Which coordinate system does MapTiler use for its "Photoshop Overlay for Google Maps"

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Which coordinate system does MapTiler use for its "Photoshop Overlay for Google Maps"

I am attempting to use this MapTiler webpage to create a background image that I can position my image over and then use GDAL to generate tiles. My process is:

1. Position the map on the linked page over the area I'm adding a overlay to.
   
2. Save the static map image and the four coordinate values representing west, south, east, and, north.
   
3. Bring the saved image into Photoshop and use it as a background to create my overlay image. The new image always has the same dimensions as the background.
4. I then use gdal_translate to create a GeoTIFF from the overlay image and the saved coordinates. Here is an example of the parameters used. This command runs without error.
   
   gdal_translate -of VRT -a_srs EPSG:900913 -gcp 0 0 west north -gcp width_of_your_input_map_file_in_pixels 0 east north -gcp width_of_your_input_map_file_in_pixels height_of_your_input_map_file_in_pixels east south your_input_file_name.png your_output_file_name.vrt
   
5. I then use gdal2tiles.py to generate the tile set. Here is an example of that command:
   
   gdal2tiles.py -p mercator -z zoom_range name_of_output_file.vrt
   
   Which returns the error:
   
   ERROR 1: Too many points (2704 out of 2704) failed to transform,unable to compute output bounds.
   

I believe the problem is that I'm substituting the coordinates from the MapTiler webpage which are in this form I'm not familiar with.

-4891969.810251281 -26369557.159749157 95295571.90369494 73817984.55419706

So, what coordinate system am I looking at here? How can it be converted into something gdal_translate understands?



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