# Transverse survey - PowerPoint PPT Presentation

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E. D. A. B. C. Transverse survey. Transverse 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, .

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Transverse survey

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E

D

A

B

C

### Transverse survey

Transverse 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=47

### Field 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.

J

H

### Example 1

a) Complete a field diagram for this field

40

K

28

30

22

15

I

L

20

14

b) Calculate the area of this field.

A1 = ½bh

= ½ × 20 × 14

= 140

A3 = ½ × 28 × 10

= 140

ATOT = 140+384+140+300

= 964u2

A2 = ½(a + b)h

= ½ × (20 + 28) × 16

= 384

A4 = ½ × 40 × 15

= 300

94

D

79

39

C

47

35

B

E

29

27

A

### Example 2

Sketch the field represented by this field diagram.

D

15

39

C

• You may also be asked to:

• Make a scale drawing of the field

• Find lengths such as AB or BC.

32

35

B

29

20

E

27

A

### Today’s work

Field Diagrams Worksheet

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