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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Mark A. Bauer</dc:contributor>
  <dc:contributor>Mark R. Feller</dc:contributor>
  <dc:contributor>Christopher Holmquist-Johnson</dc:contributor>
  <dc:contributor>Todd Preston</dc:contributor>
  <dc:creator>Paul J. Kinzel</dc:creator>
  <dc:date>2015</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The US Geological Survey and Parallel Inc. conducted experimental flights with the Tarantula Hawk (T-Hawk) unmanned aircraft system (UAS&lt;/span&gt;&lt;small class="caps"&gt;&amp;nbsp;&lt;/small&gt;&lt;span&gt;) at the Dyer and Cottonwood Ranch properties located along reaches of the Platte River near Overton, Nebraska, in July 2013. We equipped the T-Hawk UAS&lt;/span&gt;&lt;small class="caps"&gt;&amp;nbsp;&lt;/small&gt;&lt;span&gt;platform with a consumer-grade digital camera to collect imagery of emergent sandbars in the reaches and used photogrammetric software and surveyed control points to generate orthophotographs and digital elevation models (DEMS&lt;/span&gt;&lt;small class="caps"&gt;&amp;nbsp;&lt;/small&gt;&lt;span&gt;) of the reaches. To optimize the image alignment process, we retained and/or eliminated tie points based on their relative errors and spatial resolution, whereby minimizing the total error in the project. Additionally, we collected seven transects that traversed emergent sandbars concurrently with global positioning system location data to evaluate the accuracy of the&amp;nbsp;UAS&lt;/span&gt;&lt;small class="caps"&gt;&amp;nbsp;&lt;/small&gt;&lt;span&gt;survey methodology. The root mean square errors for the elevation of emergent points along each transect across the DEMS&lt;/span&gt;&lt;small class="caps"&gt;&amp;nbsp;&lt;/small&gt;&lt;span&gt;ranged from 0.04 to 0.12 m. If adequate survey control is established, a UAS&lt;/span&gt;&lt;small class="caps"&gt;&amp;nbsp;&lt;/small&gt;&lt;span&gt;combined with photogrammetry software shows promise for accurate monitoring of emergent sandbar morphology and river management activities in short (1&amp;ndash;2 km) river reaches.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1353/gpr.2015.0018</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>University of Nebraska--Lincoln. Center for Great Plains Studies</dc:publisher>
  <dc:title>Experimental flights using a small unmanned aircraft system for mapping emergent sandbars</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>