It was a .h5 file. I converted the datasets to .tif format using gdal. Now I want to assign projection to those files but the prescribed projection of EPSG:9805 is not found in gdal. I tried other projections like Mercator (variant A) and web mercator, but they dont seem to fit when I overlay a shapefile of the same area on it. Can anyone tell if I am going wrong anywhere or suggest some other alternative.