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How to determine Area of Field using Cross Staff Survey?

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Object: – To determine area of field using cross staff survey.

Equipments:
1. Ranging rod – 7 Nos.
2. 30 m Chain – 1 Nos.
3. Arrow – 5 Nos.
4. Metallic tape (30m) – 1 Nos.
5. Cross staff with stand – 1 Nos.

Procedure: –
1. Field work
2. Classroom work

(1.) Field work
1. First of all first ranging rod is established at point A and makes fixed station taking measurement revising point A to two permanent structures.
2. Second ranging rod is established at point B and for makes fixed station taking measurement revising point B to two permanent structures.
3. Established grid line A to B using ranging procedure by judgment of eye and laying chain on it.
4. Remaining ranging rod established at point P, Q, R, and S, T on right and left side of the grid line and its may be point of permanent structure at different location.
5. Sight point P perpendicular to grid line using cross staff, let’s meeting point is P’ on grid line.
6. Measure distance of AP’ and PP’ by chain (on grid line) and metallic tape (between P to P’).
7. Write all observation in field book or level book immediately.
8. Repeat Sighting procedure using cross staff, let’s meeting point is Q’, R’, S’, and T’ on grid line.
9. Measure distance of AQ’, AR’, AS’ and AT’ by chain (on grid line) and QQ’, RR’, SS’, TT’ using Metallic tape respectively.
10. Write all observation in field book or level book respectively.
11. When complete all observation removes all ranging rods and packed in its cover.

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(2) Classroom work: –
1. Draw a complete figure in field book using field observation.
2. Draw a line meeting point P to S and R to T on field book or level book.
3. Calculate the area of field by subtract out side (remaining) area of meeting line in total area in field book

Observation table: –
Area of Field using Cross Staff Survey

Figure: –
Area of Field using Cross Staff Survey-2

Precautions: –
1. The ranging rod should be established correctly state at all points.
2. The judgment of line should be taking correctly during established ranging rod at a point.
3. Distance between surveyor’s eye and reference station (eg. A, B and C) should be minimum one meter.
4. The cross staff should be states during sight both station and observations take accurately.

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We are thankful to Er. Praveen Kumar Pandey for submitting this very useful topic to us.

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Comments
  • Balweet Singh June 5, 2011 at 3:02 pm

    fully satisfied

  • saurabh foyal July 28, 2011 at 10:00 am

    Why we use concrete hollow block for wall instead of brick

    • Kamran Masood September 5, 2012 at 12:42 pm

      because the concrete hallow blocks have less weight as compared to brick. if they are made in correct proportion and the main properties are hollow bricks are help in proofing from moisture,heat and noise from outside, and the main use of hallow bricks are in tall buildings where more strength is required and less superstructure weight is required.There are some more advantages of hallow bricks but these are enough.

  • PRAVIN RAMESH PAWAR January 7, 2017 at 7:35 am

    EXCELENT FOR STUDENT

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