Sampling Strategies using the Virtual Forest Tutorial

The sampling strategies used in the virtual forest tutorial were Haphazard sampling, Random sampling and Systematic sampling. The fastest sampling strategy was Systematic with an estimated time of 15 hours and 34 minutes. Followed by Haphazard with 16 hours and 31 minutes. Followed by Random Sampling with 24 hours and 48 minutes.

The two most common species were the Red Maple and White Oak. While the rarest species were Yellow Birch and White Ash. A comparison of the percentage error of the different strategies for the two most common and two rarest species can be found below in the table.

Percentage error

  Haphazard Random Systematic
Red Maple 2.9% 10.3% 6.8%
White Oak 15.5% 16.77% 31.4%
Yellow Birch Absent Absent 75.6%
White Ash Absent Absent Absent

 

The accuracy of the three sampling strategies had variations based on species abundance. The most common species in all sampling methods was the Red Maple which had a relatively low percentage error. This exhibits good accuracy. For the least common species, Yellow Birch and White Ash exhibited a high percentage error or absence.  These sample strategies potentially show limitations in accuracy for rare species. Haphazard and Random sampling strategies demonstrated higher accuracy than Systematic. This is because the percent of errors was relatively low.

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