10-03-2013, 03:32 AM
I saw some survey crews on a the road I go to work lately, in fact over the past 2 weeks or so. They have those yellow tripods and measure stuff and so on. Now they are painting some white crosses on the middle of the road, about 4-5 per miles. I stopped at one of these as the guy was literarily watching the paint dry. I asked him what this is for, he said for an aerial survey. This is a back road through the woods, no traffic, and I guess these would be hard to see in the summer as the road is covered by trees, although they seem to paint these white crosses in some spots with fewer trees such as driveways or other areas with more open space.
Any idea why they can do with these? also why do they still do these surveys with those old fashioned tripods and optical instruments, can't they use GPS? I think the encrypted GPS signal is much more accurate than the unencrypted signal used in our GPS devices, but I would imagine these companies could get some compromise from government to allow them to use the encrypted signal for very accurate surveys.
Any idea why they can do with these? also why do they still do these surveys with those old fashioned tripods and optical instruments, can't they use GPS? I think the encrypted GPS signal is much more accurate than the unencrypted signal used in our GPS devices, but I would imagine these companies could get some compromise from government to allow them to use the encrypted signal for very accurate surveys.