Personally, I think Google Earth is accurate (enough)... You can use measurement tools to measure distances within Google Earths application, and they are pretty accurate from what I've seen.
Now hear me out... I don't have any hard evidence that says it is 100% accurate... Because I wasn't using my notebook with Google Earth out in the fairway while I was standing on a sprinkler - getting a number from Google Earth and then shooting the same number with a laser to compare it to the sprinkler.
But my point is that there are some courses that I've played enough to know what club I'm hitting from a Par 3... And when I measure the distances from the tee box to the center of the green, the numbers I'm getting from Google Earth are very close to what I see on the marked yardages for that hole - or what I've found with my GPS (Golfshot). So I think Google Earth is pretty accurate. Definitely within 2 to 3yds. And I think that is pretty fair to use when trying to map out a chart like the OP is doing.
With that being said... And as others have said... The chart example the OP listed was pretty useless. But I don't want to bash the guy because he said it was just an example and he was going to fill more data in. So it is what it is...
The charts are only going to be useful if you have put the time in to make them easy to read, they are fairly accurate, and they help you focus on your strategy you've mapped out for that given hole.