Topographic Survey

Data Services  Land Survey 

The requirements for small and medium scale topographic survey are not as stringent as those for geodetic survey. However, convenience and speed of operation are crucial.

Our solution here is to use a satellite based differential system (DGPS). This works in conjunction with a reference signal transmitted in the L1 microwave band. The choice of L1 is a compromise between precision and ionospheric disturbance.

The use of a DGPS provides suitable precision, but without the logistical restrictions of true differential operation.

Our chosen equipment is the LandStar DGPS from Racal which provides sub-metre RTCM accuracy.


For further information, please contact Geo Strategies at:
Geo Strategies Ltd           Geo Strategies SA
St John's Innovation Centre Str G-ral V. Milea, 10A
Cowley Road Sibiu 550331
Cambridge  CB4 0WS Romania
United Kingdom
Tel: +44 (0)1223 205080 Tel:   +40 (0)269 210832
Fax: +44 (0)1223 205081 Fax:   +40 (0)269 211165
Email: Email:

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January 2004