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* Surdex

Demystifying Advancements in Digital Orthophotography

by Surdex Corporation, St. Louis, MO
About Surdex Corp.

This paper was presented at the 2000 ESRI User Conference in San Diego, CA by Brian Mayfield, GIS Mapping Scientist with Surdex Corp. Thanks to Brian and Surdex Corp. for making this contribution to The GeoCommunity.
Recent market analyses indicate that more and more GIS professionals are utilizing digital orthophotography for their base mapping needs. This paper examines the latest technological advancements in digital orthophotography production. These advancements are sometimes misinterpreted, misunderstood, and sometimes alienated by the GIS community when procuring orthophotos. Ultimately these advancements provide GIS professionals with a cost-efficient orthophoto basemap solution without jeopardizing accuracy, image resolution, or overall quality. The goal of this paper is to provide the GIS data purchaser with descriptions of recent production enhancements and how they can reduce project costs while yielding an improved product quality.

Contents
  • Introduction
  • Airborne GPS Control
  • Scanning from Aerial Negatives
  • Direct Camera Orientation Measurements
  • Softcopy Photogrammetry
  • SoftCopy Aerial Triangulation
  • Softcopy Compilation
  • LiDAR
  • SUMMARY


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