You stand at the center of your cruising plot and use the prism to count how many trees in a 360 degree circle around you are considered to be “in” or “out”…..You then multiply the number of trees that are counted as "in" times 10 to get a basal area. The tree in my previous pick would be counted as in. If the offset were just a little more to the right then it would be out and not counted. Someone correct me if I got that wrong....it's been a while.
You are right. But there is a little more to counting a boarder tree as "in or out". Experience and tract characteristics come into play.
Last edited by Drake322; 11/07/1711:42 AM.
Re: What is this used for?
[Re: CNC]
#2284688 11/07/1711:44 AM11/07/1711:44 AM
If the trunk isnt completely offset it is in, if completely offset it is out. If it lines up even with the stump you count every other one in. You then multiply by whatever factor the prism is, they come in 5,10 and 20 that I know about. The number you get is the basal area, which is the square foot/acre of the cross section of tree stems.
Re: What is this used for?
[Re: CNC]
#2284692 11/07/1711:49 AM11/07/1711:49 AM
You stand at the center of your cruising plot and use the prism to count how many trees in a 360 degree circle around you are considered to be “in” or “out”…..You then multiply the number of trees that are counted as "in" times 10 to get a basal area. The tree in my previous pick would be counted as in. If the offset were just a little more to the right then it would be out and not counted. Someone correct me if I got that wrong....it's been a while.
WTF did that guy say. That was some strange chit he was talking about. All he did was prove to me that I know absolutely nothing about looking at trees.
It's hard to kiss the lips at night that chews your a$$ all day long.
Re: What is this used for?
[Re: CNC]
#2284865 11/07/1703:12 PM11/07/1703:12 PM
In the 70's we did a test using a prism, line plot, and row count using the same heights for volumes. The 80 acre tract was cut with a IP company crew using the old TH-109 machines that cut the trees into 5'3" pulpwood. The prism cruise was the closest to the actual cut.
Re: What is this used for?
[Re: CNC]
#2284932 11/07/1703:56 PM11/07/1703:56 PM
In the 70's we did a test using a prism, line plot, and row count using the same heights for volumes. The 80 acre tract was cut with a IP company crew using the old TH-109 machines that cut the trees into 5'3" pulpwood. The prism cruise was the closest to the actual cut.
Back in my career with a paper mill, we used to buy a lot of Bowater/Citibank timber. I cruised a 40 one time and just tested if I put it on a 3x3 or just did 3 plots for whole thing. Worked cruise up and it was nearly identical on volumes!
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