Coordinate calculation

Authored by: Keith M. Wolhuter

Geometric Design of Roads Handbook

Print publication date:  April  2015
Online publication date:  October  2015

Print ISBN: 9780415521727
eBook ISBN: 9781482288728
Adobe ISBN:


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The designer works on survey plans in terms of a scale appropriate to the level of detail required. Route location could be on topographical sheets typically to a scale of 1:50,000 or, in the United Kingdom, 1 inch to the mile, which corresponds to a scale of 1:63,360. The horizontal alignment within the corridor defined during route location is normally done on survey plans to a scale of 1:10,000. Detailed design of features such as intersections could be to a larger scale again, such as 1:1000 or 1:5000. The fact of the matter is that these are all lines on paper. They need to be converted to lines on the ground. This is done by engineering surveyors who require information defining the road centreline and the various detail matters such as kerb lines at intersections. This information is provided in the form of coordinates. Armed with this information, the lines on paper can be set out to enable the construction of the road.

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