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Softcopy Photogrammetry: Automation for Efficient Elevation Measurement

Explore the advancement of Softcopy Photogrammetry technology by Dr. Frank L. Scarpace, showcasing its benefits, automation features, and potential for elevation measurement. Discover the innovative digital approach replacing traditional methods. Witness automated terrain measurement in action.

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Softcopy Photogrammetry: Automation for Efficient Elevation Measurement

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  1. Softcopy Photogrammetry Dr. Frank L. Scarpace Civil and Environmental Engineering Environmental Remote Sensing Center University of Wisconsin-Madison F.L.Scarpace

  2. Outline • Definition of Softcopy Photogrammetry • Why is this technology used ? • Determining Elevations using Softcopy Technology • Automatic Terrain Measurement • Demonstration of the technology F.L.Scarpace

  3. Softcopy Photogrammetry • Also known as Digital Photogrammetry • Mathematics is the same as in traditional Photogrammetric technology. • The images (diapositives) are replaced by scanned aerial images. • Measurements and image viewing are on a computer screen instead of through high quality optics. F.L.Scarpace

  4. Why Softcopy? • The principal reason this technology has been adapted is the potential for almost complete automation of the Aerial Triangulation process. • Aerial Triangulation is the least expensive method of determining the orientation of images within a block of aerial photos. F.L.Scarpace

  5. (ASPRS, 1980) Softcopy Photogrammetry Orientation 6 Parameters define the orientation for an aerial image at the time of exposure. The location of the image: Xc,Yc, and Zc And the pointing direction: , , and  F.L.Scarpace

  6. Measurement of Elevation • Once the Orientations for a stereo pair of digital images are known, the elevation for a point in the overlap area can be determined. • This is usually accomplished by viewing the images on the computer monitor in 3-D and clicking on the appropriate location. F.L.Scarpace

  7. Measurement of Elevation F.L.Scarpace

  8. Automatic Terrain Measurement • Almost all elevations within Softcopy systems used in production are determined manually by an experienced operator. • Potentially this process can be automated, saving both time and money. • The ATM technology uses area matching techniques to find corresponding points within a stereo pair. F.L.Scarpace

  9. Automatic Terrain Measurement * Many more elevation points can be found using this technique compared to manual methods. * The number of points are comparable to those measured with LIDAR. * Currently, the Automatic Terrain Measurement technology generates too many errors to make it practical. F.L.Scarpace

  10. SEARCH EXAMPLE Left Image Right Image Search Window Pull-In Region Reference Window Search Direction Search Image Reference Image Automatic Terrain Measurement F.L.Scarpace

  11. Demonstration of ATM F.L.Scarpace

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