Updated Results of Calibration and Validation of Alos Optical Sensors

The Advanced Land Observing Satellite (ALOS, nicknamed "Daichi") was successfully launched on January 24, 2006 and it continuously working very well. This paper introduces the updated results of calibration for two optical sensors of ALOS i.e. the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) and the Advanced Visible and Near Infrared Radiometer type-2 (AVNIR-2). PRISM consists of three panchromatic radiometers, and is using to derive a digital surface model (DSM) that is topography and terrain height information with high spatial resolution. Therefore, geometric calibration is important in generating a highly accurate DSM by stereo pair image of PRISM. The radiometric calibration is also important for PRISM as well as AVNIR-2. This paper describes the updated results of geometric and radiometric calibrations and image quality evaluation of PRISM and AVNIR-2 in the operational phase, which are including stability or time trend of accuracies during 2.5 years since launch the ALOS.