Week 7 Flashcards
(9 cards)
Contour
A contour is a line that joins all points of the same height relative to a datum.
Elevation
The height of a point relative to the Mean Sea Level (MSL).
Contour Interval
The height difference between successive contours, which is constant on a topographic map.
Constant Distance Between Contour Lines
Indicates constant gradient of the ground.
Main Use of Contour Plans
To create vertical sections.
Coordinates for area calculation
If the coordinates of the points are known then the enclosed area is calculated as the sum of the trapezoid areas formed by the points and their projections on the y- or the x-axis moving CLOCKWISE.
Chainage interval
The strip width used in volume calculations.
Level section
A cross-section that is flat and does not have a gradient.
Partial embankment
A combination of cut and fill.
