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Abstract
This thesis reports the findings of two Precision Forestry studies. In the first, a sector-fork and laser calipers were tested in three forest types. Mixed results were found that vary by forest type. They suggest direct diameter measurements can be significantly different than measurements collected at a distance with laser calipers. Sector-fork results were also varied; suggesting forest type can be a significant factor. Light conditions had no significant effect on caliper measurements, and results were mixed on the significance of forest type on measurement error. In the second study, the static horizontal accuracy of two GPS receivers was examined. Tests suggest forest type significantly affects accuracy. Season was a significant factor with therecreational-receiver but not the mapping-grade receiver, and the vertical holding position provided significantly lower error than other positions with the mapping-grade receiver. Further, environmental variables seemed to have no effect on position accuracy of both receivers.