New Post: Add image but like a polygon not marker

You were quick radioman, thanks. So these are the bounding coordinates for the image.

Bounding_Coordinates:
West_Bounding_Coordinate: -80.107136
East_Bounding_Coordinate: -59.729722
North_Bounding_Coordinate: 48.502223
South_Bounding_Coordinate: 38.660689

How do I set it in the code. I only see two variables (gtl and gbr). What exactly are these (gtl and gbr) for?