USE OF TOPOLOGY IN AUTOMATIC ROAD EXTRACTION

This paper presents a method for hypothesis verific at on in automatic road extraction based on the top ology of road networks. The method includes the generation of topology of road networks, verification of hypothesized road segment s and prediction of missing road segments. The topology of road networks is generate d using small scale aerial images as they exhibit a global structure of road networks. The hypotheses of road segments produced in medium scale images are verified using their relationships with the generated topological information of road networks. The missing road segm nts are also predicted during this process using t opological information. An aerial image with an image scale of 1:25,000 in New South Wales is tested. To generate the topology of road n etwork, the images are resampled with a reduction factor of 15. The test result s show that the topology of road network can be eff ctively used to remove spurious hypotheses and to infer the missing road segments.