Approximate Extraction of Spiralled Horizontal Curves from Satellite Imagery
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VIEW THE REPLYPublication: Journal of Surveying Engineering
Volume 133, Issue 1
Abstract
Generating road databases from high-resolution satellite imagery is advantageous over traditional methods because of its simplicity and efficiency. Previous research has addressed the extraction of nonspiralled horizontal curves (simple, compound, and reverse curves). All curves were assumed to be circular. This paper presents an approximate method for extracting spiralled horizontal curves. A spiralled horizontal curve consists of a circular curve and a spiral curve at each end that connects the circular curve and the tangent. The spiral curve has a curvature that gradually increases from zero (at the tangent) to the curvature of the circular curve. Because of the symmetry of the spiralled horizontal curve and the semiautomatic nature of the extraction process, the search is three dimensional. Similar to the extraction of nonspiralled horizontal curves, the proposed method performs the search procedures in a smaller area than the image size and achieves faster computations. The method first extracts one side of the road, and a simple procedure for establishing the other side is then applied. The derived curve parameters (circular curve radius, deflection angle, and spiral length) represent useful inputs into a geographic information system database.
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Acknowledgments
The research performed is partially funded by Discovery Grant of the National Science and Engineering Council of Canada. The writers wish to thank Anthony Sani of Spatial Geo-link in Toronto for his support with the latest version of ERDAS Imagine. The IKONOS imagery was provided by the Greater Toronto Airports Authority.
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© 2007 ASCE.
History
Received: Oct 2, 2003
Accepted: Oct 21, 2005
Published online: Feb 1, 2007
Published in print: Feb 2007
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