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 3 of 3 for “"Thiessen Polygons"”.
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Three essays on sexual behaviour and sexually transmitted disease in the UK
… methods are tested to derive the denominator: Thiessen polygons, 15 mile boundaries, and 30 minute drive times. The study finds that the rates calculated are relatively insensitive to the method chosen and thus the simplest approach, the Thiessen polygons, is recommended. The analysis also …
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Exposure Assessment to Estimate the Population Exposed to Low Air Quality from Wildfires in Metro Vancouver, British Columbia, Canada
… were estimated using the indirect method of Thiessen polygons to obtain spatial coverage of the stations. Person-days of exposure to weighted average daily PM2.5 concentrations above the World Health Organization (WHO) recommended level of 15 μg/m3 were calculated considering days during the …
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A Cartographic Depiction and Exploration of the Boy Scouts of America's Historical Membership Patterns
The purpose of this thesis is to examine the historical membership patterns of the Boy Scouts of America (BSA) on a regional and council scale. Using Annual Report data, maps were created to show membership patterns within the BSA’s 12 regions, and over 300 councils when available. The examination …