Quote:
Originally Posted by Geronimo '74
Morning gents!
Photogrammetry huh, I had that course when I was still in school, but not the stereo version.
Lol, I found it hard enough in 2D.
It is indeed a proven technique, moreso than laser suveys. I actually don't know if laser surveying is more reliable now, I've been out of the survey loop too long.
It's a bit odd that you still need assistance from a surveyor on the ground, but I suppose it is the best way to do it.
Are you very weather dependent? I suppose you do not need cloudless skies and have tot do the surveys preferably around noon to minimize shadows, or do you?
Oh yes, guys, IT IS FRIDAY!!!!!!!!!
 And that's just fine by me! |
The new LIDAR systems are a great way to do it now days. The downside for a LIDAR is the price, about a million bucks once you get all the bells & whistles needed to make it work. With a million dollar investment you have to keep that sucker busy all the time. Trying to make the payments on a million dollar piece of equipment that will be outdated by the time it is paid for is beyond our means. Our camera is a Leica RC-30 that cost way more than a pair of new 911 Turbos.
We can do volume calculations even on overcast days, as long as the cloud deck is high enough for us to fly under. It actually makes it easier for the piles of carbon black or coal. The shadow areas on a pile of very black stuff can be hard to see any detail. The customer does not even want a picture, just the volume of the stuff.
For most of our photography we shoot two hours after sunrise and two hours before sunset. Full sun and clear skies. A pretty day for golf does not make a good day for aerial photography. Clouds or cloud shadows pretty much shut us down if the customer wants a pretty picture.
Shadows make things look better. A ulitity pole just about disapears if you are looking straight down. The shadow lets you know it is there, and the bottom of the shadow is the bottom of the pole.