SURV1200 Lecture Notes - Lecture 5: Azimuth, Theodolite
2 Jun 2018
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5.Traversing
What is traversing?
Measuring angles and distances, and then calculating the location (E, N) of critical points
1. Assume Coordinates for Aare known and fixed.
2. Calculate the change in East and North Coordinates for each line in the traverse.
The changes in East and North Should make logical sense
3. Check the sum of the changes in East and North values should be =0.000 this is the
calculation of misclose.
Calculate the coordinated of B and C and check the coordinate of A.
Types of Traverse
Closed Loop Traverse
Measure all internal or external angles
Measure all lengths of all sides
Need one Azimuth line
Strength: Good check on coordinates closure and bearing closure.
Weakness: Scale error in distance measurements.
Requires: one coordinate point and an azimuth line, or two coordinates
Closed Link Traverse
Measure an Azimuth line to commence traverse
Measure all angles
Measure the length of all sides
Measure an Azimuth line to conclude traverse
Strength: Good check on coordinate closure and bearing closure and distance scale error
Weakness: Relies on the being no error in the two known coordinated marks, and two azimuth
lines.
Requires: two coordinated points, and two azimuth lines, or two coordinated points at each end
of the traverse.
Open traverse
Measure angles at all theodolite stations
Measure the length of all sides
Angle measurement for an azimuth line
Strength:
Weakness: No checks on observations
Required: One coordinated point and an Azimuth line, or two coordinated points.
find more resources at oneclass.com
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Document Summary
Measuring angles and distances, and then calculating the location (e, n) of critical points: assume coordinates for aare known and fixed, calculate the change in east and north coordinates for each line in the traverse. The changes in east and north should make logical sense =(cid:1856)(cid:1866), =(cid:1856)(cid:1855)(cid:1867: check the sum of the changes in east and north values should be =0. 000 this is the calculation of misclose. Calculate the coordinated of b and c and check the coordinate of a. Strength: good check on coordinates closure and bearing closure. Requires: one coordinate point and an azimuth line, or two coordinates. Strength: good check on coordinate closure and bearing closure and distance scale error. Weakness: relies on the being no error in the two known coordinated marks, and two azimuth lines. Requires: two coordinated points, and two azimuth lines, or two coordinated points at each end of the traverse. Required: one coordinated point and an azimuth line, or two coordinated points.
