Photogrammetry & Remote Sensing

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3-D Terrestrial Laser Scanning
 

WSDOT Geographic Services uses 3-D Terrestrial Laser Scanning technology to produce very accurate, very dense 3-dimensional digital data sets (called "point clouds") used for CAD mapping. This 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. The WSDOT Geographic Services Photogrammetry & Remote Sensing Branch and Geodetic Survey Branch are highly skilled and experienced in this advanced technology. The Geodetic Survey crew scans the project while the Photogrammetry staff processes the data to the final 3D CAD deliverables.

Some Benefits of 3-D Terrestrial Laser Scanning Technology

 

- 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 CAD 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 digital 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

 

3-D Scanning NEWS

Data From the Scanner

 

Emergency Mapping Solutions
Poly lines and Objects Over Point Clouds

 

Unstable Slopes Mapping PDF

Data In CAD software

 

Deliverable Product Format

 

Data (Point Clouds) From The Terrestrial Laser Scanner

Click images for larger view

Downtown Seattle

Seattle bridge over I-5 including express lane tunnel

3DTL Video 2min 11 sec
3DTL Video 48 sec

Convention Center Fence
Bridge Point clouds illustrating As-Built  conditions accurately and in detail.

Bridge Cross Section216th Ave SW over I-5 north of Chehalis

Jersey Barrier 3DTL Video 45 sec
 

   I-5 near Seattle Convention Center

 Mellen Street Bridge In Chehalis

Exit Ramp Under Pike Street In Seattle - Red Lines are CAD vectors derived from point clouds

All points have accurate XYZ coordinates

Bridge cross section measurement is from curb to curb

Measurement of Bridge Clearance


 

Intersection of I-5 And SR 520 in Seattle

Side View of Intersections of I-5 and SR 520

 

 

Data In MicroStation Format

CAD Drawing

CAD drawing overlaid on High Resolution Orthophoto

Digital Terrain Model with Bridges Surfaces

Digital Terrain Model with bridges surfaces and structures outlines

 

Countour File

Point Cloud Showing Tree Measurement