Social and Behavioral Sciences Commons^™

Monitoring Land-Cover Change In The Las Vegas Valley: A Study Of Five Change Detection Methods In An Urban Environment, Bonnie Diane Weidemann

Theses and Dissertations

Change detection is currently a topic of great interest to theoretic geographic researchers. The necessity to map, monitor, and model land cover change is also important to a variety of applied fields as varied as urban planning and military intelligence. This research compares five algorithms to map urban land cover change in the greater Las Vegas, Nevada metropolitan area. Landsat Thematic Mapper imagery acquired on May 1990 and May 2000 was used as the primary data. The change detection methods yielded simple maps of change vs. no change. These algorithms included image differencing, image ratioing, image regression, vegetation index differencing, …

Decadal Changes And Future Projections Of Precipitation In The Metropolitan Area Of Milwaukee, Anke Petra Maria Keuser

Theses and Dissertations

This research investigated decadal changes and future projections of precipitation in the Metro Milwaukee and surrounding area, the largest urban area in Wisconsin. Spatial and temporal precipitation patterns derived for the Metro Milwaukee from the high-resolution gridded historical climatic dataset for Wisconsin were analyzed for 1950-2006. In addition, precipitation scenarios were generated via statistical downscaling of the Third Generation Coupled Global Climate Model (CGCM3) outputs. The delta method was chosen for the statistical downscaling of the CGCM3 output for the two future time periods, 2041-2070 (2050s) and 2071-2100 (2080s). The Mann-Kendall test and the Sen's slope test were applied to …

Access To Spatial Data: The Political Power Of Legal Control Mechanisms, Patrice A. Day

Theses and Dissertations

According to the U.S. Supreme Court (Island Trees School District v. Pico, 457 U.S. 853, 1982), the Constitution presupposes that the free flow of information between the government and the public is essential to maintaining an informed citizenry, which in turn is essential to holding governments accountable. However, local governments are increasingly using various legal mechanisms to limit public access to geographic information (GI), and this in turn can potentially disrupt this balance. Licensing and copyright are two such mechanisms that local government agencies are using to limit GI access and distribution.

If information is power, whoever controls information, controls …

Modeling Intermittent And Perennial Headwater Stream Origins In North Carolina., Kevin Macleod

Theses and Dissertations

Low-order headwater streams, a link between the upland landscape and larger streams within a watershed, affect watershed hydrology. Yet current widely available maps inadequately depict headwater streams, underestimating channel length or omitting channels entirely. Intermittent and perennial headwater streams each provide unique habitat. Until recently, it has not been possible to accurately delineate these streams or predict channel flow durations without fieldwork. Recent advances in remote sensing may allow more accurate headwater stream mapping.

Methods for mapping intermittent and perennial headwater streams with a GIS-based modeling approach coupled with field verification were adapted, tested, and evaluated. Four models were developed …