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| One often needs to know the distance between two points.
Usually when this happens, it is possible to determine the distance by measuring it with a
tape measure, ruler, or some similar device. But, to do this requires direct access to the
points in question, i.e. you have to go to each point to make the necessary measurements.
Sometimes getting to a site is not possible, as for example when a point of interest is
on the opposite side of a deep, impassable gorge. If this happens, one needs to invoke
other methods of measurement - methods that do not require you to cross the gorge. This is
where remote distance measurement comes in. Remote distance measurement, or "surveying",
as it is usually termed, provides a means for measuring distance between points that may not
be accessible.
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