SURVEY METHODOLOGY

Methodology

GPS survey

The global positioning (GPS) is a satellite based positioning system operated and controlled by the US Department of Defense by using NAVSTAR satellites (SVs) in space. The US department of Defense Controls the system by using four ground based monitor stations, a master and three up loaded stations. GPS Surveying Requires the simultaneous observation of the same four satellites by at least two GPS receivers.

NAVSTAR SateliteThe Base receiver is located over a known control point for the duration of the survey .The rover receiver is moved to the points that are to be surveyed or stacked out. When the data from these two receivers is combined; the result is a three –dimensional vector between the base and rover.

There are Real-Time techniques & post proceed techniques are used to determine the position of the receiver relative to the base.


Total Station Survey

This is the most common survey used now days with electronic distance measurement system. A total station allows the surveyor to store all information he needs to establish a setting out and can store all information taken from site as existing features , original ground levels ,road edges , etc.

Also the remote measurements are facilitated by the total station where a direct access is not available. For example the height of street light poles, ground clearance of overhead power lines. Etc.


Dumpy levels survey

Dumpy level survey is carried out to determine the vertical reference with the mean sea level or available approved datum precisely .with different survey method the elevation of any required point or area is calculated to a millimeter.


DETAILS OF GLOBAL POSITIONING SYSTEM (GPS)

SNO DESCRIPTION MODEL OF GPS QTY (NOS)
1 LEICA VIVA GS 12 2
2 LEICA VIVA GS 08 2
3 LEICA VIVA GS 14 2
4 LEICA VIVA GS 15 2
5 LEICA VIVA GS 10 6
6 LEICA VIVA GS 25 6
7 TRIMPLE R10 2
8 TRIMPLE R8S 2
9 TRIMPLE R4 2

DETAILS OF TOTAL STATION INSTRUMENTS

SNO TOTAL STATION MODEL OF TOTAL STATION QTY ACCURACY
1 LASER STATIONS TPS 6000 5
2 LASER STATIONS TDRA 6000 5
3 LEICA VIVA TS 11 5
4 LEICA VIVA TS 16 6
5 LEICA NOVA TS 60 6
6 LEICA NOVA TM 50 4
7 LEICA NOVA MS 60 4
8 Leica 1201 5
9 Leica 1202 5
10 LEICA iCON 60 4
11 TRIMPLE S9 4
12 TRIMPLE S7 4
13 TRIMPLE S5 3

DETAILS OF DUMPY LEVEL INSTRUMENTS

SNO LEVEL INSTRUMENTS MODEL OF INSTRUMENTS QTY
1 TOPCON AT G6 8
2 LIECA NA 724 6
3 LIECA 200M 8
4 NIKON AC 2S 4
5 LIECA DIGITAL 5
6 LEICA NA2 / NAK2 5
7 Leica sprinter 50 6
8 Leica Sprinter 150(M) / 250M 5
9 Leica DNA03 / DNA10 5
10 Leica Jogger Series 6
11 Leica Runner 20 / 24 4
12 Leica NA 700 Series 4
13 Trimble DiNi 03 2
14 Trimble DiNi 0.3mm 2