Using Fish‐Eye Lens for GPS Site Reconnaissance
Publication: Journal of Surveying Engineering
Volume 115, Issue 3
Abstract
One of the problems in the use of Global Positioning System (GPS) is that of rapid site evaluation and point reconnaisance. The paper utilizes a system developed for solar easement site analysis by fish‐eye lens photography to allow rapid and accurate site evaluation by the Survey Engineer. This system allows prior analysis of satellite visibility windows, possible multipath problems and serves as a permanent site record. This analysis is accomplished by taking a vertical fish‐eye image and overlaying a computer‐produced satellite track in the form of an azimuth versus zenith angle plot. The result is an efficient determination of a site satellite window diagram giving an accurate and complete view of site conditions. This technique saves time over classic ground survey methods while producing reasonable accuracy and the fish‐eye image may be used to predict future problems with the site as vegetation sky cover changes with season and through time.
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References
1.
Berquist, H. E. (1988). “Mission planning in GPS surveying.” ASCE Surveying Engineering Specialty Conference: Engineering Applications of GPS Satellite Surveying Technology, Nashville, Tenn., May.
2.
Colcord, J. E. (1982). “Consideration of new techniques for solar energy site analysis.” Technical Papers, American Society of Photogrammetry, Denver, Colo., Mar., 342.
3.
Elgarf, T. (1981). “Use of fish‐eye lens in solar energy assessment.” ASP Technical Papers, Amer. Society of Photogrammetry, San Francisco, Calif., 448.
4.
Gough, R., Frei, E., Reiner, J., Sherrer, R. (1988). “The WM 101 and PoPS™: An investigation in the Swiss Alps.” GPS‐88, ASCE Surveying Engineering Specialty Conference.
5.
Krohn, D., Vonderhoe, A., Mezera, D. (1988). “GPS in support of LIS: Project CONSOIL, Dane County, Wisconsin.” J. Surv. Engrg., ASCE, 114(4), 172.
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Copyright © 1989 ASCE.
History
Published online: Aug 1, 1989
Published in print: Aug 1989
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