Scan Station 2


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Scan Station 2

  • Scan Station 2

  • 1 unit was acquired in 2008

  • Single-point range accuracy of ±4mm

  • Angular accuracies of ± 60 micro-radians

  • Laser beam spot size of 4mm from 0-50m range

  • Field of view: 360° x 270°.

  • Built-in camera for taking snap shots of the object and specifying scan zones

  • Cyclone software application



Wood-Frame Building Test: Before and After Scans

  • Wood-Frame Building Test: Before and After Scans

  • 4-5 scans in each conditions

  • At least 4 reference targets for each scan

  • Best resolution: 1000x1000 points

  • Scans stitched together based on the reference targets



Wood-Frame Building Test: Before and After Scans



Before and After Scans

  • Before and After Scans

  • Compare vertical slices of building before and after

  • HDS point cloud well correlates to transducer data



Before and After Scans

  • Before and After Scans

  • Compare horizontal slices of building before and after

  • HDS point cloud well correlates with transducer data



  • Several individual scans from all sides of a specimen were obtained

  • Stitched together in application supplied by the scanner manufacturer (Cyclone and Polygon)

  • 3D image of the specimen is generated



  • Longitudinal slices:

  • Scan Station 2 (slice thickness 4 mm: scan range ~ 10 m)

  • Vivid 910 (slice thickness 1 mm: scan range < 1m)



  • Transverse section:

  • Scan Station 2 (slice thickness 4 mm: scan range ~ 10 m)

  • Vivid 910 (slice thickness 1 mm: scan range < 1m)



  • Points cloud from Vivid 910 scanner:

  • Transverse sections with position transducer readings

  • Longitudinal sections with position transducer readings



More than 20 structures were scanned

  • More than 20 structures were scanned

  • For each scan position a panorama was generated



Environmental conditions on the sites

  • Environmental conditions on the sites



  • Bridge damaged during the earthquake was scanned from 2 positions



3D panoramic view of the bridge from Station 2.

  • 3D panoramic view of the bridge from Station 2.



  • The cross sections of the shear key (images #1 and 2) at it face is shown in image #3. The section taken at the middle of the shear key is shown in image 4 with zoomed view shown in image 5.



  • Registration of Asscotia Hotel and nearby intersection



  • Two horizontal sections at the 1st story of Asscotia Hotel are reduced in Matlab and overlaid on top of the building image in Google Earth



  • Clicking on balloon with Cal sign will bring interactive panoramic movie of the building and its surrounding (user can look around the shooting point and zoom into certain details)



  • Clicking on balloon with Cal sign will bring interactive image that contains links to points clouds generated by the laser scanner (TruView), so measurements of the objects can be performed



  • Points with colors based on deviation of columns from a vertical plane show residual deformation of south wall of Asscotia Hotel





  • Two horizontal sections at the 1st story of Asscotia Hotel were reduced in Matlab and overlaid on top of the building image in Google Earth showing calculated residual drifts in the columns





  • Validation of the technique in the lab conditions: digital level readings were 10.82% (top) and 11.82% (bottom)



  • Block 7 from Google Earth imagery taken on January 25, 2010



In opposite to conventional ground surveillance laser scans quantify the degree of permanent damage and its directivity

  • In opposite to conventional ground surveillance laser scans quantify the degree of permanent damage and its directivity



In opposite to conventional ground surveillance laser scans quantify the degree of permanent damage and its directivity

  • In opposite to conventional ground surveillance laser scans quantify the degree of permanent damage and its directivity



  • Overall residual drift and directivity is estimated from the difference of the top and bottom slices for Asscotia Hotel







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