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# 3 maps & plane table surveying. plane table surveying

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This PowerPoint gives information about steps involved in Plane table surveying and methods of plotting....!

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• Radiation:Select appoint p so that all point to be located are visible from it. Set up the table at p and leveled.Marked the direction of magnetic meridian with through compass in top corner of sheet.Select the point p on the sheet so that it is exactly over station p on the ground.Centering the Alidades on p, sight the various points A, B, C etc. and draw the rays along edge of Alidades.Measure the distance PA, PB, PC etc. from p to various point with chain or tape and plot them to scale along the co responding rays. Join the points a, b, c, etc. to give outline of survey.
• Radiation:Select appoint p so that all point to be located are visible from it. Set up the table at p and leveled.Marked the direction of magnetic meridian with through compass in top corner of sheet.Select the point p on the sheet so that it is exactly over station p on the ground.Centering the Alidades on p, sight the various points A, B, C etc. and draw the rays along edge of Alidades.Measure the distance PA, PB, PC etc. from p to various point with chain or tape and plot them to scale along the co responding rays. Join the points a, b, c, etc. to give outline of survey.
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• http://www.slideshare.net/Azil14/plane-table-in-surveying
• ### 3 maps & plane table surveying. plane table surveying

1. 1. These are the steps you must follow in order to carry out an accurate plane table survey:1. Chose a location where you can see all other points of interest2. 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 possible4. Put on drawing board and ensure level5. Secure drawing sheet to the drawing board6. Pivot drawing board so that the top of the sheet is aligned with and north and mark on7. 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. This PowerPoint Presentation is developed and created by :
2. 2. Methods of PlottingRadiation B C P Chose a point that you can A see all required positions
3. 3. Methods of PlottingRadiation B C P Chose a point that you can A see all required positions
4. 4. Methods of PlottingRadiation B C P Chose a point that you can A see all required positions
5. 5. Methods of PlottingRadiation B C P Chose a point that you can A see all required positions
6. 6. Methods of PlottingRadiation B C P Chose a point that you can A see all required positions
7. 7. Methods of PlottingRadiation B A Measure with a tape C P 70m Chose a point that you can A see all required positions
8. 8. NMethods of PlottingRadiation B A Measure with a tape C P 70m Chose a point that you can A see all required positions
9. 9. NMethods of PlottingRadiation 7cm B A A Measure with a tape C P 70m Chose a point that you can A see all required positions
10. 10. NMethods of PlottingRadiation 7cm B A A Measure with a tape C 70m A
11. 11. N 5cmMethods of B PlottingRadiation 7cm B A 50m A Measure with a tape C 70m A
12. 12. N 5cm Methods of B Plotting4cm Radiation C 7cm B A 50m A 40m Measure with a tape C 70m A
13. 13. Methods of Plotting N B 5cm Radiation C P 4cm 7cm A 1:1000 A
14. 14. Methods of Plotting N B Radiation C P A 1:1000 A
15. 15. What could we use this mapfor?A farmer wants to know how big his field is sohe knows how much seed to buy.1 bag of seed will cover 0.5m2How will he work out how many bags of seedhe will need?You must find the area of the field from the scale drawingConvert it using the scale into the real life areaDivide this area by the area 1 bag of seed will cover
16. 16. What could we use this mapfor?The area of a square is hxb NThe area of a triangle canbe found by 0.5xhxb B Radiation C P 9x8 = 72 =36 cm2 2 2 A 1:1000 A
17. 17. What could we use this mapfor? N B Radiation C P A 1:1000
18. 18. What could we use this map for? As the scale is 1:1000 36 cm2 on the map=36cm2 x 1000 in real life N So in real life the area is 36000cm2 Or 3.6m2 B RadiationSo as 1 bag of seed will cover 0.5m2 C P We will need 3.6m2 = 7.2 bags of seed 0.5m2 So the farmer will need to buy 8 bags of A seed to cover his field. 1:1000
19. 19. Other examples of RadialPlotting