(a) Describe, with the aid of a suitable diagram, an open traverse
(b) A compass traverse round a school compound produced the following field record:
| Line | Length (mm) | Bearing |
| AB | 370 | 260º |
| BC | 450 | 198° |
| CD | 265 | 110° |
| DE | 560 | 35° |
| EA | 140 | 330° |
Use the data above to:
(i) plot the area of the compound on a scale of 1cm to 50m
(ii) find the direct distance between D and A, in metres.
Explanation
(a) A transverse is a series of connected straight lines whose lengths and bearings are measured. An open transverse starts from one end oF a particular road or path to another (See diagram below). It is transverse, i.e. straight line that doesn’t close at the point of origin.
| Line | Length (mm) | Length (cm) | Bearing |
| AB | 370m | 7.4cm | |
| BC | 450m | 6.5cm | |
| CD | 265m | 5.3cm | |
| DE | 560m | 11.0cm | |
| EA | 140m | 2.8cm |
Use the data above to: (i) plot the area of the compound on a scale of 1 cm to 50m.
(ii) find the direct distance between D and A, in metres = 12.6cm. Scale = lcm to 50m (1:5,000) 12.7cm = 12.7 x 50 = 635m
Scale: 1:5000 (1cm to 50m)