@Article{isprs-archives-XLII-4-731-2018,
AUTHOR = {Youn, J. and Kim, D. and Kim, T. and Yoo, J. H. and Lee, B. J.},
TITLE = {DEVELOPMENT OF UAV AIR ROADS BY USING 3D GRID SYSTEM},
JOURNAL = {The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences},
VOLUME = {XLII-4},
YEAR = {2018},
PAGES = {731--735},
URL = {https://isprs-archives.copernicus.org/articles/XLII-4/731/2018/},
DOI = {10.5194/isprs-archives-XLII-4-731-2018}
}