Describe how each of the following could be used in highway survey location: (a) aerial photogrammetry (b) computer graphics (c) conventional survey techniques
What will be an ideal response?
(a) Aerial Photogrammetry: Aerial photogrammetry is used in identifying
suitable highway locations and in preparing contour maps suitable for cross
sections. This involves obtaining the aerial photographs and determining distances
and elevations from these photographs.
(b) Computer Graphics: Computer graphics are used in identifying suitable
highway locations by combining photogrammetry and computer techniques. The
procedure also involves the use of aerial photographs to determine distances and
elevations. In addition, the horizontal and vertical alignment of a proposed
centerline can be obtained and displayed on a monitor. This enables the designer
to make alignment changes and to immediately see the effect of these changes.
(c) Conventional Survey Techniques: Conventional surveys are used in
identifying suitable locations by determining distances and elevations for all
natural and man-made land features. Contour maps are then obtained which can
be used to identify alternative locations. Profiles, showing the change in elevation
along a proposed centerline, and cross sections at selected stations along the
proposed centerline can also be developed.
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