Extracting contour lines from common-conditioned topographic maps.

Yang Chen Runsheng Wang Jing Qian Extracting contour lines from common-conditioned topographic maps. 1048-1057 2006 44 IEEE T. Geoscience and Remote Sensing 4 http://dx.doi.org/10.1109/TGRS.2005.861478 db/journals/tgrs/tgrs44.html#ChenWQ06