My father in law used a military system, called PADS. It was big, and rode in a JEEP.
Essentially, it records directions, and time.
Every bump. Every movement.
My dream is to be able to use one of these, with RTK. Get a good clear shot, in the field, to initilize the IMU, then walk to the woods, set it on the monument. Let it settle down. and store the point. Then, walk back to the field, and occupy the SAME or another RTK shot, and you now have a CLOSED LOOP, if every motion, up, down, or sideways is recorded. Somehow, in the back of my mind, they might need a "Backsite" to determine directions.
Now, the longer the loop, the more error is introduced. And, the more time goes by, the more it drifts.
However, it could be cool. And, I think it could be a game changer. But, how accurate are they? What are field procedures?
When I first started reading up on Javad, he had an Umbrella thing, with an IMU.
I wanted one...
Now, it looks like LEICA is coming to market with one. YAY!!
Anytime any mfr comes out with a new, and dynamic product, the Surveyors, and landowners are the winners.
Anybody know anything about these?
Are they accurate?
Can I get any "Hands on" stories?
Thanks!!
They used to be a back-pack.
http://www.trimble.com/gnss-inertial/AP15.aspx?dtID=overview&
I assume it's what's in PIGs. Recently I was shown a PIG plot compared to the GPS locations and it was amazing how accurate it was. And it went for 60 miles or so, how it's set-up I don't know, they must be somehow reset at the launcher. I do know they aren't cheap.
Smart pigs use a AGM which is a monument set at ground level on top off the pipe. You can put a box that has a clock built in on top of the monument. When the pig goes by it triggers a spike in the computer inside the pig. They use the multiple clocks set at maybe 5 mile intervals to control the speed . The AGM'S must help tie the pigs route to the pipeline route.
I also know someone that was in the military that used something similar and he said it rode in a Hummer it was so large. I assume its some kind of gyro system but don't know.
I've used both the Applanix POS, and the ZUPT back packs. Great for staking rough line in heavy canopy if you can live with 10-15' horizontal error in a mile. Post processed lines come in about 1/3 of that. These are used extensively in the twitterbugging world.
Tim Reed, post: 450154, member: 420 wrote: in the twitterbugging world.
What is this?
Twitterbugs / AKA Geophysical Seismic Exploration guys.
Tim Reed, post: 450163, member: 420 wrote: Twitterbugs / AKA Geophysical Seismic Exploration guys.
Times have changed. We use to call them doodlebugs.
I know I heard of IMU surveying by helicopter teams in Alaska., but that was a long time ago.... why would you want to use old technology to get bad data??
Andy J, post: 450596, member: 44 wrote: I know I heard of IMU surveying by helicopter teams in Alaska., but that was a long time ago.... why would you want to use old technology to get bad data??
IMU isn't the sole measurement source in this instance, it seems it is constantly providing data along with the GNSS to store a measurement. I have seen quite a few pictures floating around of angled pole measurements on known control with accuracy in the 0.02'-0.06' range. Pretty impressive technology released by Leica.
[USER=444]@Jules J.[/USER]
When I was a kid we used to call "Ant Lions" doodle bugs and spent hours throwing ants in their traps.
They didn't have video games back then just black and white TV, (with THREE channels) so we amused ourselves by playing outside from dawn to dusk climbing trees, playing baseball, riding bikes, fishing, and all of those now unheard of activities. 😉
We called them "mudbuggers".
Tagging for later.
