Total station for Accurate Surveying..
Total station is a surveying equipment combination of Electromagnetic Distance Measuring Instrument and electronic theodolite . It is also integrated with microprocessor, electronic data collector and storage system . The instrument can be used to measure horizontal and vertical angles as well as sloping distance of object to the instrument..
Use of Total Station :
The total station instrument is mounted on a tripod and is levelled by operating levelling screws. Within a small range instrument is capable of adjusting itself to the level position. Then vertical and horizontal reference directions are indexed using onboard keys. It is possible to set required units for distance, temperature and pressure . Surveyor can select measurement mode like fine, coarse, single or repeated.
When target is sighted, horizontal and vertical angles as well as sloping distances are measured and by pressing appropriate keys they are recorded along with point number. Heights of instrument and targets can be keyed in after measuring them with tapes. Then processor computes various information about the point and displays on screen.
This information is also stored in the electronic notebook. At the end of the day or whenever electronic note book is full, the information stored is downloaded to computers.
The point data downloaded to the computer can be used for further processing. There are software like auto civil and auto plotter clubbed with AutoCad which can be used for plotting contours at any specified interval and for plotting cross-section along any specified line.
Field work is carried out very fast .
Accuracy of measurement is high .
Manual errors involved in reading and recording are eliminated .
Calculation of coordinates is very fast and accurate. Even corrections for temperature and pressure are automatically made .
Computers can be employed for map making and plotting contour and cross-sections. Contour intervals and scales can be changed in no time .