CONDUCTING A LiDAR PROJECT AND WHAT YOU CAN DO WITH … · 2015-12-11 · Standard LIDAR –...
Transcript of CONDUCTING A LiDAR PROJECT AND WHAT YOU CAN DO WITH … · 2015-12-11 · Standard LIDAR –...
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CONDUCTING A LiDAR PROJECT AND WHAT YOU
CAN DO WITH THE DATA
CHRIS GUY
LIDAR PRODUCTION MANAGER
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Meeting The Needs Of The Project
Choosing Appropriate System And Platform
Project Planning Methods
Processing Workflow
Resources Necessary To Meet Schedule
Applications
Advantages of LiDAR
Software
Outline
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Meeting The Needs Of The Project
Transportation
Contours
Transmission Lines
Contours
Volumes
Buildings
Feature Extraction
Vegetation
Erosion
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Deciding Accuracy and Application
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Appropriate Platform
Helicopter
Airplane
Train
Boat
Automobile
Tripod
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Choose the Correct Sensor
Large area sensor – Leica ALS70
Corridor sensor - Optech Orion
Mobile LiDAR sensor- Optech Lynx
Fixed tripod scanner
Cameras to support the LiDAR
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LiDAR Project Planning
Plan based on
Flightline distance limitations
Workable blocks of data
Delivery tiles
Baseline requirements
Control locations
Accuracy
Application
Topography
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• Day or Night
Safety considerations
• Leaf on or Leaf off
Application dependent
• Summer, Spring, Fall, or Winter
Most collects done in the spring and fall
Summer collects take place for special
applications such as forestry
Winter collects based on geographic
location
• Weather
• Smoke
LiDAR Project Planning
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Establish a Flight Plan
• Altitude
• System PRF
• Scan Angle
• Speed
• Overlap
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Standard LIDAR – Nominal 1m point spacing
15 cm RMSEz vertical accuracy
Hydro Enforced breaklines
20 foot nominal widths for rivers
1 acre lakes/ponds
General-use, Meets most needs for LiDAR-based DEM
USGS Compliant LIDAR – Nominal 1m – 2m point spacing
15 cm RMSEz Vertical Accuracy
Hydro Enforced Breaklines
100 foot nominal widths for rivers
2 acre lakes/ponds
Points removed off breaklines in separate class
1m – 3m DEM
Metadata
Processing and Vertical Assessment Reports
High Accuracy LiDAR – 0.7m or more Point spacing
9.24 cm RMSEz
Supplemental 1 foot accuracy specifications
50% overlap for very dense vegetation
Supplemental breaklines
Vertical Assessment Report provided
Requires very good calibration: Keep overlap
LiDAR Specifications
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Terrain Impacts Collection and Processing Techniques
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Swath Gap?
Possible Void Area
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Flightlines with Proposed Base Stations
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Data collection as required by client
Contour products
Sample density – 8 points per meter and higher
3-D building extraction
Clients requiring
additional classification
Water
Vegetation
Buildings
Planning Specialized LiDAR
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Review and Initiate Project
Area 7,754 square miles
Flying Height 1,500 meters
Ground Speed 160 knots
Flight Line Sidelap 50%
Pulse Repetition
Frequency 70 KHz
Scan Angle 40° (total)
Scan Rate 35 Hz
Proposed Tile Format 2000 ft x 2000 ft
Total Number of Tiles 54,064 tiles
Units US Survey Feet
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Project Work Flow
LiDAR Acquisition (field)
Control Survey (field)
Airborne or Mobile
GPS/IMU
Output LAS
Mission Calibration
Build Project
Classify LiDAR point cloud
Create Deliverables
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Flight Plan Overlay On Imagery For Estimating
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Establishing Control
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Check Point Surveys
Five Main Categories
Hard Surface
Low Grass
High Grass
Brush
Forest
What does this mean?
By region?
Point distribution?
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Verification of Point Class
Legend High Vegetation Points
Medium Vegetation Points
Bare Soil points
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GPS/GNSS Processing
• Launch GNSS Processor
• Convert Raw data files to
GPB format
• Aircraft
• Base Station
• Published Position and
Antenna Height and Type
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LiDAR Processing - Processing
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Checking Calibration Differences between bad calibration and correct calibration
Unresolved Area Resolved Area
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Checking Calibration DZ ortho from several missions
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All Points Surface Before Point Classification
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Surface After Classifying Points To Ground
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Surface From Point Cloud Classified to Ground
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Applications
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Hydro Breakline Collection Process (LiDARgrammetry)
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Additional Classification
• Smooth Water Bodies
• Vegetation - Low, Medium, High
• Buildings - Points, Footprints
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More Detailed Line work Buildings, Curbs, Oil Tanks, Road Center Lines
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Further Classification Techniques
Class Examples
-Building
-Ground
-Water
-Non Ground
-Above or Below Ground
-Transmission Lines
-Pipeline
-Rails
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DAM Management
DSM- Digital Surface Model Intensity Image
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Building and Vegetation Extraction
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3-D Buildings
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Airborne -Planemetrics
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LiDAR of Bridge at 0.3 meter collection
LiDAR of Mile High Stadium
Airborne- Security Management
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Airborne – As Built
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Airborne – Transmission Mapping
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Airborne – HCA and Risk Analysis
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Pipeline Mapping
Materials calculations – construction
Site Design
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Airborne – Change Detection
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Contour and Orthorectification Generation
Filtered Bare Earth LiDAR & LiDAR DEM
Bare earth surface model Contours draped on surface Contours
Photography draped over
LiDAR data Contours draped over
orthophotography
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Terrestrial LiDAR –Construction and Engineering
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Terrestrial LiDAR (AEC) Architecture, Engineering, Construction
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Terrestrial AEC Architecture, Engineering, Construction
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Terrestial Emergency Management
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Terrestrial -Transportation
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Terrestrial -Accident Reconstruction
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Rail Survey
Rail Survey – Image fused with LIDAR
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Terrestrial LiDAR
Levee – Picked up cracks in the pavement on the levee
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Terrestrial LiDAR
Geomorphology- Coal veins
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Terrestrial and Helicopter
Transmission
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3D models and Site design
3D Modeling
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Survey-Grade Contour and Planimetric
Data
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Advantages of LiDAR over Photogrammetry
Collection day or night
No sun angle requirements
Ground data through canopy
Measure heights of canopy
Accurate surface models in forest
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Thank You