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Proceedings Paper

Evaluation of the geometric accuracy of Ikonos imagery
Author(s): Thomas P. Ager
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Paper Abstract

NIMA has initiated a program to evaluate high resolution commercial sensors developed by Space Imaging, Digital Globe, Orbimage and others. This paper presents the results of accuracy evaluations of Ikonos orthophotos, stereo pairs and triangulation block adjustments. Ikonos image products were compared to a globally distributed set of Ground Control Points (GCPs) and the calculated geometric accuracy was found to be better than the published Ikonos specifications. This paper also describes some important matters relating to sensor geometry models and pays special attention to a replacement math model called the rational polynomial coefficient (RPC) model. These coefficients were used to model Ikonos stereo images, and a special adjustable form of the RPC rational function was used in multi-strip block adjustments. Comparisons to ground control and the rigorous Ikonos geometry model are provided.

Paper Details

Date Published: 23 September 2003
PDF: 8 pages
Proc. SPIE 5093, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery IX, (23 September 2003); doi: 10.1117/12.486952
Show Author Affiliations
Thomas P. Ager, National Imagery and Mapping Agency (United States)


Published in SPIE Proceedings Vol. 5093:
Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery IX
Sylvia S. Shen; Paul E. Lewis, Editor(s)

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