How accurate are we?

[Illuminated]

quote:Originally posted by afarensis

but is an issue when you are measuring things in relation to a fixed point in time and space when the item you are measuring isn?t fixed, doesn?t it?

So long as the fixed point remains fixed while the rest of the survey is conducted, the survey itself will be accurate. I was never the greatest at understanding the arcane depths of surveying, but surely all you need to do is measure in your field boundaries / nearby buildings, scale them and overlay with the latest accurate map and you have an accurate survey in the right place?
Adding the date of the map used for fixing the survey should be included in the data file so it can be seen if it needs updating to future maps.


To answer the original post, I've been known to use a single tape and a compass on a watching brief in a pinch...
ie - this point on the plan is 2.5 metres due north of the right hand gate post.. stick a nail in, 2 metres due north another nail and, voila! A baseline.