training available upon request y the n dot photogrammetry
TRANSCRIPT
Accessing Existing Geospatial Data Training Available Upon Request By
The NCDOT Photogrammetry Unit
Extract DEM (QL2 Lidar) Tool
LiDAR
•Light Detection and Ranging
•Active sensor unlike a camera which is a
passive sensor.
•Uses thousands of laser pulses/sec to
accurately measure distances to the earth’s
surface.
•Each LIDAR pulse is a laser beam of light
that reflects back to the LIDAR sensor.
•Each reflection is called a return and there
are multiple returns collected for each
laser pulse
•An X, Y, Z coordinate can be generated for
each return
•Intensity (strength of the return) is also
collected
QL2 Elevation Model (2014 – 2017)
4 Meter Elevation Model (2001 – 2005 NC LiDar)
Vertical Accuracy Point Cloud Data Open Terrain Vertical Accuracy
- 4 Meter (2001,2003, & 2005 NC collection)
Fundamental Vertical Accuracy (FVA) 1.6 feet at a 95% confidence level
Not Suitable for Plan Sheet Mapping
- QL2 (nominal 2 points per meter
Non-Vegetated Vertical Accuracy (NVA): 0.59 feet at a 95% confidence
level
Suitable For Preliminary and Plan Sheet Mapping
Training For Extract DEM Lidar Data Tool Provided by the NCDOT Photogrammetry Unit
Contact Charles Lee
919-707-7105
NC
DO
T GIS Property Search Tool
Using A
rcMap to Create D
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County Property Files
Produced File Examples
Training For Extraction of GIS Property Data Search Tool Provided by the NCDOT
Photogrammetry Unit
Contact Charles Lee
919-707-7105
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t.gov
Statew
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Digital O
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ph
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graph
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(Febru
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18
)
