Many methods and techniques utilize a combination of different bandwidths in the visible, NIR (Near Infrared), and SWIR (Shortwave Infrared) regions for glacier ice mapping. In this study, we investigated and compared various techniques to map the clean ice area of the glaciers using Landsat 8 and Sentinel 2 images. The effectiveness of different techniques and effects of different sensors on the mapping accuracy was also assessed in the Dhauliganga basin of Pithoragarh district, Uttarakhand state of India. Also, the time series composite of Sentinel-1 SAR (Synthetic Aperture Radar) data was used as reference data for estimating the bare or clean glacier ice area. It was reported from the study that clean ice/snow areas mapped using band ratios Red/SWIR and NIR/SWIR from Landsat 8 were overestimated by 4.41% and 4.94% respectively which were larger as compared to Sentinel 2. The most rigorous and well-known technique for glacier mapping, NDSI (Normalized Difference Snow Index) was also checked for both sensors. Clean ice/snow areas mapped from NDSI were found to be 1.35% less as compared to Red/SWIR and 2.62% greater as compared to NIR/SWIR bands of the Landsat 8. However using the same bands from the Sentinel 2, NDSI overestimated 0.67% and 5.27% respectively over both the ratios.