Finding a location on an image

Hello folks I had posted a topic about zoomin a part of an image which I wanted for my project but now I want to add one thing and that is, I am having an image which is a city map and I want to find the pixel location of a particular area on the map. One thing that came was using combo box where the area could be given as input to search the map but I am not able to get the location of the area provided, please help me.

Let me make it clear.
I have a map which is saved as an .png image. I drew this map with reference to a point (lon = -121.933816666667; lat = 37.4125166666667) as the center. Now I want to mark another point on the same map image which is very near to the original point. The new point is (lon = -120.933816666667; lat = 36.4125166666667).
What I was thinking is I need to compare the distance from the center point to the new point and place a marker at that point. But, was not sure about how to implement it.
Any ideas or pointers will be helpful.

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