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The paper reports on the principles, experiences and first results made with a low cost satellite based sensor network recently developed especially for landslide monitoring. Central idea of the system is the permanent broadcast of carrier phase (CP) raw data from the sensor nodes to a base station, where an automated near real time processing (NRTP) takes place. Low cost means the utilization of simple navigation receivers with the required capability of read-out the CP raw data. Depending on the di¤erent filter options during analysis the system generates sensor node positions with sub centimetre accuracy. The challenge of the still ongoing development is to have a flexible, robust (weatherproof ), commercial o¤-the-shelf GNSS sensor network of high-quality available -concerned not only for landslide monitoring in future.

Mainly in the context of global climate change the awareness of landslide hazards has risen considerably in most mountainous regions worldwide in the last years. National and regional hazard mapping programs were set up in many countries and most of the potentially endangered sites have been identified. Although exclusive geodetic and geotechnical instrumentation is available today, due to some economical reasons only few of the identified potentially risky landslides are monitored permanently. The intention of the alpEWAS research project is to develop and to test new techniques suitable for e‰cient and cost-e¤ective landslide monitoring. These techniques are combined in a geo sensor network with an enclosed geo data base and a developed software package to use the whole system for stakeholder information and early warning purposes. The core of the project is the development and testing of the three innovative measurement systems time domain reflectometry (TDR) for the detection of subsurface displacements in boreholes and reflectorless video tacheometry (VTPS) and a low cost GNSS sensor component for the determination of 3D surface movements. Essential experiences obtained during the project will be described.

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