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.
Results
Showing 1 to 20 of 25 for “"spatial aggregation"”.
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The Effects of Spatial Aggregation on Spatial Time Series Modeling and Forecasting
… of space-time modeling is determining the spatial scale of the data. This dissertation addresses the following three questions: 1) How does spatial aggregation impact the properties of the variable and its model? 2) What spatial scale of the data produces more accurate forecasts of the …
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Socio-spatial inequalities in late-stage cancer diagnosis in Illinois: spatiotemporal trends and methodological challenges
… dissertation examines the effects of social and spatial inequalities on late-stage diagnosis of colorectal and breast cancer, and it addresses several methodological challenges surrounding the use of ZIP codes as a study unit in analyzing late-stage cancer at diagnosis. Given that my dissertation …
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A Comparison of Imperviousness Derived from a Detailed Land Cover Dataset (DLCD) versus the National Land Cover Dataset (NLCD) at Two Time Periods
… over two time periods (2005/2006 and 2011) at spatial aggregation scales (fine to coarse) and scopes (site-specific to area-extent). When comparing the total impervious surface area, the NLCD overestimated the DLCD by appreciable amounts (12-27%) for the entire town and across all specified …
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Drivers of burn severity in the northern Cascade Range, Washington, USA
… of landscape burned at high severity, and spatial aggregation of the high-severity class. Nevertheless, the within-fire severity mosaic reflects the underlying topographic complexity. Fires in areas with greater topographical complexity had increased spatial complexity of burn severity. …
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Community detection on urban street networks : a segmentation model for urban logistics policy and planning
… as delivery territories or similar units of spatial aggregation, e.g., discrete demand zones, to be used in a study of urban freight distribution, extant community detection methods are assessed and adapted. Numerical experiments demonstrate that the sub-networks formed by these partitions …
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MapNexus : a framework to derive human intent from architectural space to enable context-aware information exchanges in a wireless intranet
… access point (AP). By using these APs as spatial aggregation units in a relational database, logical assumptions about short-term behavioral patterns can be modelled; this paper describes a method to capture, encode, and interpret context-aware cues. These cues are then utilized by an …
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Remote sensing, normalized difference vegetation index (NDVI), and crop yield forecasting
… models were developed for different level of spatial aggregation. Through the regression analysis, the thesis identified the relationship between the accumulation of crops’ “greenness” over the growing season and the final crops yield. The ultimate goal of the thesis is to examine whether the …
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Operational Dynamics of Technology Diffusion: Evidence From Patenting Data
… related to the ""geography of innovation"" or ""spatial clustering of innovations"". The relationship between innovation and geography is a topic of growing interest in both economics and regional science. The main questions are the extent to which knowledge spillovers (knowledge externalities) …
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Logical Data Structures for Spatial Analysis
… diversity with concomitant shifts in levels of aggregation and measurement, and a general lack of uniformity and compatibility among data structures. Database management systems support many data types and relationships among data records. They also provide the potential for integrating data …
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Characterizing drag and velocity within model mangrove forests of ordered and random tree arrangement
… and two random tree arrangements were studied. Spatial arrangements of the forests were described using the mean distance to nearest neighbor (NN) for all trees in a particular forest. The forest arrangements were also described using the spatial aggregation index developed by Clark and Evans. …
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Bus network sketch planning with origin-destination travel data
… origin-destination (OD) level analysis with new spatial aggregation methodologies, and develops a comprehensive framework for the identification of corridors for new bus services. In the context of this framework, this dissertation contributes several new methodologies. First, it proposes a …
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Localised Near Horizon Predictive Models of Cellular Load
… predict near horizon traffic loads in practical spatially contiguous coverage regions. 2. A novel application of near horizon localised prediction models to the problem of self-organising green networks. 3. Empirically created foundational models of how the network experiences load. 4. A novel …
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Modelling spatial strategies for the durable deployment of crop disease resistance
… challenge in modern agricultural epidemiology. Spatial diversification in the deployment of resistance genes, where susceptible and resistant fields are more closely intermixed, is predicted to drive lower epidemic intensities over evolutionary timescales. This is due to an increase in the …
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Civil conflict and international migration in Nepal
… paid to the endogeneity of emigration and to spatial spillover effects. In localities with a greater increase in emigration, the net enrolment rate in secondary education rises and child labour for older children decreases. A possible channel for this effect is that migration and remittances …
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Determining ground-level composition and concentration of particulate matter across regional areas using the Himawari-8 satellite
… determination of concentration. The Himawari-8 spatial resolution of 2 km is slightly coarse and further spatial aggregation or cloud masking would be detrimental to determining concentrations. Five dual-band BTD combinations, using all IR wavelengths, maximises the identification of …
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ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION
… abundance of plants of varying frequency and spatial heterogeneity on three control and three thinned-and-burned treatment units located within the western Montana block of the Fire and Fire Surrogates Project (FFS) — a large-scale investigation of the effects of fuel-hazard reduction …
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ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION
… abundance of plants of varying frequency and spatial heterogeneity on three control and three thinned-and-burned treatment units located within the western Montana block of the Fire and Fire Surrogates Project (FFS) — a large-scale investigation of the effects of fuel-hazard reduction …
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Advances in Software and Spatio-Temporal Modelling with Gaussian Processes
… Amongst these is the lack of need for spatial aggregation of data, which is especially relevant when data are sparse, as is the case with historical ocean SST data. In summary, this thesis contributes to the practical use of GPs through a set of abstractions that are useful in the …
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The effects of clonal reproduction on population demography, genetic structure, and mating pattern of <i>Dicentra canadensis</i>
… their parents, clonal reproduction can result in spatially aggregated ramets. Clustering of clones can reduce the frequency of pollen transfer between genets if pollinators tend to forage on nearby plants. In extreme cases, clustering of clones may prevent sexual reproduction, especially in plants …
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Sensitivity of Stormwater Management Solutions to Spatial Scale
… sensitivity of prediction accuracies to spatial resolution, four SWMM models of different spatial detail were developed for the Ballona Creek watershed, a highly urbanized watershed in the Los Angeles Basin, as a case study. Detailed uncertainty analyses were carried out for each model to …
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