Discussion of topographic data in the lower Yolo Bypass

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Discussion of topographic data in the lower Yolo
Bypass
Joel Dudas, Delta-Suisun Marsh Office
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Data Sources

• USGS National Elevation Dataset
• 2005 LiDAR
• 2007 LiDAR
• Comp Study data
• Individual site surveys

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LIDAR
Uses GPS and inertial measurement unit (IMU)
to accurately position the plane and map the
surface
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Before
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Afr
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9/2005 LiDAR Acquisition
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2005 Flight LiDAR

• Acquired 9/2005
• Covers entire Yolo Bypass Suisun Marsh
• Horizontal Spacing
• scan returns 1.7 meter
• grid 2 meters
• Vertical Accuracy ? (1.1 ft 2.0 ft)
• Status
• Data complete
• Documentation pending

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2007 Flight LiDAR

• Acquired 2/2007 (9 reflown 3/2008)
• Covers almost entire legal Delta Suisun Marsh
• Horizontal Spacing
• scan returns .88 meter
• grid 1 meter
• Vertical Accuracy lt .5 foot
• Status
• Data currently in review/revision of reflown data
• Documentation pending

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Liberty
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Liberty
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Cross Section 1 Raw Data
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Cross Section 1 Bare Earth
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Liberty
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Cross Section 2 Raw Data
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Cross Section 2 Bare Earth
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Cross Section 2 Bare Earth
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Prospect
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Selected Land Cover reported accuracies, south
Bypass

• Land Cover Accuracy, cm
• Mixed Vegetated Levee 15.68
• Orchard or Corn 17.93
• Row Crop (Alfalfa) 18.42
• Levee Rip Rap 20.97
• Freshwater Marsh 25.28
• Mixed Age Forest 34.88

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Contours
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Breaklines
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Other data

• DWR site surveys, various
• 2005 Deepwater Ship Channel survey
• 1997-8 Comprehensive Study survey

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DEM production
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Questions?

• Joel Dudas
• jdudas_at_water.ca.gov
• 916-651-7002