1 / 11

Softcopy Photogrammetry

Softcopy Photogrammetry. Dr. Frank L. Scarpace Civil and Environmental Engineering Environmental Remote Sensing Center University of Wisconsin-Madison. Outline. Definition of Softcopy Photogrammetry Why is this technology used ? Determining Elevations using Softcopy Technology

diantha
Télécharger la présentation

Softcopy Photogrammetry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related