ME2 Scanning planets question

When scanning a planet for elements is it broken up into its square quadrants? or is it really specific on where you launch the probe to get maximum value?

you are supposed to put the probes where you get the highest readings you can tell by looking at the graph and by your controller vibrating. thats all there is to it. Oh and to directly answer your question so far from what i can tell is its specific to where you put it. I know theres a grid overlays the planet but it doesn't really affect anything.

It's super annoyingly tedious. I wish they'd have made it more quicker, maybe added more concentrated areas or made an upgraded system where it shows you exactly the position of the minerals for a few credits + Platinum or something.

But, instead I have scanned about 20+ planets so far and have only about 60k of each to show for it. So, I think I'm doing something wrong... but, eh. It's not that great.