I'm going to hang my TV to the wall and I want to know how much from ground is standard for 52 inch TV?
First, sit on your couch in the ideal viewing position (ie: where your butt imprint is). The bottom 1/3 of the TV should be at eye level when mounted. Everyone has an opinion about exact positioning, but this is more or less the general rule of thumb I've found from various sources, and it has always worked well for me.
I find most people mount them too high. No one likes sitting in the front-row at the movie theater, so why do it at home?
Just to add another preference: I like my TV a little lower; eye level around 2/3 up the screen (more in line with OSHA's computer monitor height ergonomic recommendations).
The only real answer is to try it, preferably with an adjustable-height table or something before it's permanently mounted. I built an entertainment cabinet a year or so ago, and in preparation spent several weeks with my TV on a coffee table with various stacks of books to find a good height. If you just spend 2 seconds looking at a cardboard cutout taped to the wall you're not going to get a good sense of how it feels.