18-12-2012, 06:51 PM
LATEST TECHNIQUES IN SURVEYING WITH TOTAL STATION IN JALAYAGNAM
1LATEST TECHNIQUES.ppt (Size: 1.24 MB / Downloads: 79)
What is Survey?
It is Process of determining
earthen features and recording
its relative position on to the paper
Types of survey
Traverse survey
Triangulation survey
Plane table survey
Which includes:
1. Linear Measurements
2. Angular Measurements
3. Height Measurements
Basic components of Total station
Prism reflector:
It is a combination of ranging rod, staff and and
optical cuboidal mirror.
having 2/3 lifts with 5cms interval graduations.
adjustable height from 1.5m to 3.75m.
More number of prisms, will give more accuracy.
Operations involved while using Total Stations :
Establishing the site Datum:
a) Selecting the site Datum
b) Establishing North
2. Setting up the Total station:
a) Placing and leveling Tripod on Datum
b) Placing and leveling the Gun on Tripod
c) Linking the data connector to Gun
3. Data collector options and setting
a) Main menu
b) Basic settings
SAFETY PRECAUTIONS
Focusing directly at the sun, can result - loss of eyesight on the spot. Use a filter when observing the sun.
Never remove the hand grip carelessly. If the grip is loosely or incompletely attached, the instrument could fall and may cause a serious injury.
Make sure not to short the battery terminals. If these are shorted, the resulting high current would not only damage to the battery, but also start a fire.
If the instrument or battery comes in contact with water, wipe it off as quickly as possible and set it in a dry place for a while. When it is completely dry, put it back in the case.
Never disassemble the instrument, if you find a problem. Contact the dealer.
HOW TO SUPERVISE THE TOTAL STATION WORK
Have keen observation on the prism boy’s attitude. When high precision is required, use the prism tripod, to avoid human error.
The position of prism shall always be on hard surface instead of soft soil.
Focusing shall be exactly at the centre of prism, with the help of cross hairs and prism plate.
While measuring the instrument height and prism height, enough attention shall be diverted. Also, have keen observation while entering the above data.
Note the location and coordinates of station point and back sight so that specified intermediate points can be checked at later date.
Obtain a soft copy of field work raw data from the survey agency so that the results can be checked at any time.
Obtain more number of points to get an average.