1.Chose a location where you can see all other points of interest 2.Pace out the area so that you get a feel for what kind of scale you may use. 3.Set.

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1.Chose a location where you can see all other points of interest 2.Pace out the area so that you get a feel for what kind of scale you may use. 3.Set up tripod over this location and get as level as possible 4.Put on drawing board and ensure level 5.Secure drawing sheet to the drawing board 6.Pivot drawing board so that the top of the sheet is aligned with and north and mark on 7.Mark central point of drawing sheet and apply the plumb line. 8.Place the alidade on the drawing board with the end with the narrow slit towards your eye and align it so that the rule touches the central point. 9.Draw a line along the rule in the direction of this point. 10.Measure the distance from the plumb line to the point of interest. Use a suitable scale to mark on this distance on your drawing sheet. These are the steps you must follow in order to carry out an accurate plane table survey:

Radiation B C A P Chose a point that you can see all required positions

Radiation B C A P Chose a point that you can see all required positions Measure with a tape A N 7cm A70m

Radiation B C A Measure with a tape A 70m N 7cm A

Radiation B C A Measure with a tape A 70m 50m B 5cm N 7cm A

Radiation B C A Measure with a tape A 70m 50m B 5cm N 7cm A 40m 4cm C

Radiation A B 5cm N 7cm A 4cm C P 1:1000

Radiation A B N A C P 1:1000

A farmer wants to know how big his field is so he knows how much seed to buy. How will he work out how many bags of seed he will need? You must find the area of the field from the scale drawing Convert it using the scale into the real life area Divide this area by the area 1 bag of seed will cover 1 bag of seed will cover 0.5m 2

Radiation A B N A C P 1:1000 The area of a triangle can be found by 0.5xhxb h=9cm b=8cm The area of a square is hxb 9x8 = 72 =36 cm 2 2 2

Radiation B N A C P 1:1000 As the scale is 1: cm 2 on the map=36cm 2 x 1000 in real life So in real life the area is 36000cm 2 Or 3.6m 2 So as 1 bag of seed will cover 0.5m 2 We will need 3.6m 2 = 7.2 bags of seed 0.5m 2 So the farmer will need to buy 8 bags of seed to cover his field.