This map is showing normalized vegetation index (NDVI) of Bangladesh which was calculated from red and infrared bands of 14 Landsat 8 satellite images. These images were captured in between 12 to 23 November 2016.
The dark green areas in the map are forests or water-logged agricultural land; next level of dark green areas are rural settlements. Rest of the green areas are agricultural areas. Urban areas, water-bodies, and sandy areas are brown in color.
Find high resolution version of the map in this link.
Satellite Image of Bangladesh - 2016
Satellite Image of Bangladesh
Night Lights of Bangladesh - 2012