James W. Merchant

Learn More
The Thematic Mapper (TM) instruments onboard Landsats 4 and 5 provide high-quality imagery appropriate for many different applications, including land cover mapping, landscape ecology, and change detection. Precise calibration was considered to be critical to the success of the Landsat 7 mission and, thus, issues of calibration were given high priority(More)
OBJECTIVE To explore issues related to the aging workforce, including barriers to integrating health protection and promotion programs, and provide recommendations for best practices to maximize contributions by aging workers. METHODS Workgroups reviewed literature and case studies to develop consensus statements and recommendations for a national(More)
Modeling groundwater vulnerability to pollution is critical for implementing programs to protect groundwater quality. Most groundwater vulnerability modeling has been based on current hydrogeology and land use conditions. However, groundwater vulnerability is strongly dependent on factors such as depth-to-water, recharge and land use conditions that may(More)
Although the consequences of the homogenization of Earth’s flora and fauna are not well understood, experts agree that biological invasions pose hazards to rare species. As a result, there is a need for a systematic approach to assess risks from invasive species. The Relative Risk Model can be adapted to assess combinations of rare species, invasive(More)
Invasive plants continue to spread in riparian ecosystems, causing both ecological and economic damage. This research investigated the impacts of common reed, purple loosestrife, riparian shrubland, and riparian woodlands on the quality and quantity of sandhill crane roosting habitat in the central Platte River, Nebraska, using a discrete choice model. A(More)
In recent years, elk have begun recolonizing areas east of the Rocky Mountains that are largely agro-forested ecosystems composed of privately owned land where management of elk is an increasing concern due to crop and forage depredation and interspecific disease transmission. We used a Geographic Information System, elk use locations (n = 5013), random(More)
.............................................................................................................. ii ACKNOWLEDGEMENTS ...................................................................................... iv LIST OF T ABLES ................................................................................................. viii LIST OF FIGURES(More)
Invasive species often threaten native wildlife populations and strain the budgets of agencies charged with wildlife management. We demonstrate the potential of cost-effectiveness analysis to improve the efficiency and value of efforts to enhance sandhill crane (Grus canadensis) roosting habitat. We focus on the central Platte River in Nebraska (USA), a(More)
The costs of healthcare have long been a concern in the United States. It is well known that these costs vary geographically, but attempts to explain this variation have been met with limited and varied success. This is partly attributable to the fact that data available have restricted analyses to assessing the issue to using Medicare cost per beneficiary.(More)