Point sampling

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POINT SAMPLING-COMPUTE TREES PER ACREExample:• BAF 10 prism• Only in the 10-inch diameter class27 trees were measured• 12 pointsTF i=⎛⎜⎝BAFBA per⎞⎟tree ⎠⎛ 10 ⎞TF i= ⎜ ⎟ = 18.349⎝ 0.545 ⎠TPA⎛⎜ ∑ ni× TF= ⎝ npi⎞⎟⎠⎛ 27×18.349⎞TPA = ⎜⎟=41.3treesper acre⎝ 12 ⎠41.3 TPA for the 10-inch diameter class
POINT SAMPLING - VOLUMETwo methods:1. Volume Factor (VF) method• Natural extension from plot <strong>sampling</strong>2. Volume/Basal Area Ratios (VBAR) method• Can be used in double <strong>sampling</strong>• Both methods require calculation of Tree Factor• Both methods require diameter and height measurementsfrom some or all prism selected trees• Hand calculation using either method is labor intensive
Page 2 and 3: POINT SAMPLINGA method of sampling
Page 4 and 5: POINT SAMPLINGEach tree has agiven
Page 6 and 7: POINT SAMPLING VS.FIXED-AREA PLOT S
Page 8 and 9: POINT SAMPLING - BAFBasal area fact
Page 10: POINT SAMPLING - PRFPlot Radius Fac
Page 13: Therefore each tree tallied represe
Page 16 and 17: POINT SAMPLING-COMPUTE TREES PER AC
Page 20 and 21: VOLUME - VF METHODPoint cruise:Meas
Page 22 and 23: VF METHOD - EXAMPLEFirst, compute v
Page 24 and 25: VF METHOD - EXAMPLEMake a table wit
Page 26 and 27: TotalMake a table with the collecte
Page 28 and 29: POINT SAMPLING - VOLUME EXAMPLEMake
Page 30 and 31: POINT SAMPLING - VOLUME EXAMPLEVolu
Page 32 and 33: • International ¼ in rule• For
Page 34 and 35: DBH Plot 2LogsBA/ TF Per acre …1
Page 36 and 37: DBH Trees/ac BA/ac Volume/acP1 P2 P
Page 38 and 39: POINT SAMPLING METHODOLOGYTwo commo

Point sampling

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