I wanted a utility the other day, and couldn't find it...

I'd like to be able to load a rectangular map (equirectangular, or not) image, and specify the latitude and longitude of the four edges (in the case of a full world equirectangular mapping, that would be +90, -90 (north to south) and +180, -180 (east to west)) and the planet radius/diameter in "units".

Now let the user pick zoom in/out and pick any two points, to calculate and display the great circle distance

If I had a programming environment more recent than VB3.0, I'd try putting this together my self 'cause I don't think it is too complicated.

-Rob A>