training available upon request y the n dot photogrammetry

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

cglee@ncdot.gov

NC

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Training For Extraction of GIS Property Data Search Tool Provided by the NCDOT

Photogrammetry Unit

Contact Charles Lee

919-707-7105

cglee@ncdot.gov

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