to offshore in unprecedented detail, effectively eliminating what is known as the ‘White Ribbon’ for coastal geological mapping. The potential for rolling out such techniques for wider surveying programmes across many environmental disciplines is signifi- cant, which could contribute towards improving the multi-disciplinary scientific evidence base in the complex coastal zone. KEY WORDS: bathymetry, coastal management, digital visualisation, landslides, laser scanning, LiDAR, MAREMAP, marine planning, virtual field surveying The collection of high spatial resolution elevation information dominated areas (Rosser et al. 2005; Colenutt et al. 2013). In in the coastal zone has become more widespread in the last ten adjacent offshore areas, additional surveying techniques such years. For example, the majority of the southern UK coast is as seabed sampling, acoustic backscatter (Ulrick 1982) and now covered by onshore airborne light detection and ranging shallow seismic surveys also provide additional layers of infor- (LiDAR) data at up to 1 m spatial resolution, extending from mation to aid further detailed scientific interpretations, which the low water mark to up to several kilometres inland (see the in turn enable better coastal management (Colenutt et al. Channel Coastal Observatory web service: www.channelcoast. 2013). org). Over 30 % of the southern UK coastline is also covered A direct application of such high quality observational in- by multibeam swath bathymetry data of similar spatial resolu- formation is improvement in geomorphological and geological tion, which often overlaps or joins with the airborne LiDAR surveys to act as a baseline for better coastal characterisation data to provide continuous elevation surface coverage from (Brooke et al. 2010). The underlying aim is to deliver a con- onshore to offshore. The collection of such information is tinuous data collection and derived surveying profile through facilitated by the DEFRA-funded National Network of Re- the nearshore environment, which is often lacking in such gional Monitoring Programmes of England (Bradbury et al. information and consequently sometimes referred to as the 2002). Similar elevation data have been shown in other loca- ‘White Ribbon’ (Mason et al. 2006; Leon et al. 2013). Given tions to be highly suitable to coastal research and management the high levels of human activity in this coastal zone, a fuller activities (Klemas 2013; Leon et al. 2013), and this contribu- representation of environmental factors such as geology is tion demonstrates how such data can be used for detailed geo- clearly desirable and the novel techniques presented here aim logical mapping studies. to show how this could be tackled. In a wider sense, such im- Ground-based laser scanning and aerial photography at proved surveying can contribute towards the multi-disciplinary high spatial and temporal resolution, for example, down to scientific evidence base required by Government for the centimetres and with annually repeated surveys, are also being management of coastal erosion risk and geohazards, develop- used increasingly to focus on specific issues in the coastal zone, ment of environmental policy, integration of terrestrial and such as coastal flooding in low lying areas (Cobby et al. 2001; marine planning regimes, and sustainable use and conservation Coveney & Fotheringham 2011) and slope instability in cliff- of coastal and marine resources (Colenutt et al. 2013). 6 2015 BGS/NERC. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:// creativecommons.org/licenses/by/3.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original Downloadedwork from is properlyhttps://www.cambridge.org/core cited. doi:10.1017/S1755691015000134. IP address: 170.106.40.139, on 27 Sep 2021 at 22:43:27, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S1755691015000134 264 KEITH WESTHEAD ET AL. Figure 1 Location map. Red rectangles show outline of case study areas at Lyme Regis (Fig. 2) and Worbarrow Bay (Fig. 4). This contribution uses two case examples from the Dorset laborative project involving the Dorset Wildlife Trust, the coastline of southern England to demonstrate how such multi- Maritime and Coastguard Agency, CCO and the Royal Navy, spatial- and temporal-resolution elevation information can be with major funding from the Viridor Credits Environmental combined and used for detailed geological mapping studies. Company. Other partners include Natural England, the Dorset These case studies are located at Lyme Regis and Worbarrow Strategic Partnership, the National Oceanography Centre and Bay (Fig. 1), both well-known localities on the ‘Jurassic Coast’, the University of Southampton. The airborne LiDAR data in which was declared a World Heritage Site by UNESCO in both case studies, extending in a strip to approximately 2 km 2001. This work includes the use of innovative digital techni- onshore, were collected by the Environment Agency and the ques for visualisation and spatial analysis. The potential of unfiltered data used to generate a terrain model that still this approach to support improved understanding of coastal includes vegetation and building features. All of this airborne geohazards such as landsliding is demonstrated, as well as the LiDAR and bathymetry data has been made available via the wider implications for coastal management and research. CCO through their web services under the Open Government Licence. Ground-based laser scanning data, of the type used in the 1. Data methodology: processing and visualisation Lyme Regis case study (Fig. 3), have also been collected by the CCO since 2012 as an enhancement to ongoing coastal The complex, multi-scalar, multi-format nature of observational monitoring work. spatial data in the coastal zone requires a significant amount of These elevation data have been brought together in this processing to maximise its scientific interpretation potential. study with existing British Geological Survey (BGS) mapping The airborne LiDAR, bathymetry and ground-based laser information, as part of the Marine Environmental Mapping scan datasets discussed here are frequently viewed separately, Programme (MAREMAP: www.maremap.ac.uk), to underpin but the real power comes from their integration and simul- a fresh approach to visualisation and surveying of geology and taneous, three-dimensional viewing. The following section de- geomorphology in the coastal zone. scribes how data from the Dorset coast have been accessed, This integrated approach to data collection, delivery and processed and visualised with this aim in mind. The resulting interpretation reflects the growing demand for and availability continuous elevation surface forms the basis for seamless of high resolution data for environmental analysis of the coast. coastal geological interpretation, as demonstrated in the case This is, in turn, related to the need for improved management studies. and monitoring of the effects of interaction between natural and human-induced changes in the coastal zone. 1.1. Data sources The elevation data used in this study are derived principally 1.2. Data processing through the DEFRA-funded Strategic Regional Coastal Moni- For the first stage of processing in this study, the airborne toring Programmes of England, managed and delivered under unfiltered LiDAR and higher resolution bathymetric data were the Open Government Licence by the Channel Coastal Obser- obtained from the CCO as a series of ASCII ‘.asc’ grid files of vatory (CCO) (Bradbury et al. 2002). The CCO data manage- 1 m spatial resolution, ranging in collection dates from 2007 to ment centre is hosted by the New Forest District Council, in 2010. This included the nearshore bathymetry data at Lyme partnership with the University of Southampton and the Na- Regis and the DORIS bathymetry data at Worbarrow
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