How and when the conversion works?

[robort]

Hi @everalan, thanks for your great job on this work.

I'm just curious how you come up with the conversion method, and under which scope/conditions it works?

I tried your code with some of the input like [2000000, 3000000], expected output is [17.966110196716, 26.160794017678] with baidu map APIs, but the result with your program is [26.949165293528, 26.160794017678]

Any information is appreciated! :)