Ever wonder why fixed height prism poles are 2m and not 6.5' or some other even number ? I am building a new box for my new truck . ( replaced my old 10 year old ranger ) and was hoping to be able to keep the pole together but it just does not fit in the short bed by just a hair . What does 2m have to do with anything .
This one says "6 feet", don't know if that is correct or not (maybe they rounded?)
But it's probably because the rest of the world, geodisists, the NGS, etc, use meters. American Surveyor are small market compared to the others.
http://www.engineersupply.com/cst-berger-aluminum-gps-rover-rod-69-107.aspx
I've got 6 of the Crain Alumalite 2 Meter fixed height poles, numbered the tops and bottoms out of the box brand new as matched pairs. The problem with any of the two piece poles is they tend to get a lot of "run out" i.e. like a warped billiards cue stick.
What I've done to try and keep them "true" is to haul them in the 2 pieces---but here is the ticket---go to your local dollar store etc. and get one of those foam "pool noodles" that the kids play with in a swimming pool, cut down the length of it with a sharp razor blade and then cut it into 6 or 8 inch sections and fit a couple of them to each section of the pole. It gives them a bit of vibration protection riding in the survey rig.
I just did an OPUS today, NGS wanted the height in meters. We are the only country that uses Feet. 2 meters is about 6 and a half feet, but not quite. why don't you drill a hole in the tailgate to make up the 2 inches that it is too long by. or put the rod in at an angle.
We had the problem of the pole not fitting into our survey truck box. We were on a construction site and there was a lot of in and out of the truck. Our work-around was just to screw the foot off each time we put the rod into the box. After a time it just became part of the process.
We used to have the same problem with fitting the fixed height rods in the truck. We moved to the Seco 2m collapsible rover rod. It also works better with the SECO door mount.
2-Meter Carbon Fiber Snap-Lock Rover Rod
This is exactly what we use for all of our crews. Works great and way better than the 2 pole setup.
I use the Seco 2 meter collapsable rod as well. It is great.
Howdy,
The reason for the two-meter height above ground is related to multi-path and tropospheric effects. The height allows multi-path to be more easily identified by hardware and software as well as allowing better modeling of tropospheric effects which could be mis-treated as multi-path and the inverse.
There are a number of papers addressing the issue accessible through Internet search.
Cheers,
DMM
most of the DC software stores the height in meters. If you put in feet it'll convert it behind the scenes.
> but it just does not fit in the short bed by just a hair .
Sounds like a good excuse to buy a bigger truck!
Here is the finished box . I made a clip holder to haul the prism poles around the job with out breaking them down . When jobs done then they go back into the pvc . even have room to put the instruments on the side of the box.
Is pole #1 ~ 0.04' short?
😉
> This is exactly what we use for all of our crews. Works great and way better than the 2 pole setup.
+1
SECO makes a quick release adapter for your 2M poles. They have become quite popular with our clients. Quick Release Adapter for Rover Rods
since i cant see the bottom of the rods I cant say for sure but if all the rod bottoms are level the tops are different heights.....or look that way in the pic :0