Sean, things like that need to be considered and taken into account if applicable. In a large tree that is stable in the soil the lower trunk should move very little even in a wind storm and it will return to its original position if things are still good afterwards. A tree that has been...
A clinometer or a laser rangefinder could detect movement from a fixed location if you had a base measurement to compare with. But I would think that with that much movement failure would be eminent. Setting a hard point, like a small eye screw, that you can hang a plum bob from, can detect...
There are still laser clinometers out there that cost that much but they don't do a better job. With the Forestry Pro I can range and get the accurate heights of any tree within 1000', all while standing in the same spot. It is a great tool if you are doing tree inventories.
Sean, if you...
http://www.nikon.com/products/sportoptics/lineup/laser/forestrypro/index.htm
I use the Nikon Forestry Pro. It is the least expensive one that I have found that still works well.
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