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North Carolina LiDAR
2014+
Multi-phase
High Resolution
Coordination
Gary Thompson
North Carolina Geodetic Survey
March 2015 NGAC Meeting
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Original Plan
• The Plan put forward was a
5 phase 4 year plan
• Phase 1- USGS
• Phase 2- NC
• Both occurring in 2014
• Phase 3 – NC (2015)
The Plan added Onslow
County to Phase 1 with
the Coordination effort of
NRCS
Therefore moving the NC
collection Phase 2 to add
Robeson County
Acquired
Final
Processing
STATEWIDE PHASES
In
Progress
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3.5 million appropriated by the General Assembly
based on value to the state
1 million paid by NCDOT.
Phase 3 NC Collection 2015
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State Specifications
Collection
• The 2014 LiDAR data collection will meet 2
points per square meter standard with nominal
post spacing of 0.7 meters.
• All data will include multi-return and intensity
values.
• Data collected will support a 9.25 cm (3.36
inches) RMSEz and 18.13 cm FVA based on
NDEP guidelines.
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State
Specifications
• Classification
Class Description
1 Processed Unclassified
2 Ground
3 Low Veg/Strata
4 Medium Veg/Strata
5 High Veg/Strata
6 Buildings (Automated)
7 Noise (High/Low)
9 Water (Hydro Cleaned Areas)
12 Flight Line Overlap
13 Roads
14 Bridges
17 Overlap Default
18 Overlap Ground
25 Overlap Water
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LiDAR
Classification
Un-Classified Data
Ground/Bare Earth
Vegetation
Buildings
Roads/Impervious
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State Specifications Validation Range
This project has set up an Validation Range
▫ Flown by each sensor to check horizontal and vertical Accuracy of the collection.
▫ Gives the teams the capability of adjusting the sensors to match on another
▫ USGS contractors utilized the validation range
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3 Meter Elevation Model (2003 NC LiDAR)
3 Meter Point Spacing
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QL2 Elevation Model
0.3 Meter Point Spacing
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QL2 Elevation Model
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Actual Survey Elevations
4 Meter LiDAR (2003) *A more defined surface. Lacks true channel topographic
definition.
5 ½ Foot Vertical Error in
Stream Bed Elevation
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Actual Survey Elevations
NC QL2 LiDAR (2014)
*Nearly mirrors existing high precision survey data.
QL2 Profile
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Actual Survey Elevations
NC QL2 LiDAR (2014)
*Nearly mirrors existing high precision survey data.
QL2 Profile
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Summary
LIDAR Quality Ground Points
in 5 Acre
Parcel
30m NED 32
10m NED 300
3m (circa 2003)
7,696
QL2
76,957
*QL2 is a 1,000% increase in analysis
points
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RGB Composite LiDAR
3D Fly through
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Road Profile Comparisons
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Road Profile Comparisons
Distance and Elevations in Feet
-Existing NC LiDAR TIN and Road
Profile
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Road Profile Comparisons
Distance and Elevations in Feet
-New QL2 NC LiDAR from 2014
-Much higher definition in road
shape and extent
-Provides highly accurate dense
data for preliminary designs
-Roads and Bridges are classified
in LiDAR
-Create Roadway Ribbons
-Develop 3D road centerlines for
analysis
-Aids in Edge of Pavement
Detection
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Building Footprint
Extraction and Updates
• Buildings are classified within the LiDAR point cloud
• Algorithm looks for planar surfaces with steep
edges
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What do you see????
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What do you see????
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What do you see????
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Neighborhood profile
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Vehicles
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Cloverleaf
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Bridge Deck
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Utility Profile
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Looking to beat 0.328’
Looking to beat 0.643’
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Looking to beat 0.965’
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Clip and ship?
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