In 1993 the geodetic control network of Sri Lanka was upgraded by using precise baselines meassured using global positioning system. The transformation parameter were computed from the local datum called Everest 1830 to global datum called WGS84. Hence Global Positioning System receivers can be used to obtain the national grid system centimeter level accuracy.
Sri Lanka Continuously Operating Reference Station Network (SLCORSnet) comprises of physical GNSS reference stations at remote designated locations that transmit the collected GNSS raw data live to the Control Centre based in Colombo at the Survey Generals Office. This raw data is processed using a GNSS network processing software housed at the Control Centre which then will be transmitted to the users in the field over the internet based on their geographic location in the form of RTCM corrections. Online delivery of RINEX raw data and online post-processing services are provided as real-time web services from the SLCORSnet. Once, registered under SLCORSnet and once you have purchased these services, you are allowed to use these services freely during the subscription period.
Issue of Geodetic Information to Licensed Surveyors and Outside the Department
Following type of geodetic information will be issued from the Geodetic Survey Units at SGO, Colombo & ISM, Diyatalawa, at the rates given below.
Type of Information | Rate (Rs.) | Collection possible from |
---|---|---|
BM height with the diagram | 260.00 | SGO/ISM |
Coordinates of 1ndorder and 2nd order EDM traverse control points with diagrams | 260.00 | SGO/ISM |
Coordinates of a GPS primary control point with diagrams | 500.00 | SGO/ISM |
Coordinates of Trigonometrical station with observed bearings and descriptions | 320.00 | ISM |
GNSS data from SLCORSnet 1 Day (24 Hours) | 2,000.00 | SGO |
GNSS data from SLCORSnet 7 Days (1 week) | 10,000 | SGO |
GNSS data from SLCORSnet 30 Days (1 Month) | 30,000 | SGO |
GNSS data from SLCORSnet 365 Days (1 Year) | 360,000.00 | SGO |
Base data of SLCORSnet 6.00 am – 6.00 pm per station per day | 600.00 | SGO |
Note:- All applicable tax to be added to above rates
Certification of GNSS Tertiary level Control Points, Traverse Control Points& Level lines (BM) done by Private Sector Surveyors.
Other services are available in Geodetic Survey Unit.