I have a coordinate database using coordinates like this: 3288396.9786247308, -11102996.686625781
I used a random website (Coordinate Menu Widget) to look it up, and it went right where it was supposed to, so it must be fairly universal.
My first question is, what is the name of this system so I can learn how to convert it? I thought it was UTM but I haven't been able to convert it with any online tools.
Second, do you know of any programming libraries that convert this (PHP, JS, Java, C#, etc.)? Preferably PHP.