Assessing downscaling limits of spatial resolution for awifs and landsat 8 data as compared to liss IV

Abstract

Downscaling spatial information has a certain limit. Change in resolution of input image from its original resolution either loses or gains information. To understand this limit accuracy of the downscaled information has to be assessed. This research assesses the downscaled information of AWiFS and LANDSAT 8 as compared and validated by LISS IV. A total of 200 sample points were collected using Systematic Random Sampling. The results showed that the overall accuracy for the supervised classification was 95% for LISS IV where Kappa statistics was 0.92. As the resolution LANDSAT 8 was reduced from 10% to 50% the overall accuracy varied from 84% to 73.5% with 0.79 to 0.65 Kappa coefficient. For AWiFS at the same reducing resolutions, the overall accuracy varied from 80% to 67% with 0.72 to 0.56 kappa coefficients. The results showed that the downscaling limits for AWiFS and LANDSAT8 are only 10% of their actual resolutions. Any downscaling beyond this limit will result in precious information being lost.