Rich_WI said: (quoted from post at 22:42:02 04/12/10) Biltmore sticks are accurate to a couple feet, if JDemaris needs to be more accurate than that, he should by all means get somebody to help him with that.
Besides, the next best information given to JDemaris was either $2000 equipment that he dont own or people saying to measure shadows with no formulas given or explained. A Biltmore stick is common and fairly easy to get. You can even make your own using charts available on the internet for custom distances, say your arm is longer and you want to hold the stick 25 inches from your eye, they have a chart for that. Want to stand 100 feet from the tree, I seen that chart too.
Using the charts on the internet, I made my own stick for my own eye distance and since I didnt need it for measuring board feet of lumber, I only wanted it for tree height, I just used the chart for my measurements. My stick just shows height in 2 foot incriments, since my eye easily can cut those incriments in half, I consider it accurate to 1 foot. If I ever need to calibrate it, I could take it to work and measure some multi story buildings that were shot with a lazer and I could compair to that. I really dont that will be needed though as I dont think I will need it to be THAT accurate.
I did provide a link to the simple formulas. A Biltmore (hypsometer) is based on the principle of ratios exactly as is the shadow measurement, but the shadow measurement is more exact in 2 ways. 1) it relies on measurement with a tape measure, not an eyeball 'it is about there' while trying to focus on both near & far objects, and 2) in the shadow measurement technique, there is NO arc length vs chord error, which is built into the Biltmore (hypsometer) stick technique (small, it may be).
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