Geographic Services Office

text size: T T T

Photogrammetry

Geographic Services

Most Requested

2007 Winter Flood Emergency Mapping

Geo Crews Fast Response Time
We Got The Mapping Done In Record Time To Get Motorists Moving Again!

2007 Chehalis Flood Waters Over I-5
 

Geographic Services provided assistance with documentation and recovery efforts by using photography, scanning and mapping of damaged areas. One of the services offered was ground based laser scanning, (3DTL), to safely collect data of the slides and flood damaged areas. Jump To Pictures

 

Geographic Services Response Timeline
 
- December 3rd, Washington State Rain Storm Impacts the West Coast
- December 4 - Aerial Photography collects 100+ oblique photos from helicopter
- December 6th, Mapping Request for 3DTL (3D Terrestrial Laser Scan) recede and   Geodetic Survey lays control to support high accuracy GPS flight
- December 7th, Photogrammetry & Remote Sensing provides Aerial Photography with   flight map planning. flight crew grounded by weather
- December 8th, Aerial Photography mobilized and flying slide areas
- December 11th, Geodetic Survey 3DTL crew on site scanning and collecting data
- December 12th, Photogrammetry & Remote Sensing unit Point Cloud processing begins.   Received scanned data at 11:30 am and delivered basemap at 5:30 pm
- December 13th, Photogrammetry & Remote Sensing unit was asked to provide   additional mapping in the morning. The Geodetic Survey crew came back with additional   topographic data at 3:45 pm and Photogrammetry & Remote Sensing delivered the   additional mapping products (basemap, contour file, and digital terrain model) by 5:30   pm
- December 19th, Photogrammetry & Remote Sensing completes the .25 foot resolution   orthophoto of the SR 6 Slide.
- December 28th - Photogrammetry & Remote Sensing delivered and published the I-5   Chehalis Flood 2007 orthophoto mosaic.

See the Aerial Photographs of the actual flood.

Aerial Photography December 8th

This aerial view of the SR 6 provides the big picture of the damage at mile post 27. You can see how the slide split in two directions around a rock outcrop covering the state route, impacting residents, and blocking travel.

Click images for larger view.

 

These pictures show the 3DTL Survey crew setting up the scanner amidst the excavation workers on the slide area.

This is the close-up from the top of the slope at left.

Scanner on the R 6, mud is covering the state route. Click to see larger image.

Scan of the slope in the slide area. Click to see larger image.

3D Terrestrial Laser Scanning Crew, Jeff Shields and Jay McDermott are shown here with (from left to right), GPS unit, 3D Scanner, Scanner Target. For more information on this new technology see our 3DTL page.
 

Photogrammetry & Remote Sensing Mapping

This shows a point cloud (scanned data) of the SR 6 slide cross section showing the excavation tractor on the slope.

This shows the contour file created from the Point Cloud data ~ the excavation tractor on the slope is visible here too.

This shows the Point Cloud data for the entire slide area. The black dot in the center of the image is where the scanner is sitting.

This is the contour file created from the Point Cloud data.

This shows the accuracy of the contour lines overlaid on the point cloud.

This is a cropped portion of the .5 foot resolution orthophoto completed at 3:00 PM, December 19th.

This shows the Point Cloud data cross section of a section of the SR 6 Slide.

This shows the blue contour map accuracy over the slope point cloud data cross section of the entire SR 6 Slide.
Copyright WSDOT © 2007