Considerations Concerning Geodetical Long-Term Monitoring Tasks

When Geodetic Monitoring has to be realized over a period of almost 20 years, a couple of difficulties have to be mastered which shall be demonstrated on the basis of an exemplary case: a potential landslide area at the alpine mountain Hornbergl in the Tyrolean Lech Valley. Since the observation of the first epoch in 1987 the monitoring task’s constraints have changed twice in a fundamental way, caused by technological progress. At first the transition from terrestrial to satellite-supported measurement had to be conquered; now we ought to benefit from current opportunities of continuous observation methods and of providing the necessary independent power supply to gain detailed insight into the motion’s kinematics. Severe difficulties also arise with the need to adapt evaluation and analysis processes to overcome loss of reference points, new datum transformations and time scale modifications. Hybrid analyses create additional obstacles, if useful nongeodetic information, e.g. from photogrammetry and remote sensing, or relative movements from geotechnical observations should be taken into account for a general judgement of the hazard situation.     «

When Geodetic Monitoring has to be realized over a period of almost 20 years, a couple of difficulties have to be mastered which shall be demonstrated on the basis of an exemplary case: a potential landslide area at the alpine mountain Hornbergl in the Tyrolean Lech Valley. Since the observation of the first epoch in 1987 the monitoring task’s constraints have changed twice in a fundamental way, caused by technological progress. At first the transition from terrestrial to satellite-supported mea...     »