Save Time on Surveying

The state of Ohio recently replaced its decade-old aerial photos with high-resolution digital color imagery. This article describes how Ohio used Light Detection Imaging and Ranging (LiDAR) to collect elevation data via aircraft-mounted laser equipment in order to create digital elevation models to support orthorectification of the new imagery. Every square mile of the state was flown to capture consistent, seamless imagery. The new aerial images were draped over the DEMs to orthorectify the imagery so the scale is uniform and in effect becomes a map able to measure true distances. The resulting data set consists of digital aerial imagery/LiDAR points, color digital orthophotography, color infrared digital orthophotography, and a LiDAR DEM. The imagery can be shown in 3-D and offers multiple views simply by rotating the images. Because the DEM data accurately maps the shape of landed surfaces in 3-D, it can be used for many engineering purposes. The Ohio Department of Transportation is using the imagery and LiDAR data for planning roads, bridges and drainage projects.


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos;
  • Pagination: pp 34-36, 38, 40-43
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01105203
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 26 2008 10:27AM