On the Accuray and Performance of the Geomòbil System

The GEOMÒBIL is a Land Based Mobile Mapping System (LBMMS) developed by the ICC. It is a modular system that allows the direct orientation of any sensor mounted on a roof platform. The GEOMÒBIL system is composed of the following subsystems: orientation subsystem, image subsystem, laser ranging subsystem, synchronization subsystem, power and environmental control subsystem and data extraction software subsystem. After a brief description of the GEOMÒBIL system, the paper focuses on the calibration and performance of the GEOMÒBIL image subsystem. It describes the calibration of the CCD (Coupled-Charged Device), cameras used (camera calibration) and the calibration of the boresight parameters (eccentricity and misalignment of the image sensors with reference to the GPS/IMU reference frame). The accuracy and stability of the boresight camera calibration are also discussed. In order to evaluate the accuracy and performance of the system, several missions have been carried out under different configurations and environments. An operator has measured elements in the images by using data extraction software developed by the ICC as part of the GEOMÒBIL system. The results of the campaigns in terms of the accuracy and performance of the GEOMÒBIL are discussed and conclusions are drawn. Finally, the paper gives a brief description of the future developments related to the integration of new sensors into the GEOMÒBIL platform. In particular, a terrestrial laser scanner has recently been installed and the first results are presented.