A Note on the Line Intercept Sampling Method

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In most applications of the line intercept sampling method it is difficult to replicate the transect line more than two times, for reasons such as time, money, and field difficulties. Thus it becomes difficult to estimate variances for parameters of interest. In this paper, the Horvitz-Thompson theory of unequal probability sampling is applied to line intercept sampling. For the case when the transect is replicated several times a new estimator is obtained. Estimation of variances using several replicates of the line transect is considered for parameters of interest in the line intercept method. The procedures are illustrated with an example.