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.
Issue of Geodetic Information to Licensed Surveyors and Outside the Department
Following type of geodetic information will be issued only from the Geodetic Survey Unit, ISM, Diyatalawa, at the rates given below.
(a) Bench mark information of primary and Secondary level lines. Only the ‘C” type bench mark will be issued unless the survey is supervised by the dept.
(b) All triangulation points, coordinates and route sketches.
(c) GPS Primary Control points, coordinates and sketches.
(d) First Order traverse control point, coordinates and sketches.
(e) GPS data.
|Type of Information
|BM height with the diagram
|Coordinates of 1ndorder and 2nd order EDM traverse control points with diagrams
Coordinates of a GPS primary control point with diagrams
Coordinates of Trigonometrical station with observed bearings and descriptions
Note:- All applicable tax to be added to above rates
Other services are available in Geodetic Survey Unit.
1. Calibration of Total station instrument. Rs 2500 + all applicable tax to be added.
2. Consultancy Services
3.Establishing of (GPS) control points.