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Proceedings Paper

Atmospheric refraction: Applied image analysis and experimental example for index profile with curvature
Author(s): Daniel Short; David Voelz; Jose Barraza; Ivan Dragulin
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Paper Abstract

In this work we consider atmospheric refractive bending and its effects on long-range imaging along a horizontal path. Refraction can impact the ability of a remote sensing or image system to accurately locate objects and determine their apparent proportions. We use a low-cost commercial camera operating in a time-lapse mode for refraction studies and have been recording images of a building that is 15.3 km west of the camera. Based on the paraxial ray equation, a solution for ray height and angle is obtained for a refractive index profile with curvature. A curved index profile can produce the effects of towering (stretching) and stooping (compression). The curvature parameter for the average atmospheric index profile between the camera and target can be derived from an analysis of the images collected by the camera system. We show example images where the building (33 m height) appears to stretch by 5.1 m and calculate a refractive index curvature parameter of 6.0x10-5 m-2.

Paper Details

Date Published: 13 May 2016
PDF: 8 pages
Proc. SPIE 9833, Atmospheric Propagation XIII, 98330D (13 May 2016); doi: 10.1117/12.2224294
Show Author Affiliations
Daniel Short, New Mexico State Univ. (United States)
David Voelz, New Mexico State Univ. (United States)
Jose Barraza, New Mexico State Univ. (United States)
Ivan Dragulin, New Mexico State Univ. (United States)


Published in SPIE Proceedings Vol. 9833:
Atmospheric Propagation XIII
Linda M. Thomas; Earl J. Spillar, Editor(s)

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