Hyperspectral Image Data and Waveband Indexing Methods to Estimate Nutrient Concentration on Lettuce (Lactuca sativa L.) Cultivars. - Sulaymon L. Eshkabilov; John Stenger; Elizabeth N. Knutson; Erdem Küçüktopcu; Halis Simsek; Chiwon W. Lee (Sensors, 2022)