[gradsusr] How to read latitude/longitude data from background map

[Tsai Ray]

Dear GrASD users,
I already have a high-resolution regional backgruond map data(same formation as hires and lowres), and
now I'm trying to read the latitude/longitude from it by fortran program.
But I'm not sure about the formation of background map data, and still can't get the correct latitude/longitude information.
Is there any way to solve this problem, please~~~~

Thanks,
Ray 		 	   		  
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