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Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen

Theses and Dissertations

The influence of soil water repellency (WR) on vegetation recovery after a fire is poorly understood. This dissertation presents strategies to broaden opportunities for enhanced post-fire rangeland restoration and monitoring of burned piñon and juniper (P-J) woodlands by: 1) mapping the extent and severity of critical and subcritical WR, 2) determining the influence of WR on soil ecohydrologic properties and revegetation success, and 3) evaluating the suitability of a wetting agent composed of alkylpolyglycoside-ethylene oxide/propylene oxide block copolymers as a post-fire restoration tool for ameliorating the effects of soil WR and increasing seedling establishment. Results indicate that:

• Post-fire patterns …

Creation Of Soil Liquefaction Susceptibility Maps For San Luis Obispo & Marin Counties Using Geographic Information Systems., Amelia M. Lowman

Earth and Soil Sciences

Liquefaction of soils in response to earthquake shaking is a pressing issue in the state of California. Using Geographic Information Systems, Geological and lithology layers, along with criteria in order to separate out the data into four risk categories, a liquefaction risk assessment map was created for San Luis Obispo and Marin Counties. The accuracy of these maps was then assessed using liquefaction occurrences for San Luis Obispo County, and it was determined that while the map is somewhat accurate, in order to obtain a greater amount of accuracy and increase the usefulness of these maps, more data would need …

Tracing The "Enigmatic" Late Postclassic Nahua-Pipil (A.D. 1200-1500): Archaeological Study Of Guatemalan South Pacific Coast, Carlos A. Batres

Theses

This thesis addressed the Late Post-classic (A.D. 1200 - 1500) Nahua-Pipil of the central Pacific coast of Guatemala. It evaluated archaeological settlement plan data and ceramics in association with regional geography, and ethnohistorical accounts in conjunction with GIS tools for their analysis. The goal is to reconstruct Nahua-Pipil sociopolitical organization, testing the hypothesis that it was based on the Nahua altepetl system.

Predictive Modeling Of Sulfur Flower Buckwheat (Erigonum Umbellatum Torrey) Using Non-Parametric Multiplicative Regression Analysis, David B. Davis

Theses and Dissertations

Impacts of humans on ecosystems in western United States have necessitated ecological restoration, which includes the development of native seed that can be used for revegetation efforts. Development of such seed sources are costly and time consuming. This study describes the use of non-parametric multiplicative regression analysis (NPMR) to develop a predictive model for occurrence of sulfur-flower buckwheat (Eriogonum umbellatum Torrey) population seed collection. This perennial forb species is of interest for seed source development in the western United States. Presence and absence data for E. umbellatum was taken from the Utah Division of Wildlife Resources Big Game Range …

Accessibility In Metropolitan Transportation Planning : Visualizing A Gis-Based Measure For Collaborative Planning, Aditi Sarkar

Dissertations

Passed by the US Congress in 1995, the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU), requires Metropolitan Planning Organizations (MPOs) to further the trend of collaboration by employing visualization techniques for Transportation Improvement Programs (TIPs). In the first part of this two-part research, three New Jersey MPOs are investigated to understand how accessibility is considered by their organizations, how TIPs are evaluated, and how collaborative planning and visualization techniques are used to evaluate TIPs. In the second part of this study, a small segment of a MPO's jurisdiction is selected to develop a visualization of …

Visualizing And Modeling Mining-Induced Surface Subsidence, Marcor Gibbons Platt

Theses and Dissertations

Ground subsidence due to underground coal mining is a complex, narrowly-understood phenomenon. Due to the complicated physical processes involved and the lack of a complete knowledge of the characteristics of overlying strata, the reliability of current prediction techniques varies widely. Furthermore, the accuracy of any given prediction technique is largely dependent upon the accuracy of field measurements and surveys which provide input data for the technique. A valuable resource available for predicting and modeling subsidence is aerial survey technology. This technology produces yearly datasets with a high density of survey points. The following study introduces a method wherein these survey …

Energetic Path Finding Across Massive Terrain Data, Andrew N. Tsui

Master's Theses

Before there were airplanes, cars, trains, boats, or bicycles, the primary means of transportation was on foot. Unfortunately, many of the trails used by ancient travelers have long since been abandoned. We present a software tool which can help visualize and predict where these forgotten trails might lie through the use of a human-centered cost metric. By comparing the paths generated by our software with known historical trails, we demonstrate how the tool can indicate likely trails used by ancient travelers. In addition, this new tool provides novel visualizations to better help the user understand alternate paths, effect of terrain, …

A Spatial Analysis Of Demographic Factors Of West Nile Virus In Georgia, Sarah Bryant Boos

