1. Plantmad Nursery (苗木屋)
  2. Big Trees

Measuring a big Cedar

So today Chiyoko, Martin & I headed out to measure the Larch Mountain Giant Cedar & see if it came close to the current State champion. Big trees are measured & compared on a point system, in a nutshell they get 1 point for each inch of circumference, 1 point for each foot of height & a quarter point for each foot of average canopy spread. Firstly we worked on getting a circumference measurement, we used a DBH tape that's calibrated to give you both circumference & diameter measurements without having to do any mathematics! This measurement should be taken at 4.5' if anything we were a little high so our circumference measurement is conservative. We got a circumference of 34' 2" & a diameter of 10' 9". Next we worked on getting a height measurement. We ran a tape out 150' then sited it in to the base of the tree & Martin used his clinometer to get a height reading. We also used the stick method to get a height reading and the 2 readings were within a foot of each other. We calculated 160' to the top of the highest dead leader & 134' to the highest living branch. Finally canopy, we took 2 measurements at 180 degrees from each other to get the canopy spread of the tree, these were then averaged together to give us an average canopy spread of 60'. So when we total up the points we get 410 for calliper, 160 for height & 15 for canopy for a total of 585. The current State Champion has 626 points so we didn't break the record but came close :^).....
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Martin working his magic.
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Martin working his magic.

  • <I>Big "C"</I>
  • Untitled photo
  • Untitled photo
  • Getting a circumference & diameter measurement.
  • Getting a circumference & diameter measurement.
  • Setting out the tape to calculate height.
  • Chiyoko holds the tape in place as we calculate height.
  • Sighting in the tape & clinometer to calculate height.
  • Martin working his magic.
  • Standing 160' from the tree using the <I>Stick Method </I> to measure height.
  • A few more pics
  • Rolling up the tape.
  • Now we work on canopy spread
  • Working on canopy spread
  • Another view
  • Another view
  • The low branch coming out of the cedar near the base is actually a Doug Fir that has been engulfed by the cedar.
  • Next to the Cedar is a surviving Old Growth Doug Fir (Who know why 1 Cedar & 1 Doug Fir survived right next to each other in this one spot while all their neighbors succumbed to the loggers axe).
  • Martin standing in front of the Doug Fir gives an idea of scale.
  • Untitled photo
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