Photogrammetry & Remote Sensing

Photogrammetry is the science of making very precise measurements from photographs and other types of images.  Washington State Department of Transportation, (WSDOT), Photogrammetry uses these techniques to make very accurate maps and 3D computer images and CAD files.  This information is used as the base map or starting point in planning, designing and constructing transportation facilities of all types.  One of the techniques is the process that we use to scan and correct photographic (camera) images so that the resulting picture (orthophoto) has the same accuracy characteristics as a map.  This allows our customers to make precise measurements of distance, size, and geographic location of all objects in orthophoto, something that was not possible in the past. 

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SR 99 Alaskan Way 2009 Orthophoto

The new downtown Seattle orthophoto has been completed for 2009. The “jpg” image at left is a section of the orthophoto that shows the Seattle Space Needle and the Experience Music Project (EMP) buildings with the monorail and Broad Street near the lower right.

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SR 12 Culvert 3DTL Point Cloud

WSDOT uses 3 Dimensional Laser Scanning (3DTL) technology to map and model the ground, structures, and other features.  This 3DTL technology is especially useful for quick response to emergencies such as floods and landslides.  3DTL is fast, effective, accurate, and safe.    Click image to view larger.

3D Terrestrial Laser Scanning is one of the mapping tools in use at the WSDOT. more....

I-405 & SR-167 Interchange from the 2001 Corridor Mapping Project

3D Computer Aided Design (CAD) mapping is a basic component of WSDOT projects. The Photogrammetry branch of GeoMetrix produces 3D CAD maps using both long-established and very new methods, technologies, and tools. Click image to view larger.