Self-assessments for: Datums and network design

These self-assessment problems accompany the mini course On Datums and Network Design.

Problem 1

In the network shown below:

a) If you were to remove only the distance measurements from the adjustment, would you have a datum problem? If so, what is / are the defect(s)?

b) If you were to remove only the known coordinates of point 1, would you have a datum problem? If so, what is / are the defect(s)?

c) If you were to remove both known points (1 and 2), would you have a datum problem? If so, what is / are the defect(s)?

Problem 2

Which of following is more likely to have been solved by internal constraints and (vs. external constraints)? Why?

a)

b)

Problem 3

If the following correction vectors correspond to different adjustment solutions of a two-station height network, which is a solution by inner constraints and why?

a)

    \begin{equation*} \hat{\boldsymbol{\delta}} = \begin{bmatrix} 0.010 \\ 0.000 \end{bmatrix} \end{equation*}

a)

    \begin{equation*} \hat{\boldsymbol{\delta}} = \begin{bmatrix} -0.005 \\ 0.005 \end{bmatrix} \end{equation*}

The following schedules are for Alex’s in-class students:

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