SPoT API. How to understand X and Y

unknown

Hi

I have read the API explorer and I know that Im able to query the properties of a radiomap. I get information like "width", "height" and "scale" got it!
But when I query about locations, I get information about "X" and "Y".
How can I understand that X and Y position?

X= 0 and Y =0 would represent the left and bottom corner?
If the width= 1500 and height = 600, X and Y represents the bosition inside the square formed by the width an height?<BR /><BR />Regards