Absolute radiometric calibration of the RapidEye multispectral imager using the reflectance-based vicarious calibration method

摘要: RapidEye AG is a commercial provider of geospatial information products and customized solutions derived from Earth observation image data. The source the data constellation consisting five low-earth-orbit imaging satellites. We describe rationale, methods, results reflectance-based vicarious calibration campaign that was conducted between April 2009 May 2010 at Railroad Valley Playa Ivanpah to determine on-orbit radiometric accuracy sensor. In situ surface spectral reflectance measurements known ground targets an assessment atmospheric conditions above sites were taken during spacecraft overpasses. are used as input radiative transfer code compute band-specific top-of-atmosphere radiance. A comparison these predicted values based on absolute physical measured at-sensor radiance provide Initial assessments show sensor response within 8% values. Outcomes this then update parameters in segment processing system. Subsequent verification events confirmed improved 4% predictions method.