Atmospheric Correction of Hyperspectral Airborne GCAS Measurements Over the Louisiana Shelf Using a Cloud Shadow Approach

Authors

Minwei Zhang, University of South Florida
Chuanmin Hu, University of South FloridaFollow
Matthew G. Kowalewski, NASA Goddard Space Flight Center, Greenbelt, MD, USAView further author information
Scott J. Janz, NASA Goddard Space Flight Center, Greenbelt, MD, USAView further author information
Zhongping Lee, University of Massachusetts Boston
Jianwei Wei, University of Massachusetts Boston

Document Type

Article

Publication Date

2017

Digital Object Identifier (DOI)

https://doi.org/10.1080/01431161.2017.1280633

Abstract

As an image-driven method to correct for atmospheric effects, the cloud shadow (CS) approach does not require accurate radiometric calibration of the sensor, making it feasible to process remotely sensed data when radiometric calibration may contain non-negligible uncertainties. Using measurements from the Geostationary Coastal and Air Pollution Events Airborne Simulator and from the Moderate Resolution Imaging Spectroradiometer over the Louisiana Shelf, we evaluate the CS approach to airplane measurements in turbid-water environments. The original CS approach somehow produced remote-sensing reflectance (R_rs, sr⁻¹) with an abnormal spectral shape, likely a result of the assumption of identical path radiance for the pair of pixels in and out of the shadow, which is not exactly valid for measurements made from a low-altitude airplane. To overcome this limitation, an empirical scheme using an effective wavelength-dependent radiance reflectance for the cloud (γ, sr⁻¹) was developed and reasonable GCAS R_rs retrievals are then generated, which were further validated against in situ R_rs. Issues and challenges in applying CS to measurements of low-altitude airplanes are discussed.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

International Journal of Remote Sensing, v. 38, issue 4, p. 1162-1179

Scholar Commons Citation

Zhang, Minwei; Hu, Chuanmin; Kowalewski, Matthew G.; Janz, Scott J.; Lee, Zhongping; and Wei, Jianwei, "Atmospheric Correction of Hyperspectral Airborne GCAS Measurements Over the Louisiana Shelf Using a Cloud Shadow Approach" (2017). Marine Science Faculty Publications. 1963.
https://digitalcommons.usf.edu/msc_facpub/1963