Abstract
 Sunrise on the Klamath: Determining Topographic Sunrise and Sunset Track: Modeling Author(s): Nathaniel Roth, Joshua Johnson, Joshua Viers, Michael Deas, James Quinn The duration of direct solar illumination on a water course is an integral component of hydrologic temperature modeling in topographically varied regions. Researchers at the University of California, Davis, developed an ArcMap macro using ArcObjects and VBA to estimate the duration of direct illumination and sunrise/sunset, as determined by the surrounding topography for the lower Klamath River in Oregon and California. The model is based on sequential raster hillshading, in Esri ArcGIS 9 Spatial Analyst, with computed shadows driven by an adaptation of NOAA's solar calculator. The time and spatial resolution can be modified to meet user needs and processing capabilities. Required inputs to the model are a DEM, sample points, the date for the model run, and latitude/longitude coordinates for the site of interest. The output is a geodatabase table containing the sample point IDs, sunrise and sunset times, and the duration of direct illumination. Nathaniel Roth UC Davis Information Center for the Environment 1 Shields Ave Davis, , CA 95616 US Phone: 530-752-1331 E-mail: neroth@ucdavis.edu Joshua Johnson UC Davis Information Center for the Environment 1 Shields Ave Davis, , CA 95616 US Phone: 530-754-5933 E-mail: jhjohnson@ucdavis.edu Joshua Viers UC Davis Information Center for the Environment 1 Shields Ave Davis, , CA 95616 US Phone: 530-7546051 E-mail: jhviers@ucdavis.edu Michael Deas Watercourse Engineering, Inc. 133 D Street Suite F Davis , CA 95616 US Phone: 530-750-3072 E-mail: mike.deas@watercourseinc.com James Quinn UC Davis Information Center for the Environment 1 Shields Ave Davis, , CA 95616 US Phone: 530-752-8027 E-mail: jfquinn@ucdavis.edu |
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