Vis Nir Spectroscopy Coupled With Machinelearning Algorithms To Predict Soil Gypsum In Calcareous Soils , Southern Iran Intercontinental Geoinformation Days On day 332 of the year 2022 which happened to be a Monday in the month of November Vis-NIR spectroscopy coupled with #MachineLearning algorithms to predict soil gypsum in calcareous soils , southern Iran Intercontinental Geoinformation Days