I am trying to create a kml version of a map tile using gdal_translate on a geotiff with alpha layer (link [here][1]) as follows:

    gdal_translate -of KMLSUPEROVERLAY input.tif output.kml

however, the resulting kml file has a black area where the alpha layer should be - see [here][2] for a link to all the input and output files (and subdirectories produced by the operation).

Any ideas as to how I could produce a kml file without the black area (also how I could generate only a single standalone .kml file, rather than a .kml linking a bunch of subdirectories as in the zipfile linked) would be greatly appreciated.

Thanks


n.b. gdalinfo on the input geotiff:

    Driver: GTiff/GeoTIFF
    Files: input.tif
    Size is 3822, 3837
    Coordinate System is:
    PROJCS["WGS 84 / Pseudo-Mercator",
        GEOGCS["WGS 84",
            DATUM["WGS_1984",
                SPHEROID["WGS 84",6378137,298.257223563,
                    AUTHORITY["EPSG","7030"]],
                AUTHORITY["EPSG","6326"]],
            PRIMEM["Greenwich",0],
            UNIT["degree",0.0174532925199433],
            AUTHORITY["EPSG","4326"]],
        PROJECTION["Mercator_1SP"],
        PARAMETER["central_meridian",0],
        PARAMETER["scale_factor",1],
        PARAMETER["false_easting",0],
        PARAMETER["false_northing",0],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs"],
        AUTHORITY["EPSG","3857"]]
    Origin = (-13539823.138956749811769,4690722.589982722885907)
    Pixel Size = (0.122995666356360,-0.122995666356360)
    Metadata:
      AREA_OR_POINT=Area
      TIFFTAG_DOCUMENTNAME=/mnt/dd/data/1417212380_DDSPIDER/tmp-0-0.tif
      TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
      TIFFTAG_XRESOLUTION=72
      TIFFTAG_YRESOLUTION=72
    Image Structure Metadata:
      INTERLEAVE=PIXEL
    Corner Coordinates:
    Upper Left  (-13539823.139, 4690722.590) (121d37'49.08"W, 38d47' 0.99"N)
    Lower Left  (-13539823.139, 4690250.656) (121d37'49.08"W, 38d46'49.09"N)
    Upper Right (-13539353.050, 4690722.590) (121d37'33.88"W, 38d47' 0.99"N)
    Lower Right (-13539353.050, 4690250.656) (121d37'33.88"W, 38d46'49.09"N)
    Center      (-13539588.094, 4690486.623) (121d37'41.48"W, 38d46'55.04"N)
    Band 1 Block=3822x1 Type=Byte, ColorInterp=Red
      Mask Flags: PER_DATASET ALPHA 
    Band 2 Block=3822x1 Type=Byte, ColorInterp=Green
      Mask Flags: PER_DATASET ALPHA 
    Band 3 Block=3822x1 Type=Byte, ColorInterp=Blue
      Mask Flags: PER_DATASET ALPHA 
    Band 4 Block=3822x1 Type=Byte, ColorInterp=Alpha


  [1]: https://www.dropbox.com/s/qsa8akn4awjjwf7/input.tif?dl=0
  [2]: https://www.dropbox.com/s/izcb58akn6td518/kml_convert.zip?dl=0