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Unformatted text preview: CIVL 1009 Survey (20102011 Semester 1) Chapter 6 Triangulation & Traverse 1 Chapter 6 Triangulation & Trilateration CIVL 1009 Survey (20102011 Semester 1) Chapter 6 Triangulation & Traverse 2 Control Survey Scope of work • Triangulation • Trilateration • Traverse CIVL 1009 Survey (20102011 Semester 1) Chapter 6 Triangulation & Traverse 3 Triangulation Principle • Measurement of the angles of a series of triangles • Use of trigonometry for computation, e.g. • Coordinates of A and B are known • Compute the distance AB • Measure Angle A and Angle B • Determine the coordinates of unknown point C • Caution: Angle C are normally measured also for error checking (sum of angles of triangle equal to 180 degree) • All angles of every triangle in the network are measured and adjusted to minimize the effects of measurement errors CIVL 1009 Survey (20102011 Semester 1) Chapter 6 Triangulation & Traverse 4 Triangulation Principle (cont’d) • Measurement of the angles of a series of connected triangles • The triangles may adjoin or overlap each other, and form the network as, • Chain of triangles • Quadrilaterals • Centre point system • Advantage of Triangulation is that distance measurement is not required • Triangulation stations network can be extended over a large area CIVL 1009 Survey (20102011 Semester 1) Chapter 6 Triangulation & Traverse 5 Trilateration Principle • Trilateration measures the lengths of all sides of a series of triangle; while triangulation measures the angles • Trilateration becomes a useful alternate method to triangulation because of the development of Electronic Distance Measurement (EDM) technique • Again, lengths of every side of all triangles in the network are measured and adjusted to minimize the effects of the measurement errors CIVL 1009 Survey (20102011 Semester 1) Chapter 6 Triangulation & Traverse 6 Traverse Principle • Measurements of a series of lines between connecting points, e.g. distance and direction • The route of the traverse line can be adjusted for obstacles such as timber,...
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This note was uploaded on 12/01/2010 for the course CIVL 1009 taught by Professor Proftam during the Spring '10 term at HKU.
 Spring '10
 proftam
 Surveying

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