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You don't say how high the dome and deck is to be from the ground.
How high ?
The higher it is the larger and deeper your foundation should be.
I recall reading about people who are subject to freezing earth (which you may be ?) and the effect that this has on moving the entire structures.
The solution is to ensure that the foundation is below the ground level that can get frozen.
Of course the type of ground you are digging into is relevant here also, eg soft water laden earth Vs rock etc etc makes a difference.
At the end of the day your pier is only as good as the weakest link - that also depends on the diameter and wall thickness of your pier (and material !).
Since you are going to lots of trouble to create a good imaging platform, dont skimp on the last $100 on the pier material - it is what makes all the difference.
What diameter and wall thickness did you have in mind ?
Cheers
Rally
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