Diurnal Changes of Remote Sensing Reflectance Over Chesapeake Bay: Observations from the Airborne Compact Atmospheric Mapper

Authors

Minwei Zhang, University of South Florida
Chuanmin Hu, University of South FloridaFollow
Jennifer Cannizzaro, University of South FloridaFollow
Matthew G. Kowalewski, Universities Space Research Association, Columbia, MD 21046, USA
Scott J. Janz, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

Document Type

Article

Publication Date

2018

Keywords

Airborne, Diurnal changes, ACAM, Atmospheric correction, Chesapeake bay

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.ecss.2017.10.021

Abstract

Using hyperspectral data collected by the Airborne Compact Atmospheric Mapper (ACAM) and a shipborne radiometer in Chesapeake Bay in July–August 2011, this study investigates diurnal changes of surface remote sensing reflectance (R_rs). Atmospheric correction of ACAM data is performed using the traditional “black pixel” approach through radiative transfer based look-up-tables (LUTs) with non-zero R_rs in the near-infrared (NIR) accounted for by iterations. The ACAM-derived R_rs was firstly evaluated through comparison with R_rs derived from the Moderate Resolution Imaging Spectroradiometer satellite measurements, and then validated against in situ R_rs using a time window of ±1 h or ±3 h. Results suggest that the uncertainties in ACAM-derived R_rs are generally comparable to those from MODIS satellite measurements over coastal waters, and therefore may be used to assess whether R_rs diurnal changes observed by ACAM are realistic (i.e., with changes > 2 × uncertainties). Diurnal changes observed by repeated ACAM measurements reaches up to 66.8% depending on wavelength and location and are consistent with those from the repeated in situ R_rs measurements. These findings suggest that once airborne data are processed using proper algorithms and validated using in situ data, they are suitable for assessing diurnal changes in moderately turbid estuaries such as Chesapeake Bay. The findings also support future geostationary satellite missions that are particularly useful to assess short-term changes.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Estuarine, Coastal and Shelf Science, v. 200, p. 181-193

Scholar Commons Citation

Zhang, Minwei; Hu, Chuanmin; Cannizzaro, Jennifer; Kowalewski, Matthew G.; and Janz, Scott J., "Diurnal Changes of Remote Sensing Reflectance Over Chesapeake Bay: Observations from the Airborne Compact Atmospheric Mapper" (2018). Marine Science Faculty Publications. 1980.
https://digitalcommons.usf.edu/msc_facpub/1980