Advanced methods in measuring by GPS, differential (DGPS) and real-time kinematic (RTK) surveying. Determination methods and techniques for searching ambiguities (least square method, variance-covariance, FASF, Lambda method, etc) for both phase and the combination of code and phase data. Plans for developing GPS and the advantages provided by the new possibilities in the sensor integration and geomatics. Basic principles and prerequisites for sensor integration, advantages following the integration. Sensor characteristics applied in the integration for geodesic and geoinformation purposes (GPS, inertial systems, remote detection sensors, odometers and gyroscopes). Algorithms for sensor integration. Integration of GPS and GIS. Integration of sensors for non-geodesic purposes. Geomatic approach to sensor integration, definition of the integrated sensor space, problems in data acquisition and quality.