Angle count sampling Angle count sampling Forest Measurement and Modelling. Although the method is efficient and theoretically unbiased, inappropriate selection of sample points or use of an angle gauge can lead to imprecision or bias. Ad hoc and subjective selection of sample points.
Samples overlap the edge or boundary of the stand.
Pushing the point, or incorrect placement of the angle gauge relative to the plot centre. Insufficient attention to borderline trees, i.e. trees close to the distance where a decision between IN and OUT occurs. The selection of sample points should be statistically valid. Appropriate sample locations can be chosen randomly or by a well-developed systematic sample. Statistically, each point within a stand is an independent sample point.