Public Health Theses

Background: West Nile Virus (WNV) is a serious mosquito-borne disease that can potentially lead to death. The purpose of this study is to spatially examine known risk factors for WNV within Georgia at the county level. The study produces maps that relate known WNV cases to high, medium, and low risk factor areas for additional analyses. Methodology: Cartographic visualization and statistical analysis software was used to examine the relationships between: the geographical distribution of age, race, gender, urbanicity, and population density of Georgians in relation to WNV cases by county. Chi-square analysis and odds rations were calculated to determine whether …

Measuring Accessibility And Explaining Trends In Commute Mode Choice In Washington, D.C. From 1970 - 2000, Jonathan Ryder

University of New Orleans Theses and Dissertations

This study attempts to find a correlation between commuting modes in Washington DC and characteristics of the city and the people that they serve. It investigates why some census tracts have experienced increases in the commuting share of alternative transportation, such as public transit, walking, and bicycling, while others haven't. Findings demonstrate that demographic variables such as percent Hispanic and foreign born were the strongest predictors of change in commute mode share followed by distance to train station. Land use variables demonstrated weak correlations with variations in mode share due most likely to a lack of density gradient within the …

Modeling Potential Native Plant Species Distributions In Rich County, Utah, Kathryn A. Peterson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Georeferenced field data were used to develop logistic regression models of the geographic distribution of 38 frequently common plant species throughout Rich County, Utah, to assist in the future correlation of Natural Resources Conservation Service Ecological Site Descriptions to soil map units. Field data were collected primarily during the summer of 2007, and augmented with previously existing data collected in 2001 and 2006. Several abiotic parameters and Landsat Thematic Mapper imagery were used to stratify the study area into sampling units prior to the 2007 field season.

Models were initially evaluated using an independent dataset extracted from data collected by …

Gis Spatial Analysis Of Multiple Scenes In Criminal Homicides, Casey C. Anderson

USF Tampa Graduate Theses and Dissertations

Anthropological studies of community structures and human relationships of today's societies are becoming increasingly important for crime analysis. Law enforcement agencies are often challenged with the task of connecting multiple locations to persons involved in crimes to solve cases. Using the structures of the target communities and the social relationship between the victim and offender, spatial distributions of crimes can be reconstructed.

Data used in this analysis were collected from Hillsborough County, Florida (n=420) and Lancaster County, Nebraska (n=48) law enforcement agencies within the years 1997-2007. The hypothesis of this paper is: if the social relationship between the victim and …

An Assessment Of The Impacts Of Relocation On Public Housing Youth, Emily Zupo

USF Tampa Graduate Theses and Dissertations

This paper will explore the social and economic impacts of public housing revitalization on households with minor children. The research traces the relocations of families from two public housing complexes to other public housing complexes or market housing, using Housing Choice formerly Section 8 vouchers. We contrast and compare the socioeconomic characteristics of the original neighborhoods to the relocation sites from the census tract level, exploring changes in resources available to families.

Stochastic Spatio-Temporal Uncertainty In Gis-Based Water Quality Modeling Of The Land Water Interface, Ahmad Mohamad Salah

Theses and Dissertations

Integrated water resources management has been used for decades in various formats. The limited resources and the ever growing population keep imposing pressure on decision makers to better-, and reliably, manage the available waters. On the other hand, the continuous development in computing and modeling power has helped modelers and decision makers considerably. To use these models, assumptions have to be made to fill in the gaps of missing data and to approximate the current conditions. The type and amount of information available can also be used to help select the best model from the currently available models. Advances in …

A Gis Safety Study And A County-Level Spatial Analysis Of Crashes In The State Of Florida, Ali Darwiche

Electronic Theses and Dissertations

The research conducted in this thesis consists of a Geographic Information Systems (GIS) based safety study and a spatial analysis of vehicle crashes in the State of Florida. The GIS safety study is comprised of a County and Roadway Level GIS analysis of multilane corridors. The spatial analysis investigated the use of county-level vehicle crash models, taking spatial effects into account. The GIS safety study examines the locations of high trends of severe crashes (includes incapacitating and fatal crashes) on multilane corridors in the State of Florida at two levels, county level and roadway level. The GIS tool, which is …

Gis-Based Tool For Assessing Hydraulic Performance Of Drainage Infrastructure System In El Paso, Gema L. Camacho

Open Access Theses & Dissertations

Maintaining a city's storm-water drainage infrastructure system can be an overwhelming effort, especially when data is inaccurate, incomplete, or located in disparate sources. This was the case for the City of El Paso. This research was part of a project funded by the City of El Paso to enhance their GIS storm drainage infrastructure system. For the first task of the project, the GIS software was used to store stormwater drainage data into one convenient GIS file. A GIS framework was created during the first phase of the project. This GIS database contained drainage data (such as location, material, dimensions, …

Ecological Risk Models For Visceral Leishmaniais [Sic] In Bahia, Brazil And Diagnosis Of Trypanosoma Cruzi Infection In Dogs In South Central Louisiana, Prixia Nieto

