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

Minwei Zhang; Chuanmin Hu; Jennifer Cannizzaro; Matthew G. Kowalewski; Scott J. Janz

doi:10.1016/j.ecss.2017.10.021

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

Minwei Zhang, Chuanmin Hu, Jennifer Cannizzaro, Matthew G. Kowalewski, Scott J. Janz

College of Marine Science

Research output: Contribution to journal › Article › peer-review

Abstract

Using hyperspectral data collected by the Airborne Compact Atmospheric Mapper (ACAM) and a shipborne <a title="Learn more about Radiometers from ScienceDirect's AI-generated Topic Pages"> radiometer </a> in Chesapeake Bay in July–August 2011, this study investigates diurnal changes of surface <a title="Learn more about Remote Sensing from ScienceDirect's AI-generated Topic Pages"> remote sensing </a> reflectance ( R rs ). Atmospheric correction of ACAM data is performed using the traditional “black pixel” approach through <a title="Learn more about Radiative Transfer from ScienceDirect's AI-generated Topic Pages"> radiative transfer </a> based look-up-tables (LUTs) with non-zero R rs in the <a title="Learn more about Near Infrared from ScienceDirect's AI-generated Topic Pages"> near-infrared </a> (NIR) accounted for by iterations. The ACAM-derived R rs was firstly evaluated through comparison with R rs derived from the <a title="Learn more about MODIS from ScienceDirect's AI-generated Topic Pages"> Moderate Resolution Imaging Spectroradiometer </a> 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 <a title="Learn more about MODIS from ScienceDirect's AI-generated Topic Pages"> MODIS </a> 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 <a title="Learn more about Estuary from ScienceDirect's AI-generated Topic Pages"> estuaries </a> such as Chesapeake Bay. The findings also support future <a title="Learn more about Geostationary Satellite from ScienceDirect's AI-generated Topic Pages"> geostationary satellite </a> missions that are particularly useful to assess short-term changes.

Original language	American English
Journal	Estuarine, Coastal and Shelf Science
Volume	200
DOIs	https://doi.org/10.1016/j.ecss.2017.10.021
State	Published - Jan 1 2018

Keywords

Airborne
Diurnal changes
ACAM
Atmospheric correction
Chesapeake bay

Disciplines

Life Sciences

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10.1016/j.ecss.2017.10.021License: CC BY

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

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

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. ",

keywords = "Airborne, Diurnal changes, ACAM, Atmospheric correction, Chesapeake bay",

author = "Minwei Zhang and Chuanmin Hu and Jennifer Cannizzaro and Kowalewski, {Matthew G.} and Janz, {Scott J.}",

year = "2018",

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doi = "10.1016/j.ecss.2017.10.021",

language = "American English",

volume = "200",

journal = "Estuarine, Coastal and Shelf Science",

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AU - Zhang, Minwei

AU - Hu, Chuanmin

AU - Cannizzaro, Jennifer

AU - Kowalewski, Matthew G.

AU - Janz, Scott J.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

KW - Airborne

KW - Diurnal changes

KW - ACAM

KW - Atmospheric correction

KW - Chesapeake bay

UR - https://digitalcommons.usf.edu/msc_facpub/1980

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DO - 10.1016/j.ecss.2017.10.021

M3 - Article

VL - 200

JO - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

ER -

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

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