期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-3/W49B
页码：131-138
出版社：Copernicus Publications
摘要：Road junctions are important components of a road network. However, they are usually not explicitly modelled in existing road extraction approaches. In this research, we model road junctions in detail as area objects and propose a methodology for their automatic extraction through the use of an existing geospatial database. Prior knowledge derived from the geospatial database is used to facilitate the extraction. We propose a new approach called GVF Ziplock snake that integrates the GVF (Gradient Vector Flow) field as an external force field into a Ziplock snake in order to delineate the junction border. Road extraction results provide fixed boundary conditions for the proposed snake. The approach was tested using Digital Mapping Camera (DMC) images of 0.1 m ground resolution taken from suburban and rural areas. Extraction results are represented in order to illustrate different steps of the method and to prove its feasibility
