The area that i have been work have about 159695,938 km² and I am mapping the deforestion on this with NDVI. I had to use 2 years to remove all the clouds (eg. 2015-01-31 , 2016-12-31) using a reducer.mean and cfmask band (surface reflatance Landsat 8 image), and when i export.to.drive i got the images separated. Is it possible to join this mean NDVI image in a single image to export? I will use this image in a geoprocessing software.