lidar components - minnesota department of natural...

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