The development of stress-tolerant crops has been hindered by limited knowledge of more precise physiological parameters that reflect genetic potential for improved productivity.  The primary limiting factors are our ability to monitor physiological and agronomic parameters on a field scale at fine temporal and spatial intervals. Recent developments in remote sensing technology, data management, and engineering make real-time crop monitoring and management possible and allow for more accurate phenotypic characterization of germplasm.  This symposium will focus on new approaches and issues related to field-scale phenotyping and germplasm evaluation for improved crop production.