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Radiometric And Geometric Analysis Of Hyperspectral Imagery Acquired From An Unmanned Aerial Vehicle, Ryan Hruska, Jessica Mitchell, Matthew Anderson, Nancy F. Glenn
Radiometric And Geometric Analysis Of Hyperspectral Imagery Acquired From An Unmanned Aerial Vehicle, Ryan Hruska, Jessica Mitchell, Matthew Anderson, Nancy F. Glenn
Nancy Glenn
In the summer of 2010, an Unmanned Aerial Vehicle (UAV) hyperspectral calibration and characterization experiment of the Resonon PIKA II imaging spectrometer was conducted at the US Department of Energy’s Idaho National Laboratory (INL) UAV Research Park. The purpose of the experiment was to validate the radiometric calibration of the spectrometer and determine the georegistration accuracy achievable from the on-board global positioning system (GPS) and inertial navigation sensors (INS) under operational conditions. In order for low-cost hyperspectral systems to compete with larger systems flown on manned aircraft, they must be able to collect data suitable for quantitative scientific analysis. The …
Dust Supply Varies With Sagebrush Microsites And Time Since Burning In Experimental Erosion Events, Joel B. Sankey, Matthew J. Germino, Nancy F. Glenn
Dust Supply Varies With Sagebrush Microsites And Time Since Burning In Experimental Erosion Events, Joel B. Sankey, Matthew J. Germino, Nancy F. Glenn
Nancy Glenn
[1] Wind erosion and large dust plumes are an increasingly important attribute in cold-desert rangelands, particularly as wildfire increases. Fire reduces vegetation, which increases erosivity. Whether sediment supply increases after fire has not been determined in this environment. We asked how sediment supply varied among sites burned 2-months to 5-years previously, in comparison to unburned sagebrush steppe, across 500 km of southern Idaho, USA. We measured potential dust emissions (PM10, particles <10μm diameter) in response to step changes in friction velocity (u*), with a field-based wind tunnel analog (PI-SWERL, Portable In Situ Wind Erosion Laboratory). We evaluated how emissions, sediment supply, and a proxy of erodibility varied among the microsite soil patterning in these sites (shrub islands and interspaces). Emissions were three orders of magnitude greater on burned compared to unburned surfaces, especially where shrubs had existed and sites burned more recently. Greater emission rates were due to greater sediment supply, whereas the proxy of erodibility did not vary among the surfaces for dry conditions that prevail during large wind erosion events (near −150 MPa at the surface). Wetter surface conditions, similar to those after precipitation or snowmelt, resulted in less dust emission on a recently burned site. Dust supply increases in initial postfire years especially on microsites that previously had shrubs. Abundance of shrubs is responsive to management practices that affect prefire vegetation, and grazing-induced increases in shrubs might, for example, render a site more vulnerable to dust emissions following fire.
A Comparison Of Two Open Source Lidar Surface Classification Algorithms, Wade T. Tinkham, Hongyu Huang, Alistair M.S. Smith, Rupesh Shrestha, Michael J. Falkowski, Andrew T. Hudak, Timothy E. Link, Nancy F. Glenn, Danny G. Marks
A Comparison Of Two Open Source Lidar Surface Classification Algorithms, Wade T. Tinkham, Hongyu Huang, Alistair M.S. Smith, Rupesh Shrestha, Michael J. Falkowski, Andrew T. Hudak, Timothy E. Link, Nancy F. Glenn, Danny G. Marks
Nancy Glenn
With the progression of LiDAR (Light Detection and Ranging) towards a mainstream resource management tool, it has become necessary to understand how best to process and analyze the data. While most ground surface identification algorithms remain proprietary and have high purchase costs; a few are openly available, free to use, and are supported by published results. Two of the latter are the multiscale curvature classification and the Boise Center Aerospace Laboratory LiDAR (BCAL) algorithms. This study investigated the accuracy of these two algorithms (and a combination of the two) to create a digital terrain model from a raw LiDAR point …
Aeolian Nutrient Fluxes Following Wildfire In Sagebrush Steppe: Implications For Soil Carbon Storage, N. J. Hasselquist, M. J. Germino, J. B. Sankey, L. J. Ingram, N. F. Glenn
Aeolian Nutrient Fluxes Following Wildfire In Sagebrush Steppe: Implications For Soil Carbon Storage, N. J. Hasselquist, M. J. Germino, J. B. Sankey, L. J. Ingram, N. F. Glenn
Nancy Glenn
Pulses of aeolian transport following fire can profoundly affect the biogeochemical cycling of nutrients in semi-arid and arid ecosystems. Our objective was to determine horizontal nutrient fluxes occurring in the saltation zone during an episodic pulse of aeolian transport that occurred following a wildfire in a semi-arid sagebrush steppe ecosystem in southern Idaho, USA. We also examined how temporal trends in nutrient fluxes were affected by changes in particle sizes of eroded mass as well as nutrient concentrations associated with different particle size classes. In the burned area, total carbon (C) and nitrogen (N) fluxes were as high as 235 …
Landslide Surveillance: New Tools For An Old Problem, J. Chadwick, G. Thackray, S. Dorsch, N. Glenn
Landslide Surveillance: New Tools For An Old Problem, J. Chadwick, G. Thackray, S. Dorsch, N. Glenn
Nancy Glenn
Landslides are one of the most widespread geological hazards on Earth, responsible for hundreds of deaths and billions of dollars in property damage per year. Landslides commonly occur with other natural disasters (e.g., earthquakes, floods) and leave the landscape prone to sedimentation, erosion, and further mass wasting.