In QGIS I managed to display the ship traffic density from marinetraffic.com as a background tile map using the TileLayer plugin. Here is my TileLayer.tsv file:
#title credit serviceUrl yOriginTop zmin zmax xmin ymin xmax ymax
MarineTraffic Mtra http://tiles.marinetraffic.com/ais/density_tiles/{z}/{x}/tile_{z}_{x}_{y}.png 1
for example one of the tiles has the url: http://tiles.marinetraffic.com/ais/density_tiles/8/164/tile_8_164_109.png
For a selected area, Persian Gulf, I need to convert the map to a GeoTiff raster file in the UTM zone 39N projection. When I enable on-fly projection in QGIS the background map is correctly reprojected:
But how do I export it to a raster GeoTiff file? I couldn't find any export of "save as" option for the background tile layer map in the QGIS menu.