Vicarious Calibration of the Hyperspectral Imager for Coastal Oceans (HICO) Using MOBY and AERONET-OC Data

• Main Authors: Lewis, David, Gould, Jr, Richard W, Ladner, Sherwin D, Lawson, Timothy A, Martinolich, Paul
• Format: Report
• Language: English
• Subjects: AERONET; Atomic and Molecular Physics and Spectroscopy; CALIBRATION; COASTAL REGIONS; HICO(HYPERSPECTRAL IMAGER FOR COASTAL OCEANS); HYPERSPECTRAL IMAGERY; MOBY(MARINE OPTICAL BUOY); OCEAN COLOR; OCEANS; Optical Detection and Detectors; OPTICAL DETECTORS; PE0602435N; Physical and Dynamic Oceanography; SATELLITE IMAGERY; VICARIOUS CALIBRATION; WU73-6552-02-5

The Hyperspectral Imager for Coastal Oceans (HICO) was constructed and is managed by the US Naval Research Laboratory (NRL). Pre-launch calibration, and therefore sensor measurement accuracy, of satellite sensors can be affected by launch vibrations, temperature fluctuations, space radiation and other factors. Vicarious correction was applied to HICO imagery to improve measurement accuracy. Vicarious calibration applies a reverse atmospheric correction where satellite-derived atmospheric factors are added to in situ normalized-water-leaving radiances to generate vicarious top-of-atmosphere radiances that are used to compute gain and offset values. The gains and offsets are subsequently applied to satellite sensor top-of-atmosphere radiances to force closer agreement with in situ measurements. In situ data from the Marine Optical Buoy (MOBY) and from some of the NASA AErosol RObotic NET Ocean Color (AEONET-OC) platforms were used to provide in situ water measurements used to vicariously calibrate HICO data. Presented at Ocean Optics XXI, Glasgow, Scotland, 8-12 October, 2012.