LSU Doctoral Dissertations

Three predictive models were developed within a geographic information system using earth observing satellite remote sensing (RS), the Genetic Algorithm for Rule-Set Prediction (GARP) and the growing degree day-water budget (GDD-WB) concept to predict the distribution and potential risk of visceral leishmaniasis (VL) in the State of Bahia, Brazil. The objective was to define the environmental suitability of the disease as well as to obtain a deeper understanding of the eco-epidemiology of VL by associating environmental and climatic variables with disease prevalence. The RS, the GARP model and the GDD-WB model, using different analysis approaches and with the same human …

Geophysical Survey Of Greenwood Cemetery, Orlando, Florida, Dennis Wardlaw

Electronic Theses and Dissertations

Advances in geophysical and remote sensing technology, specifically with ground penetrating radar (GPR) and geographic information systems (GIS), have led to increased use for archaeological research within cemeteries. Because of its non-invasive manner and high resolution of subsurface anomalies, GPR is ideal for surveying areas with marked or unmarked graves within cemeteries. Using a GIS assists cemetery research by facilitating integration of datasets and projection of spatial data. What has not been attempted to this point is systematic attempting to correlate detection rates of marked graves using a GPR with the time frame of the grave while incorporating the data …

The Driving Force: A Comparative Analysis Of Gang-Motivated, Firearm-Related Homicides, Christa Polczynski

Electronic Theses and Dissertations

The knowledge of gang homicides is constantly increasing, but one aspect of gangs rarely studied is drive-by shootings (Dedel 2007; Hutson, Anglin, and Pratts 1994; Hutson, Anglin, and Eckstein 1996; Polczynski 2007; Sanders 1994; Sugarmann and Newth 2007). In this paper are comparative analyses of gang-motivated, firearm-related homicides perpetrated through a drive-by shooting to those which are not perpetrated through a drive-by shooting, by spatial and regression analyses. The data used for the analyses are a combination of incident variables, such as victim, offender, and incident characteristics, as well as social and economic characteristics of the communities in which the …

Glacier Monitoring In Ladakh And Zanskar, Northwestern India, Martin Edward Byrne

Graduate Student Theses, Dissertations, & Professional Papers

Glaciers in the Himalaya are often heavily covered with supraglacial debris, making them difficult to study with remotely-sensed imagery alone. Various methods such as band ratios can be used effectively to map clean-ice glaciers; however, a thicker layer of debris often makes it impossible to distinguish between supraglacial debris and the surrounding terrain. Previously, a morphometric approach employing an ASTER-derived digital elevation model (DEM) has been used to map glaciers in the Khumbu Himal and the Tien Shan. This project aims first to test the ability of the morphometric procedure to map small glaciers; second, to use the morphometric approach …

Spatio-Temporal Dynamics Of Biomes In The Northwestern United States (9000 Ybp To The Present), Christopher Caleb Stump

Graduate Student Theses, Dissertations, & Professional Papers

The goal of this study was to quantitatively analyze and map the vegetation composition of forest, grassland, and steppe ecosystems in the northwestern United States in the present and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen percentages from recent sediment cores reflecting modern vegetation assemblages and climates to evaluate the amount of influence of selected environmental variables on present species distributions. The fossil analysis used non-metric multi-dimensional scaling (NMDS) on a merged database containing relative pollen percentages from the last 9000 years. A predefined list of environmental parameters and floristically and ecologically …

Brownfield Redevelopment In London, Ontario: Developing A Methodology For A Brownfield Database And An Examination Of Policy Initiatives Aimed At Promoting Redevelopment, Michael Hayek

Digitized Theses

Brownfield redevelopment, because of its contributions to urban sustainability and environmental quality, has become a critical issue on cities* policy agendas and in urban development literature of late. There have been no studies examining the issue of brownfield redevelopment in London, Ontario, Canada nor have there been any studies that detail a method to create a city-wide inventory of brownfield sites. This research has three main objectives: to develop a GIS based methodology for creating a brownfield inventory; through interview analysis, indentify the barriers to successful brownfield redevelopment in London; and to determine whether or not the financial incentives in …

Development Of A Gis Database For Water Resources Management In Ajman Emirate, Uae., Mohammad Rehan Yusuf

Theses

The lack of freshwater resources represents a major constraint against the sustainable development in arid and semi-arid regions. Because of the scarcity and randomness nature of rainfall in arid regions, surface water resources are almost absent. Groundwater resources are always under stress and in many cases do not suffice the water demands for different sectors. Desalination plants are widely constructed to substitute for the water shortage. The UAE, including Ajman emirate, is witnessing a rapid development in the industrial, commercial, construction and agricultural fields which has led to a tremendous increase in water demands.

Proper management of the limited water …