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3-D Terrestrial Laser Scanner

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3-D Terrestrial Laser Scanning

WSDOT Geographic Services offers3-D Terrestrial Laser Scanning. Terrestrial Laser produces a very accurate, very dense 3-dimensional digital data set (sometimes called a "point cloud") used for CAD mapping. This relatively new surveying technology is a fast, safe, and efficient way to model and measure many areas where it can provide advantages over traditional survey or photogrammetric methods. WSDOT Geographic Services has a well skilled team to deliver mapping products for WSDOT projects.

Terrestrial Laser Scanning Benefits
•	Greater safety for motorists and survey crews by working away from the traffic
•	Decreased traffic disruption by collecting data from a safe distance
•	Reduce the time collecting field data by 20-30% compared to conventional survey
•	Reduce or eliminate return visits to the site
•	Expand data collection to difficult areas such as slopes, tunnels, high buildings and structures.
•	Enhance projects by combining photogrammetry CADD and Terrestrial Laser Scanning
•	Georeference data (point clouds) using Global Position System (GPS)
•	3 dimensional virtual surveying
•	Effective scanning range is 220 feet in all directions for roadway surfaces and greater for vertical distances.
•	Integrated high-resolution digitial camera provides coverage of scanned scenes.
•	Deliverable design file compatible with WSDOT design software and procedures.
•	Point Clouds can be overlaid in the design file to facilitate interpretation.
Note: Terrestrial Laser Scanning is not a replacement for Survey and Photogrammetry. It is an additional tool to enhance the mapping process.

Look Through The Processes & Products		Short Videos of 3D Projects
Data From the Scanner		Downtown Seattle Convention Center approx. 1 min 47 sec
Polylines and Objects Over Point Clouds		3D Bridge Cross Section Detail approx 1 min 48 sec
Data Ready for Export		3D Bridge Overview approx. 50 sec
Deliverable Product Format		3D Jersey Barrier approx. 44 sec
Presentations & Papers
Northwest Region Design Conference 2008
What Is 3DTL Presentation Paper PDF What Is 3DTL? PDF from Power Point I-90 Project 2007 PDF		During the Design Conference Demonstration, the 3DTL crew from Geodetic Survey and Photogrammetry & Remote Sensing used the scanner to scan the audience.
I-90 Video - this video was created by Design Visualization with DTM (data terrain model) from Photogrammetry.		Below are images of the Point Clouds of the audience. Click the Point Cloud pictures to see a larger view.

		The Scanner Laser does not cause any harm. Here is the 3DTL Specialist that creates the maps from the Point Clouds. Click on the Pictures to see a larger view.

Data (Point Clouds) From The Terrestrial Laser Scanner
Click images for larger view. Videos should be played in Media Player v9 or above.


Downtown Seattle Point Cloud		Seattle bridge over I-5 including express lane tunnel.
Click Here to Play Downtown Seattle Video		Click Here to Play 3-D Bridge Overview Video


Convention Center Fence ~ Point clouds illustrating As-Built conditions accurately and in detail.		Bridge Cross Section 216th Ave SW over I-5 north of Chehalis
Click Here to Play 3D Jersey Barrier Video		Click Here to Play 3-D Bridge Cross Section Video


I-5 near the Seattle Convention Center		Mellen Street Bridge In Chehalis

Polylines And Objects Over Point Clouds


Exit Ramp Under Pike Street In Seattle ~ Red lines are CADD vectors derived from point clouds.		All points have accurate XYZ coordinates.


Bridge cross section ~ measurement from curb to curb.		Measurement of bridge clearance.
		3 D Bridge Overview Video

Vector Data Before Export To Design Software


Intersection Of I-5 And SR 520 In Seattle		Side View Of Intersections of I-5 And SR 520 in Seattle

Data in MicroStation Format



CADD File		CADD File Over A High Resolution Orthophoto


Digital Terrain Model with bridges surfaces using InRoads 2004		Digital Terrain Model with bridges surfaces and structures outlines using InRoads 2004.