I have a third-party application with a city map of size
There are data on this map which contains x and y coordinates. I want to transform these coordinates to latitude and longitude. I know this map is some sort of Mercator projection but I don't know what exactly.
There is the distance coefficient:
I've tried formulas from wiki (https://en.wikipedia.org/wiki/Mercator_projection) but with no success.
Can someone help to find out transformation formula?
Here are few coordinates which I know:
(lat,lng) - (x,y)
(50.370186,30.458433) - (53655,86502)
(50.404793,30.613958) - (68149,81437)
(50.458076,30.604239) - (67240,73634)
(50.488285,30.526358) - (59988,69221)
(50.9333,29.903046) - (1920,3775)
(50.114937,31.281656) - (130375,123690)