A5008812095- Geographic Information Systems Studies
- Data Management and Algorithms
- Land Use and Ecosystem Services
- Heavy metals in environment
- Geochemistry and Geologic Mapping
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Environmental and Social Impact Assessments
- Soil and Land Suitability Analysis
- Soil and Water Nutrient Dynamics
- Air Quality and Health Impacts
- Coastal wetland ecosystem dynamics
- Peatlands and Wetlands Ecology
- Semantic Web and Ontologies
- Remote Sensing and LiDAR Applications
- Soil Geostatistics and Mapping
- Atmospheric and Environmental Gas Dynamics
- Toxic Organic Pollutants Impact
- Remote Sensing in Agriculture
- African Botany and Ecology Studies
- Economic and Environmental Valuation
- Mediterranean and Iberian flora and fauna
- Water Quality and Pollution Assessment
- Bioenergy crop production and management
- Agricultural Economics and Policy
Njala University
2017-2025
Cranfield University
2018
Royal Botanic Garden Edinburgh
2014
UK Centre for Ecology & Hydrology
2003-2012
University of Strathclyde
2012
Lancaster University
2009-2010
University of Leicester
2002-2006
Natural Environment Research Council
2003
National Oceanography Centre
2002
Newcastle University
1994
1. The existence of a hierarchical scheme environmental controls on the spatial distribution plant species was explored for three non‐indigenous weeds, Fallopia japonica , Heracleum mantegazzianum and Impatiens glandulifera in British Isles. 2. Logistic regression analyses presence/absence weed examined relative importance 60 variables, encompassing land cover, geology climate. Analyses were undertaken using variables assessed at hectad (10 × 10 km) or tetrad (2 2 resolution national...
BIOPRESS (‘Linking Pan-European Land Cover Change to Pressures on Biodiversity’), a European Commission funded ‘Global Monitoring for Environment and Security’ project, produced land cover change information (1950—2000) Europe from aerial photographs tested the suitability of this monitoring habitats biodiversity. The methods results related work are summarized. Changes in were established through 73 window 59 transect samples distributed across Europe. Although sample size was too small...
Abstract Marburg virus (MARV) causes sporadic outbreaks of severe disease (MVD). Most MVD originated in East Africa and field studies Africa, South Zambia, Gabon identified the Egyptian rousette bat (ERB; Rousettus aegyptiacus ) as a natural reservoir. However, largest recorded outbreak with highest case–fatality ratio happened 2005 Angola, where direct spillover from bats was not shown. Here, collaborative by Centers for Disease Control Prevention, Njala University, University California,...
1. This paper examines the circumstances under which control programmes may reduce range of two widespread invasive weeds riparian habitats: Impatiens glandulifera (Himalayan balsam) and Heracleum mantegazzianum (giant hogweed). 2. The spread both species was modelled using MIGRATE, a spatially explicit model that incorporates realistic demographic parameters multiple dispersal mechanisms. Simulations scenarios were run within geographical information system (GIS) authentic landscapes based...
Much geographic information is an interpretation of reality and it possible for multiple interpretations to coexist. This unproblematic the research community but, as numbers users increase through initiatives resulting in data integration on unprecedented scale, such E-science GRID, issues meaning conceptualisation become more important. We explore these mapping land cover variety conceptions land-cover features that may be held by actors creation, distribution, use information. Current...
Abstract Spatially coincident land-cover information frequently varies due to technological and political variations. This is especially problematic for time-series analyses. We present an approach using expert expressions of how the semantics different datasets relate integrating temporal time series where classification classes have fundamentally changed. use mapping in UK (LCMGB LCM2000) as example data sets because extensive object-based meta-data LCM2000. Inconsistencies between two can...
Malaria is a significant health challenge in Sierra Leone, particularly affecting pregnant women and children under five years of age. Despite efforts to reduce malaria cases, its prevalence remains high. The Leone National Elimination Strategic Plan (NMESP) 2021-2025 aims the burden significantly through universal access Insecticide Treated Nets (ITNs). This study evaluates knowledge utilization ITNs for control Moyamba Bo districts (at Njala University's Main Campus District Towama...
This study investigates the impact of human activity on diversity, abundance, and species composition trees in southwestern Sierra Leone's Kasewe Forest Reserve. The specific objectives are to assess historical use <i>Guibourtia copallifera</i> relation reserve examine community relations with this species. Primary data were collected through a floristic inventory key informant interviews, focusing forest land floral resources. A total 1,294 living...
This article is concerned with data and classifications that confuse the concepts of land cover use. conceptual confusion problematic for integration has resulted in calls separation use from global monitoring community (GLP Citation2005). Text mining used to unravel different embedded semantics applied legal definitions forest Whilst results show distinct biological dimension descriptions socioeconomic character use, they reveal deep degree semantic descriptions. The implications this lack...
PBDE contamination in terrestrial biota is poorly characterized, and robust data on temporal trends are scarce. We measured (1985-2007) spatial the eggs of sparrowhawk (Accipiter nisus), a sentinel for environment. Five BDEs were most abundant (BDE 99 > 47 153 100 154). Their concentrations, that sum PBDEs (ΣPBDE), increased from mid-1980s, peaking midlate 1990s at levels sustained until end study. This predominance BDE99 contrast with patterns piscivorous species suggest sparrowhawks,...
Airborne remote sensing with a Compact Spectrographic Imager (CASI) and Daedalus Thematic Mapper (ATM) has been used to map sediment types biotic associations for the intertidal zone along 270 km of coastline from Humber Estuary North Norfolk, UK within LOIS BIOTA (Land-Ocean Interaction Study, Biological Influences On interTidal Areas) programme. This allows field-based sedimentary information be extrapolated provide modelling coastal processes erosion accretion. The method adopted image...
Disturbance events, such as fire, have a major impact on boreal forest dynamics, succession, and the global carbon cycle. Methods using satellite imagery are well established for detecting fires in real time mapping burned area (fire scars) within one year of fire. This paper focuses detection older fire disturbance-regeneration patterns forests Canada. Previous work found that shortwave-infrared image segmentation proved particularly good at creating uniform regions were easy to associate...
Abstract Information derived from remotely sensed data is increasingly being used to describe land cover and landscape structure for a range of applications. Users in different disciplines may use this information, although they have perceptions those who created the information. They be unaware origin information or its meaning treat it as if were data. Current paradigms reporting meta‐data quality do not adequately communicate producer's knowledge, should extended conceptual, semantic...
A semantic, statistical approach to reconciling data with different ontologies is introduced. It was applied UK land cover datasets from 1990 and 2000 in order identify change. The combined expression of expert opinion about how the semantics two relate spectral homogeneity metadata. sample changes identified assessed by field validation. Change 41 percent visited parcels, all false positives were found be due classification error either dataset. Thus, reliably identifies inconsistency...