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We don't do the survey and civil drawings as we send them out to consultants. That doesn't happen until later so I need to have something to show some kind of site plan for schematic drawings. Most of the time it's very pre-lim so I just will trace over some google map views to show roads and parking lots and buildings. I've noticed that the accuracy of my site plan mock up depends greatly on the angle the satellite is taking the picture from. Certainly it's not off by 50% but I've seen it be off by 10%-20% in one direction because of the angle the picture was taken. I'm just doing them to show clients in planning stages so if it's off 5-10 feet on a 300 foot property line it doesn't matter much. The drawings are just to show clients the existing buildings and roads are here and the new building will be here. The civil guys will make an accurate site plan to build off of. If something is really close to something else I might go out and actually measure to make sure it fits, but usually things are spread out enough.
I'd ask where they are getting the dimensions from because they seem off to you. On a remodel I've had a original site plan from like 1966 that I scanned and scaled to be the right size.I traced over that for my pre-lim plan. After the real civil plan came back it was no where even close to the old plan I had nor the new plan I made from that. It was like a guy in 1966 was just standing in the field drawing it by looking around. haha
Nick DiPietro
Cad Manager/Monkey