Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Spatial association"”.
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Modifying a local measure of spatial association to account for non-stationary spatial processes.
… large area data sets, many study areas exhibit spatial non-stationarity or spatial variation in mean and variance of observed phenomena. This poses issues for a number of spatial analysis methods which assume data are stationary. The Getis and Ord’s Gi* statistic is a popular measure that, like …
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Spatial association in archaeology. Development of statistical methodologies and computer techniques for spatial association of surface, lattice and point processes, applied to prehistoric evidence in North Yorkshire and to the Heslerton Romano-British site.
… investigates the concepts of archaeological spatial association within the context of both site and regional data sets. The techniques of geophysical surveying, surface distribution collection and aerial photography are described and discussed. Several new developments of technique are …
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Quantifying spatial association between mineral deposits and geology across three African crustal segments of different age, with implication for secular change in mineralization during earth history
… compared to the younger crust. A measure of spatial association (spatial coefficient), based on the WotE approach, is also used to 'fingerprint' the met I endowment in the three selected regions of African crust. The patterns of the mineral deposits distribution within all regions shows that …
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Spatio-Temporal Cluster Detection and Local Moran Statistics of Point Processes
<p>Moran's index is a statistic that measures spatial dependence, quantifying the degree of dispersion or clustering of point processes and events in some location/area. Recognizing that a single Moran's index may not give a sufficient summary of the spatial autocorrelation measure, a local …
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Social behaviour of captive belugas, Delphinapterus leucas
… distances were used to quantify patterns of spatial association. A set of social behaviours for which actor and recipient could be identified was defined to characterize dyadic interactions. The mother-calf pair spent more time together, and interacted more often than adults. The calf …
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Responsibly Emboldening Predictions via Boldness-Recalibration
… we extend the methods to account for underlying spatial association in the data and demonstrate via a case study on moose presence.
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Plant Community Invasibility in Riparian Landscapes: Role of Disturbance, Geomorphology, and Life History Traits
… and persistence. The second chapter examines the spatial association of beavers, <italic>Tamarix</italic>, and <italic>Salix</italic> and the hypothesis that beavers may contribute to <italic>Tamarix</italic> dominance through selective foraging of <italic>Salix</italic>. The third chapter …
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The spatial autocorrelation of individual tree characteristics in loblolly pine stands
Mathematical methods of assessing the spatial autocorrelation associated with individual tree characteristics in forest stands were identified. These measures were used to investigate the spatial autocorrelation of discrete tree characteristics including the species, product, and defect …
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Spatiotemporal Drivers of Municipal Water Consumption
… models and measures of global and local spatial association were combined to determine which landscape characteristics significantly influenced per capita municipal water consumption at the county scale, whether or not the statistically significant landscape characteristics varied over …
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Spatial-Longitudinal Bent-Cable Model with an Application to Atmospheric CFC Data
Spatial data (also called georeferenced data) arise in a wide range of scientific studies, including geography, agriculture, criminology, geology, urban and regional economics. The underlying spatial effects – the measurement error caused by any spatial pattern embedded in data – may affect both …
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Analysis and interpretation of clustered microseismicity at geothermal and petroleum reservoirs
… a hydraulic fracture that exhibited strong spatial asymmetry. Analysis of the results suggest that the phenomenon of "screenout" may be one mechanism contributing to the observed seismicity's spatial and temporal characteristics and the direction of the asymmetric failure may be related to …
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Spatial analysis of cycling risk in Helsinki using crowdsourced risk exposure data
… risk exposure data on a 500 m x 500 m grid. Spatial heterogeneity of the risk data was assessed using global Moran’s I statistics, followed by local indicators of spatial association statistics to locate significant high-risk clusters. Subsequently, both global and local regression models …
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Mortgage Default in Southern California: Examining Distressed Borrower's Decision Making and Market Contagion
… hypothesis.</p> <p>The next section studied spatial association of short sales and REO to see if any contagion effects were present. It was found that both short sales and REO form into clusters of hot and cold spots. Social stigma is believed to impact consumer behavior, the theory was …
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Ecological consequences of genetic variation in foraging behaviors of a predatory mite
… phenotypes interacted differently with prey in a spatially complex landscape. All foraging traits were comparable in terms of predator-prey densities and plant damage; but they were lower than the unselected control. Spatial association and correlation analysis showed that all foraging traits were …
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The effects of fault-induced stress anisotropy on fracturing, folding and sill emplacement: Insights from the Bowie coal mines, southern Piceance basin, western Colorado.
… to fault strike. In addition, the varying spatial association of these fault-perturbed cleat styles with the fault may provide a qualitative estimate of fault location while mining. Pre-existing faults also strongly control reactivation-related folding, which at formed several low-amplitude …
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Death, disability, and diversity: An investigation of physical impairment and differential mortuary treatment in Anglo-Saxon England
… noted. In three early Anglo-Saxon cemeteries, spatial association between individuals with physical impairment, non-adults, and females was observed. Early Anglo-Saxon individuals with physical impairment were more frequently buried in marginal locations, and two such individuals were buried in …
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Weibull mixture model for grouped data and pattern identification in spatial and spatial-temporal data.
… robust models for detecting outliers in a large spatial-temporal dataset that contains daily ground deformation values in a New York City tunnel excavation project. Systematic outliers and random outliers are defined and identified using robust spatial kriging models and robust time series …
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Know your place - Social network analysis in cooperatively breeding white-winged choughs (Corcorax melanorhamphos)
… the Canberra area and constructed networks from spatial association data to give values for two group-level and three individual-level social network measures. The two group-level social network measures were the extent of their assortative behaviour based on their traits (assortativity) and …
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Know your place - Social network analysis in cooperatively breeding white-winged choughs (Corcorax melanorhamphos)
… the Canberra area and constructed networks from spatial association data to give values for two group-level and three individual-level social network measures. The two group-level social network measures were the extent of their assortative behaviour based on their traits (assortativity) and …
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Some aspects of the geochemistry of high-temperature peridotites and megacrysts from the Jagersfontein kimberlite pipe, South Africa
… of equilibration (51±2 kbar), indicating their association with a thermal perturbation and supporting a close spatial association between them. Olivine and pyroxenes in the high-temperature peridotites appear homogeneous, but compositional gradients were observed in several garnet …
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