Beyond SIR-C/X-SAR

SAR data provide unique information about the health of the planet and its biodiversity, as well as critical data for natural hazards and resource assessments. Based on the success of the Spaceborne Imaging Radar and X-band Synthetic Aperture Radar (SIR-C/X-SAR) missions, an evolving U.S. Flight program leading to long-term environmental monitoring and commercial applications is being developed to meet the needs of the science community and operational and commercial users. Requirements have been collected from a variety of sources, both nationally and internationally. The Committee on Earth Studies of the National Research Council Space Studies Board has provided recommendations on science priorities. An Interagency ad hoc working group on SAR has established requirements for the U.S. Operational user community, and an International SAR Working Group has the task of recommending an integrated approach to global SAR observations. Implementation approaches have been developed that focus on cost-effective means to meet these needs. Fundamental to the resulting program are the acquisition of a globally consistent digital topographic data base, continuity of calibrated multiparameter SAR data, support for airborne SAR campaigns, and infusion of new technology. In addition, international outreach programs have been initiated to increase the user base for SAR data. Mission concepts included in this scenario are a Shuttle Radar Topography Mapper (SRTM), a LightSAR Technology validation mission, and an International SAR (ISAR) constellation.