= The `gdal_translate` utility =
  ''The official documentation for the `gdal_translate` utility is http://www.gdal.org/gdal_translate.html.''

'''when to use `-a_ullr`''' - ''Assign/override the georeferenced bounds of the output file.''

Use the `-a_ullr` option to add coordinates and pixel size to your raster. Using `-a_srs` alone only adds information about coordinate system without modifying the coordinates themselves ( i.e. upper-left coordinates, pixel size and so on). So if the source image doesn't provide this information to gdal they need to be added by hand.