13.1 - Density Estimation Methods for Line and Point Transects

Line transect sampling is usually used to sample objects for which detectability depends on location relative to the observer.

The objective is to estimate the density of objects in the study region.

Examples include birds, mammals, and plant species.

image of a bird
image of a dolphin
image of a flower

Here is a picture for line transect method.

image of the transect method

In the following sections,  we will introduce the Narrow-strip method, the smooth-by-eye method and parametric methods.