lidar components - minnesota department of natural...
TRANSCRIPT
LiDAR Components
Light Detection and Ranging Laser Rangefinder
IMU (INS)
GPS
On board computer
Produces accurate land elevation data
1/4/2013 Slide courtesy of USGS
LiDAR Basics
GPS
Global Positioning System
Differentially corrected
Provides cm accuracy of aircraft
Allows cm accuracy of laser pulse
1/4/2013 Slide courtesy of USGS
LiDAR Basics
On-board Computer
Records data
Laser distance and intensity
Inertial Measurement Unit (IMU) info
GPS info
Converts into X, Y, Z
Millions of points
On-board display
1/4/2013 LiDAR Basics Slide courtesy of USGS
Scanning Lidar
1/4/2013
Courtesy of Dodson & Associates
LiDAR Basics
Returns
Single Return
Multiple returns
Waveform Returns
1/4/2013 Slide courtesy of USGS
LiDAR Basics
Returns
Single Return
Multiple returns
Waveform Returns
1/4/2013
1st return
2nd return
3rd return
4th return
Slide courtesy of USGS LiDAR Basics
1/4/2013
Returns
Single Return
Multiple returns
Waveform Returns
Slide courtesy of USGS LiDAR Basics
Potential LiDAR Applications
Water Resources Floodplain mapping
Storm water management
Drainage basin delineation
Shoreline erosion
Geology Sinkhole identification
Geologic/geomorphic mapping
Transportation Road and culvert design
Cut and fill estimation
Archaeological site identification
Agriculture Erosion control structure design
Soils mapping
Precision farming
1/4/2013
Water Quality Watershed modeling
Wetland reconstruction
Land cover/land use mapping
Forestry Forest characterization
Fire fuel mapping
Fish and Wildlife Management Drainage and water control
Walk-in Accessibility
Habitat Management
Emergency Management Debris removal
Hazard Mitigation
LiDAR Basics
1/4/2013
Lidar Applications
Structural
Analyses
Vegetative
Analyses
Bare Earth
Analyses
Vendor Data
Slide courtesy of USGS LiDAR Basics
1/4/2013
Bare Earth Analysis
•Buildings and Trees removed
•Automatic and Manual filtering
•Shows bare earth surface
Slide courtesy of USGS LiDAR Basics
Top: Digital Surface Model (DSM) Bottom: Digital Elevation Model (DEM)
1/4/2013 Slide courtesy of USGS
LiDAR Basics
Contours – Initial Bare Earth Surface
1/4/2013 Slide courtesy of Sanborn
LiDAR Basics
Contours - Filtered Bare Earth Surface
(After Automated & Manual Processing)
1/4/2013 Slide courtesy of Sanborn
LiDAR Basics