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## PowerPoint Slideshow about 'Transverse survey' - krikor

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Transverse surveyTransverse or offset surveys are used to find the area of irregular shapes, such as the field ABCDE to the right.

- In this method the surveyor:
- walks along a straight line (eg AD),
- the transverse line,
- often a diagonal of the area to be surveyed,

- measuring distances along this line and
- distances to major features, or offsets, when they are at RIGHT ANGLES to the transverse line.
- For example…

Transverse survey

- To survey the field ABCDE:
- Choose any suitable diagonal, ie AD
- Measure the lengths along the transverse line, ie AP, PQ, QR and RD.
- Measure the lengths of the offsets, ie BQ, CR and EP.

20+27=47Field diagrams

When in the field doing the survey the surveyor sketches the information as a field diagram.

- To complete a field diagram:
- Start at one end of the transverse line
- Write down the cumulative distances of the offsets from the starting point

- Write down the lengths of the offsets, on the left or right, as appropriate.
- Units are not shown.

Field Diagram Task

- On the oval there are two‘irregular fields’ marked with different coloured cones.
- Use the trundle wheels/tape measures and set squares to measure the offsets for the two irregular fields.
- Create a notebook entry for the two irregular fields.
- Sketch the two fields, showing all the appropriate measurements.
- Calculate the area & perimeter of both fields.

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