1. A method of assessing a harvest of sun drying crops, comprising: capturing a multispectral satellite or an aerial image of a coffee estate sun-drying beans including areas where coffee is sun-dried; defining a geospatial region of interest within the image; calculating a Normalized Difference Vegetation Index and a Normalized Difference Water Index for each pixel within the geospatial region of interest; testing each pixel within the geospatial region of interest for a reflectance value matching at least one spectral signature including washed or unwashed coffee dries; classifying each pixel within the geospatial region of interest based on the spectral signature and the calculated Normalized Difference Vegetation Index and the Normalized Difference Water Index; comparing temporal changes of the Normalized Difference Vegetation Index and the Normalized Difference Water Index for each classified pixel within the geospatial region of interest; analyzing a harvest cycle and an amount of crop drying based on the spectral signature, the Normalized Difference Vegetation Index and the Normalized Difference Water Index for each of the classified pixel within the geospatial region of interest; counting the classified pixels to monitor and quantify the amount of crop dying and the harvest cycle; assessing the coffee estate sun-drying beans after monitoring and quantifying the amount of crop dying and the harvest cycle; and deriving a regional or global coffee productivity levels using the assessing of the coffee estate sun drying beans and comparing the productivity levels across a sample of farms.