Civil Engineering Reference
In-Depth Information
between these points. A technical way of saying this is to say that the points must be
Intervisible
. Intervisible simply means that you can see between the two points. If there
were a tall rose bush between points 1 and 2, it would be necessary to move one or both
points in order to see by the bush, unless the property owner wanted the bush cut down.
Another consideration is that the ground where each point is located should be firm and
relatively level so that it is easy and convenient to set the instrument there. If one of the
lines were to run along a street, the surveyor would want to take safety into considera-
tion and maybe run a line down a sidewalk instead of in the traveled area of the street.
A third consideration is that a surveyor tries to set the traverse points some-
where near points which are to be located or which are to be set. In this case,
points 1, 2, 3 and 5 are all relatively near the lot corners and each of the lot corners
is visible from these points. The blue dashed lines represent the survey lines from
the traverse points to the points to be located or set. Traverse point 4 was needed
because a building prevented seeing and measuring between point 3 and point 5.
A traverse is subject to the same rules of closure as the property lines. In the
example, it would have been possible just to use points 1, 2, 3 and 5 and not use
point 4. This is illustrated in Fig.
12.2
. Each of these points is near a lot corner
Fig. 12.2
An open traverse
