Minmax normalization was performed on geo-referenced images before adding them to the network. Normalization is a step of data pre-processing which is required in the field of data mining. This method helps to scale the values to fall within same specific ranges and may contribute to enhancing the accuracy of the machine learning algorithms like, artificial neural networks and clustering classifiers [43]. In our study, normalization helps to remove different range of of spectral reflectance values present in images.