A5058611103- Geographic Information Systems Studies
- Cryospheric studies and observations
- Remote Sensing and LiDAR Applications
- Landslides and related hazards
- Geology and Paleoclimatology Research
- 3D Surveying and Cultural Heritage
- Geochemistry and Geologic Mapping
- Satellite Image Processing and Photogrammetry
- Soil erosion and sediment transport
- Climate change and permafrost
- Geological formations and processes
- Flood Risk Assessment and Management
- Geological Modeling and Analysis
- Ionosphere and magnetosphere dynamics
- Winter Sports Injuries and Performance
- Robotics and Sensor-Based Localization
- Manufacturing Process and Optimization
- Archaeological Research and Protection
- Solar and Space Plasma Dynamics
- Land Use and Ecosystem Services
- Geography Education and Pedagogy
- Maritime and Coastal Archaeology
- Soil Geostatistics and Mapping
- Data Visualization and Analytics
- Remote-Sensing Image Classification
University of Exeter
2011-2025
Royal Geographical Society
2017-2024
University of Ulster
2021-2024
University of Plymouth
2018-2021
University of Nottingham
1996-2020
University of New Hampshire
2017-2020
National Security Agency
2018
Kingston University
2008-2017
North Dakota Game and Fish Department
2017
Emporia State University
2013-2016
Surface roughness is an important geomorphological variable which has been used in the Earth and planetary sciences to infer material properties, current/past processes, time elapsed since formation. No single definition exists; however, within context of geomorphometry, we use surface as expression variability a topographic at given scale, where scale analysis determined by size landforms or geomorphic features interest. Six techniques for calculation were selected assessment parameter's...
(1997). Close range photogrammetry and machine vision. Survey Review: Vol. 34, No. 266, pp. 276-276.
Abstract Digital elevation models (DEMs) are increasingly used for landform mapping, particularly with the growing availability of national and global datasets. In this paper we describe a variety techniques that can visualize DEM. We then compare five to ascertain which performs most complete unbiased visualization. assess visualization by comparing landforms mapped from them against detailed morphological map (derived mapping multi‐azimuth relief‐shaded DEMs cross‐checked stereo aerial...
Remotely sensed imagery has been used extensively in geomorphology since the availability of early Landsat data, with its value measurable by extent to which it can meet investigative requirements geomorphologists. Geomorphology focuses upon landform description/classification, process characterization and association between landforms processes, while remote sensing is able provide information on location/distribution landforms, surface/subsurface composition surface elevation. The current...
Aerial image capture has become very common within the geosciences due to increasing affordability of low-payload (<20 kg) unmanned aerial vehicles (UAVs) for consumer markets. Their application surveying subsequently led many studies being undertaken using UAV imagery and derived products as primary data sources. However, quality principles are seldom given rigorous discussion. In this contribution we firstly revisit underpinning concepts behind capture, from which requirements acquiring...
Mapping or "delimiting" landforms is one of geomorphology's primary tools. Computer-based techniques such as land-surface segmentation allow the emulation process manual landform delineation. Land-surface exhaustively subdivides a digital elevation model (DEM) into morphometrically-homogeneous irregularly-shaped regions, called terrain segments. Terrain segments can be created from various parameters (LSP) at multiple scales, and may therefore potentially correspond to spatial extents...
Abstract This paper highlights the requirement for very high resolution (<0·25 m) elevation data quantitative and qualitative morphometric analyses. Traditional techniques capture (e.g. airborne, heliborne) are prohibitively expensive small studies therefore a kite‐based platform was developed, in conjunction with consumer non‐metric digital camera, capture. The combination of kite camera is more generally termed aerial photography (KAP). accuracy derived by photogrammetry imagery...
Abstract Geomorphologically mapped data form a primary set of observations that can be used to infer former environmental conditions. Thus, objective and consistent mapping landforms from remotely sensed (e.g. satellite imagery, digital elevation models (DEMs)) is paramount for reconstructing palaeoenvironments. This paper proposes technique, ‘residual relief separation’, enhance in DEMs prior visualization mapping. applied ∼600 km 2 region surrounding Lough Gara, Ireland, where drumlins...
Abstract Soil erosion, rapid geomorphological change and vegetation degradation are major threats to the human natural environment. Unmanned Aerial Systems (UAS) can be used as tools provide detailed accurate estimations of landscape change. The effect flight strategy on accuracy UAS image data products, typically a digital surface model (DSM) orthophoto, is unknown. Herein different flying altitudes (126-235 m) area coverage orientations (N-S SW-NE) assessed in semi-arid medium-relief where...
Abstract: This article provides an analysis of gradient and curvature constraints on path form length, with particular reference to road, rail, pipeline route selection. Initially, we examine the case a single (global) constraint planar surface, or without boundaries obstacles. leads consideration surface representation using rectangular lattices procedures for determining shortest gradient-constrained paths across such surfaces. Gradient-constrained distance transforms are introduced as new...
Abstract Background Exercise stress echocardiography (ESE) provides a non-invasive estimation of diastolic function during exercise and can provide insight into systolic-diastolic coupling response. Current protocols are confounded by individual variation in fitness tolerance, which turn leads to ESE normative data being difficult define. Aims This study aims use describe the relationship between systolic left ventricular healthy volunteers using physiologically defined personalised...
Abstract Background Pulmonary artery pressure (PAP) response to exercise is frequently investigated in a wide range of heart disease. Yet, there remains grey area, especially special groups such as athletes, where normal PAP not well defined. This mainly due how current ESE protocols do account for individual variability cardiorespiratory fitness and tolerance, which introduces biases. Additionally, non-invasive estimation at technically challenging, peak exertion. Aims study aims describe...
Mapped topographic features are important for understanding processes that sculpt the Earth's surface. This paper presents maps primary product of an exercise brought together 27 researchers with interest in landform mapping wherein efficacy and causes variation were tested using novel synthetic DEMs containing drumlins. The between interpreters (e.g. philosophy, experience) across study region woodland prevalence) opens these factors up to assessment. A priori known answers synthetics...
Spectral unmixing is a key process in identifying spectral signature of materials and quantifying their spatial distribution over an image. The linear model expected to provide acceptable results when two assumptions are satisfied: (1) mixing should occur at macroscopic level (2) Photons must interact with single material before reaching the sensor. However, these do not always hold more complex nonlinear models required. This study proposes new hybrid method for switching between...
Sediments beneath modern ice sheets exert a key control on their flow, but are largely inaccessible except through geophysics or boreholes. In contrast, palaeo-ice sheet beds accessible, and typically characterised by numerous bedforms. However, the interaction between bedforms flow is poorly constrained it not clear how bedform sizes might reflect conditions. To better understand this link we present first exploration of variety statistical models to explain size distribution some common...