REPUBLICAN BASIN HYDROLOGIC OBSERVATORY

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REPUBLICAN BASIN HYDROLOGIC OBSERVATORY

• Digital Elevation Model (DEM)
• University of Nebraska Lincoln
• 5 December 2006
• Shannon Rose Bates
• William Sabatka

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Purpose

• Hydrologic Observatory
• Collection of data including
• Precipitation
• Stream Gauge Data
• Land Use
• Elevation
• Soil Type
• User Interface (Interactive Map)
• Assist with research and modeling

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Digital Elevation

• Importance
• Visualization
• Hillshade
• Contour
• Slope
• Evaluation
• Stream Flow
• Erosion
• Watershed Characteristics

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Data Source

• Digital Elevation Model (DEM)
• Seamless Data Distribution System, Earth
  Resources Observation and Science (EROS)
• http//seamless.usgs.gov
• 1 arc second (approximately 30x30 meter cells)

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DEM Processing

• Projected Coordinates
• NAD 1983-UTM Zone 14
• Mosaic
• Merge separate rasters into one

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Mosaic
DEM Processing
Arc Toolbox
Data Management Tools
Raster
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DEM Processing

• Projected Coordinates
• NAD 1983-UTM Zone 14
• Mosaic
• Merge separate rasters into one
• Clip
• Cookie Cutter
• Watershed Boundaries
• 8 Digit HUC

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Clip
DEM Processing
Arc Toolbox
Analysis Tools
Extract
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DEM Processing
Republican River Basin DEM
Clipped DEM with HUC boundaries shown in red
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Data Analyzing

• Spatial Analyst Tools
• Surface
• Hillshade
• Slope
• Contours

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Problems Encountered

• Size of Files
• Exceeded 2 GB Required DVDs
• Computer Processing Speed

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End Result

• Multiple Layers of Elevation Data
• Basin Boundary
• 1 Arc Second Shaded Relief Rasters
• HUC (Watershed) Boundaries
• Hillshade Rasters
• Slope Rasters
• Contour Polylines

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REPUBLICAN BASIN HYDROLOGIC OBSERVATORY
Questions

• Digital Elevation Model (DEM)
• University of Nebraska Lincoln
• 5 December 2006
• Shannon Rose Bates
• William Sabatka