Photogrammetry & Remote Sensing

3-D Terrestrial Laser Scanning

WSDOT GeoMetrix Office 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 GeoMetrix Office 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.

 

 

 

 

 

 

 

 

 

 

 

Data (Point Clouds) From The Terrestrial Laser Scanner

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Downtown Seattle Point Cloud

 

Mannette Bridge Point Cloud

3DTL Video 2min 11 sec

   
   

 

     

 

Express Lane Tunnel under Interstate 5 Point Cloud

 

Nile Valley Slide, State Route 410 Airborne LiDAR

 

Map Products Created From Point Cloud Data

 

CAD Design File

 

Orthophoto With CAD design file overlay (the I-5 express lane tunnel mapping can be seen in this view)

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Vital Roadway Measurements

 

SR 99 Tunnel low Clearance Measurements

 

SR 99 AWV low clearance measurements

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Measurement on SR 90 Latah Bridge

 

New way of mapping by reducing "noise" in pointclouds increases accuracy (Side View of Latah Bridge)

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Substructure of lower deck on the Ship Canal Bridge Express Lane. Vibrations of traffic on upper deck disallowed conventional survey.

 

Individual scans represented by colors are part of the 3DTL technology that allow accurate data scans on moving structures.

Structure Monitoring

 

Alaskan Way Viaduct (AWV) Bent 93

 

Western Building Downtown Seattle

     
 

SR520 Pontoon Prototype Wall Deformation

 

SR520 Pontoon Prototype - Measurements

 

   

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Pavement Monitoring

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Interstate 90 Latah Bridge - roadway wear & ruts shown in variegated colors.

 

Interstate 405 Thunder Creek - deformation of roadway surface shown in variegated colors.

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Archeological Sites Near Highways

 

Top view of artifacts in a "dig" site

 

Side view of artifacts in the "dig" site

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Volumetric Calculations and Angle Measurements

 
     

Arlington PIT contour file over orthophoto

 

Cross section view of volumetric calculation for cut and fill.

 

Wrap around mesh of a rock face - new software technology allows all surface meshes to be on its own plane.

 

Dip and Dip direction calculation

Data Management

 

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Point Cloud with grid data (2.6 miles long)

 

Point Cloud data with grid close up view

 

Point cloud grid from above overlayed onto orthophoto

 

WSDOT scan locations for all 3DTL projects are maintained in Transmapper with a GIS compatible layer.

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Scanned data sets can be enormous, reaching a billion points or more. WSDOT Photogrammetry uses enhanced computers and software systems to manage these massive data sets. 

Photogrammetry produces standard WSDOT CAD files that can be used on regular computers used by project designers and planners.