@article{a6af2c4060074355a1b280e9c38544c5,
title = "Models of Urban Areas for Line-of-Sight Analyses",
author = "Franz Leberl and Wolfgang Walcher and R. Wilson and Michael Gruber",
note = "Automatic Extraction of GIS Objects from Digital Imagery, International Society for Photogrammetry and Remote Sensing [ISPRS], Munich, Germany, 6-10 September",
year = "1999",
language = "English",
volume = "32",
pages = "217--226",
journal = "International archives of photogrammetry and remote sensing = Archives internationales de photogramm{\'e}trie et de t{\'e}l{\'e}d{\'e}tection = Internationales Archiv der Photogrammetrie und Fernerkundung",
issn = "0256-1840",
number = "3",
}