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In many monitoring applications, such as tall buildings, bridges and volcanoes,<br>GNSS offers significant advantages over other measurement techniques. GNSS allows<br>a high rate of measurement and long distances between the control and monitoring<br>points and does not require line of sight to the control points.<br>The traditional dual-frequency GNSS receivers used in surveying are high accuracy<br>but also relatively high cost per monitored point and therefore often prohibitive<br>for the deployment of a GNSS monitoring network.<br>Until recently, cost effective L1 sensors and software have not been able to provide<br>the necessary level of accuracy and reliability. A new solution from Leica Geosystems<br>provides real time and post processed RTK positioning with L1 only GNSS<br>receivers for monitoring applications.