Ziggy-Hyperion Reprocessing

To prepare the scientific community for globally sampled visible through shortwave infrared (VSWIR) spectra that are representative of data types and volumes for the upcoming Earth System Observatory’s Surface, Biology and Geology (SBG) mission, we process the Hyperion 17-year mission archive using Ziggy. To identify and reduce risks, NASA has funded this activity which will enable evaluations that significantly increase the prospects for major scientific discovery in the early post-launch period. The Space-based Imaging Spectroscopy and Thermal pathfindER (SISTER) study seeks to adapt and refine existing workflows and architectures as a prototype for the SBG science data system. 

SISTER is a collaboration between JPL, Ames, and Goddard NASA centers. The first stage of processing in Ziggy has been fully implemented, from the raw data (Level 0) to top-of-the-atmosphere radiance (Level 1) as the entire 55 TB Hyperion data set is reprocessed. Atmospheric correction has been applied and evaluated using the JPL ISOFIT software. Applying georectification by introducing the best available ground control and resampling modules will produce the complete L1B and L2 Hyperion datasets. We are currently implementing georectification in the pipeline by including an a priori guess of image location obtained from satellite position and camera information which is then matched with Landsat data. Future tasks include processing L3 data that are scientific modules of lower-level processed data like periodic summaries (weekly, monthly) of L2 products. Our data set is fully integrated with an operational data processing pipeline and provides a testbed for science algorithm modules and for investigating the scalability of data processing to full-volume SBG datasets.