The basis of the SAPOS® - services is a network of global-positioning system reference stations. This network records the satellites' signals and provides correction data to its customers to allow for position fixing and navigation to an accuracy level of a few centimetres or less.
SAPOS® - services is a joint project of the Surveying Authorities of the States of the Federal Republic of Germany.
The Global Positioning System (GPS) enables its users to calculate their position (Latitude, Longitude and Height) anywhere in the world with an estimated accuracy of 10 metres.
A higher level of accuracy can be obtained by relative observations with two simultaneously operated GPS receivers.
SAPOS® represents a major advance in the technical evolution of land surveying. Whether for terrestrial or aerial surveys, for centimetre or millimetre accuracy, the SAPOS® - services for real-time position fixing and for postprocessing meet all needs. Connection to the future official spatial reference system, ETRS 89, is simply, quickly and efficiently achieved, independent of monumented local control points. With the Berlin State software products for transformation of plan coordinates and heights, the results can be precisely transformed into the still-valid Soldner-Berlin plane coordinate system and into the uniform nationwide DHHN 92 height reference system.
SAPOS® will not be able to replace entirely the terrestrial measurement procedures for detail surveys. However the economic and technical advantages will lead to ever wider use of this modern technique.