@Article{isprs-archives-XLIX-B3-2026-325-2026,
AUTHOR = {Zhan, Y.-X. and Zhang, Y.-J. and Wei, C.-H. and Chen, J.-C.},
TITLE = {Using NGRDI index to assist in forest canopy gaps classification of UAV RGB imagery},
JOURNAL = {The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences},
VOLUME = {XLIX-B3-2026},
YEAR = {2026},
PAGES = {325--331},
URL = {https://isprs-archives.copernicus.org/articles/XLIX-B3-2026/325/2026/},
DOI = {10.5194/isprs-archives-XLIX-B3-2026-325-2026}
}