Laser scanning of fine scale pattern along a hydrological gradient in a peatland ecosystem

Anderson, Karen; Bennie, Jonathan; Wetherelt, Andrew

doi:10.1007/s10980-009-9408-y

Cited by 28 publications

(48 citation statements)

References 34 publications

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“…Seagrasses at our study site lie flat on the sediment when the tide is out, and so do not raise more that 2 cm above the sediment surface. Although shadowing was nonexistent in our application due to the gentle nature of site topography and the lack of erect vegetation, it could pose a serious challenge in densely vegetated sites [24].…”

Section: Effectiveness Of Tlsmentioning

confidence: 98%

“…This limited our useful scan radius to approximately 50 m. Our implementation of TLS afforded sufficient mapping extent to address the questions of our study, but would not be suitable for larger mapping projects. Some researchers have extended the useful range of scans by elevating the scanner to considerable heights above the sediment surface, e.g., [24], and recently, by developing mobile TLS platforms, e.g., [43].…”

Section: Effectiveness Of Tlsmentioning

confidence: 99%

“…With this technique, sediment disturbance can be limited to the scanner location while remotely measuring undisturbed areas. While TLS has mostly been applied to industrial and engineering studies [21], terrestrial ecological applications include tree allometry [22], measurement of leaf area index [23], and characterizing peatland morphology [24,25]. To date, there are few examples of TLS studies in intertidal areas, but it has been used to measure marsh morphology [26], and tidal stream channels [27].…”

Section: Introductionmentioning

confidence: 99%

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Terrestrial Laser Scanning Reveals Seagrass Microhabitat Structure on a Tideflat

Hannam

Moskal

2015

Remote Sensing

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Local-scale environmental heterogeneity can provide microhabitats that influence the spatial distribution of competing species. Microhabitats may influence the distribution of seagrasses along elevation gradients, but difficulty measuring intertidal microtopography has hindered quantification. Using a terrestrial laser scanner (TLS), we mapped and monitored a 1.84 ha study site for three years to understand spatial and temporal patterns of sediment microtopography. We performed high-accuracy GPS surveys and vegetation surveys of a native and an invasive seagrass. TLS provided sub-decimeter scale precision in digital elevation models (DEMs) of the tideflat. The location and shape of microtopographic features were stable from year to year, but the magnitude of local relief varied. A simple index of topographic context predicted the shoot density of the native seagrass, Zostera marina and the invasive seagrass, Zostera japonica, but the shoot density of the invasive seagrass was better predicted by the shoot density of Z. marina than by topographic context. Microtopographic relief at this site appears to exert a strong influence on the meter-scale distribution of seagrass. We demonstrate the potential for TLS mapping of habitat-relevant microtopography in a soft sediment intertidal environment where TLS faces substantial challenges but promises unique insights.Remote Sens. 2015, 7 3038

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Section: Effectiveness Of Tlsmentioning

confidence: 98%

Section: Effectiveness Of Tlsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Terrestrial Laser Scanning Reveals Seagrass Microhabitat Structure on a Tideflat

Hannam

Moskal

2015

Remote Sensing

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“…To achieve this, a differential GPS base station was first set-up at Cotehele (located at N50° 29.6898, W4° 13.5487) and left for 2 hours to collect data. Using receiver independent exchange format (RINEX) software differential corrections were made using the nearest UK Ordnance Survey vector difference corrections following the method described in Anderson et al, (2010). Upon returning to the site the base station was set-up with the determined DGPS co-ordinates.…”

Section: Dgps Surveymentioning

confidence: 99%

“…A pole-mounted roving DGPS receiver (HiPER Pro, Topcon) was then used to survey of the rest of the site against the determined base station position. The reported accuracies of the roving system were <10mm (horizontal) and <15mm (vertical; Topcon 2009 in Anderson et al, 2010). Key features describing the geometry of the site, such as corners of buildings and stone work, were collected with the roving receiver.…”

Section: Dgps Surveymentioning

confidence: 99%

Using Terrestrial Laser Scanning and Lidar Data for Photo-Realistic Visualisation of Climate Impacts at Heritage Sites

Nettley

Anderson

Silvey

et al. 2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Remote sensing technologies such as terrestrial laser scanning (TLS) and light detection and ranging (LIDAR) can now provide accurate spatial data for describing topographic patterns in landscapes and mapping the fine geometric detail of complex structures. Interdisciplinary studies using such data for characterising heritage sites are now widespread, but it is less common for data derived from these technologies to be used in an operational setting to 'engage' local people with the idea of future change. Threedimensional landscape models using TLS and LIDAR are a powerful way of communicating climate change to lay audiences on a local level and the use of multi-scale spatial data can help to show the anticipated impacts of climate change at heritage sites. The aim of this paper is to present the results of a project designed to produce a photorealistic geospatial model of the historic quayside at Cotehele Quay, Cornwall, UK. Our central aim was to generate a spatially accurate and visually realistic three-dimensional model of the site for use in local engagement strategies. TLS and LIDAR data were collected and processed to produce a three-dimensional model. The key image processing stages included: registration to a national co-ordinate system, meshing using 3D reshaper and visualisation creation in 3DS Max. The resulting model will permit spatial consideration of the impact of management strategies at the site. The over-arching application of this method beyond the study site will provide a platform for discussion that addresses the needs of site managers and the expectations of local communities. * ajn203@exeter.ac.uk

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Estimating aerodynamic roughness over complex surface terrain

et al. 2013

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[1] Surface roughness plays a key role in determining aerodynamic roughness length (z o ) and shear velocity, both of which are fundamental for determining wind erosion threshold and potential. While z o can be quantified from wind measurements, large proportions of wind erosion prone surfaces remain too remote for this to be a viable approach. Alternative approaches therefore seek to relate z o to morphological roughness metrics. However, dust-emitting landscapes typically consist of complex small-scale surface roughness patterns and few metrics exist for these surfaces which can be used to predict z o for modeling wind erosion potential. In this study terrestrial laser scanning was used to characterize the roughness of typical dust-emitting surfaces (playa and sandar) where element protrusion heights ranged from 1 to 199 mm, over which vertical wind velocity profiles were collected to enable estimation of z o . Our data suggest that, although a reasonable relationship (R 2 > 0.79) is apparent between 3-D roughness density and z o , the spacing of morphological elements is far less powerful in explaining variations in z o than metrics based on surface roughness height (R 2 > 0.92). This finding is in juxtaposition to wind erosion models that assume the spacing of larger-scale isolated roughness elements is most important in determining z o . Rather, our data show that any metric based on element protrusion height has a higher likelihood of successfully predicting z o . This finding has important implications for the development of wind erosion and dust emission models that seek to predict the efficiency of aeolian processes in remote terrestrial and planetary environments.

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Laser scanning of fine scale pattern along a hydrological gradient in a peatland ecosystem

Cited by 28 publications

References 34 publications

Terrestrial Laser Scanning Reveals Seagrass Microhabitat Structure on a Tideflat

Terrestrial Laser Scanning Reveals Seagrass Microhabitat Structure on a Tideflat

Using Terrestrial Laser Scanning and Lidar Data for Photo-Realistic Visualisation of Climate Impacts at Heritage Sites

Estimating aerodynamic roughness over complex surface terrain

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