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a line transect looks like a few lines and dots used to mark a certain area.
In practice, systematic sampling is used on account of its simplicity and convenience. It's easy to explain to the people doing the actual work. It can be justified theoretically wherever the population from which units are to be sampled systematically are randomly distributed. It can be used for sampling households, sampling callers on a telephone line, sampling plants along a transect in (say) a field, sampling people passing through customs, and so on.
A line of best-fit.
A straight line, a telephone line, a shipping line, a fishing line.
A line intersect is a point on a line where another line or object crosses the line.