Utilizing Spectral Indices on UAV Multispectral Images for Paddy Healthiness Detection: A Case Study in Perlis, MalaysiaNor Hafiza Aziz, Rohayu Haron Narashid, Tajul Rosli Razak, Siti Aminah Anshah, Noorfatekah Talib, KhairulAzhar Zainuddin, Zulkiflee Latif and Norhashila HashimE3S Web Conf., 557 (2024) 03005DOI: https://doi.org/10.1051/e3sconf/202455703005