Pole Height Recommendation

[kasanmascheff (SK)]

Hi there,

what pole height do you recommend with an Emlid base and Tripod and Tribach?

I was thinking that if it is too high, it might become inaccurate since the tripod is always a little bit uneven (even with tribrach)…

What is your take on that?

Application is accurate survey mapping for construction and earth works…

[TB_RTK]

2m is normal i would say. But any height to get the job done is ok if you do it right.

[kasanmascheff (SK)]

2 meter total or on top of a , let’s say 150cm tripod?

[TB_RTK]

2m total.

[wizprod (Christian Grüner)]

Obviously the higher, the more distance error caused by angular error.

So far so good.

I usually say it depends a lot on your surroundings. There are some questions one could ask before placing the base:

• does 1-2 meters more elevation help me get a better signal?
• by extending the pole 1-2 meters, will the receiver start to sway so much that the increase in sky-view is nulled by the imprecision caused by the swaying?
• if mounted on tribrach, can I find a suitable measuring point for instrument height? (expeically true when using extension rods)
• do I trust my extension rod+adapters to be perfectly straight?

In answering all these questions for my self, I find that for the RS2 I do the following:

• setup a tripod with the usual recommendations for when setting it up for a total station
• assemble RS2, 15 cm Emlid extension rod, 5/8" to 20 mm tribrach adapter and tribrach.
• put it on the tripod
• level and align tripod/tribrach
• measure height to bottom of the RS2
• add 0.134 meters (this usually totals an antenna-height of just under 2 meters)
• good to go.

This I use in most situations, but I also have 0.5 and 1 meter extension rods for use in heavily vegetated or build-up areas. However, I’d rather move my base than use the rods, if possible.

[kasanmascheff (SK)]

Thank you, that answers all my questions!

[michaelL (Michael Lambert)]

2m on top of a mountain!