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Communication Dans Un Congrès Année : 2008

3D imaging of the emissive layer

Résumé

A new and original stereo-imaging method is introduced to measure the altitude of the OH airglow layer and provide a 3D map of the altitude of the layer centroid. Near-IR photographs of the layer are taken at two sites distant of 645 km. Each photograph is processed in order to invert the perspective effect and provide a satellite-type view of the layer. When superposed, the two views present a common diamond-shaped area. Pairs of matched points that correspond to a physical emissive point in the common area are identified in calculating a normalized crosscorrelation coefficient. This method is suitable for obtaining 3D representations in the case of low-contrast objects. An observational campaign was conducted in July 2006 in Peru. The images were taken simultaneously at Cerro Cosmos (12° 09' 08.2" S, 75° 33' 49.3" W, altitude 4630 m) close to Huancayo and Cerro Verde Tellolo (16° 33' 17.6" S, 71° 39' 59.4" W, altitude 2330 m) close to Arequipa. 3D maps of the layer surface are retrieved. They are compared with pseudo-relief intensity maps of the same region. The mean altitude of the emission barycenter is located at 87.1 km on July 26 and 89.5 km on July 28. Comparable relief wavy features appear in the 3D and intensity maps.
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Dates et versions

hal-00370906 , version 1 (25-03-2009)

Identifiants

Citer

M.N. Kouahla, M. Faivre, G. Moreels, J. Clairemidi, D. Mougin-Sisini, et al.. 3D imaging of the emissive layer. 37th COSPAR Scientific Assembly, Jul 2008, Montréal (Québec), Canada. pp.82. ⟨hal-00370906⟩
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