Demystifying Advancements in Digital Orthophotography
by Surdex Corporation, St. Louis, MO
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.
About Surdex Corp.
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.
- Airborne GPS Control
- Scanning from Aerial Negatives
- Direct Camera Orientation Measurements
- Softcopy Photogrammetry
- SoftCopy Aerial Triangulation
- Softcopy Compilation