Processing for Firefly images

The image processing workflow consists of four major steps - radiometric correction, geometric correction, atmospheric correction, and quality analysis. Before radiometric correction, the raw data downlinked from the satellite is converted to an L0 level for long-term storage. The L0 level data is then used for radiometric correction, where DN numbers are converted to radiance and basic striping and high-frequency noises are removed from the data. This data is called L1A. Post L1A, a geometric correction model is applied to georeference, orthorectify the data, and store it as level L1B. L1B data is used by Pixxel’s internal atmospheric correction model and is converted to TOA reflectance L1C and BOA reflectance L2A data sequentially. Upon completion, a quality analysis and quality check are performed on each image, observations are recorded, and data is stored for delivery.