TENDER DOCUMENT FOR THE ACQUISITION OF AERIAL PHOTOGRAPHS AND MAPPING OF AN AREA

SURCON QUESTION: PREPARE A TENDER DOCUMENT WHICH COULD PREFERABLY BE IN TERMS OF BILLS OF QUANTITIES FOR THE ACQUISITION OF AERIAL PHOTOGRAPHS AND MAPPING OF AN AREA ABOUT 900KM² IN AJAOKUTA. MAP SCALE = 1:2,000. CONTOUR INTERVAL = 2M.

Introduction

The project area of 900km² could be taken as approximately 30km and 30km. second-order controls approximately apart shall be established throughout the project area. Thus, 100 of such controls shall be pre-marked in the project area.

Number of Photographs

Number of photographs to be produced can be calculated thus:

At average photo scale of 1:2000, ground area covered by each photograph would be 15m by 15m.

Using standard format photo size of 230mm x 230mm, of which 60% is overlapped, the new ground covered at this scale by each photo is 40% of 230mm = 92mm

Therefore, the number of photo per strip = 15,000mm ÷ 92mm = 164, plus say 2 at each end to ensure coverage, totaling 168 photos.

Likewise, for 30% lateral overlap the number of strips = 15,000 ÷ (70% of 230mm) = 94

Total number of photographs = 168 x 94 = 15,792

Number of Map Sheets

Map sheet is A1, that is, 520mm x 580mm.

Number of sheets = (15,000 ÷ 520) x (15,000 ÷ 580) = 29 x 26 = 754

Bill of Quantities

The bill of quantities is tabulated below:

Conclusion

The bill of quantities presented above was prepared so that the project could be concluded within a period of three months.

DISCLAIMER: This material is only an attempt to answer an examination question, though written from a background of solid knowledge and practical experience in Surveying and Geoinformatics. It has not gone through peer review. Therefore, all views and opinions expressed therein remain the responsibility of the author and do not necessarily represent that of any institution.  Feedback on corrections and constructive criticisms are welcome. Thank you.