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Abstract
A detailed assessment of the planimetric accuracy of high-resolution panchromatic Ikonos orthoimage products for three different test sites is presented. The main objective was to evaluate the potential of Ikonos orthoimage products for use as digital image basemaps in local government Geographic Information Systems (GIS) systems. For maximum utility and adoption, a planimetric accuracy of 3–5 m and a circular error at 90% probability (CE90) is considered nominal for local government planning and management applications. Low-precision, low-cost georeferenced Ikonos image products (Geo, 50 m CE90) were orthorectified using third party commercially available software and various custom Digital Elevation Models (DEMs). The planimetric accuracies of the resulting custom Ikonos orthoimages were found to vary between 2–4 m CE90. In addition, United States Geological Survey (USGS) DEMs were also used to orthorectify georeferenced Ikonos image products. Planimetric accuracies of 2–3 m CE90 were obtained from georeferenced Ikonos using USGS DEMs with RMS vertical accuracies of the order of 2 m. The approach demonstrated here can be used to deliver up-to-date, cost-effective orthoimages from Ikonos Geo products that yield planimetric accuracies suitable for use as digital image basemaps by local governments.
Acknowledgments
The SBC work was supported by the Raytheon Synergy program under subcontract No. 012100MJ-3 from NASA. The SCC and UVS work was supported by NASA Stennis Space Center under contract No. NAG13-99014 and by the Interdisciplinary Center for Research in Earth Science Technology (ICREST) at the University of Missouri—Columbia. The authors would like to thank T. Toutin and P. Cheng for useful discussions and the anonymous reviewers for suggestions that improved the manuscript.