Delta-X: In Situ Spectral Reflectance of Water Surface at MRD at LA, USA, Spring 2021
A newer version exists.
Click the DOI link in the following citation for the latest version (as of 2023-09-21):
Fichot, C.G., and J. Harringmeyer. 2023. Delta-X: In Situ Water Surface Reflectance across MRD, LA, USA, 2021, V3. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2153
This dataset includes above water measurements of remote-sensing reflectance measured in situ at field sampling stations during the Delta-X 2021 Spring campaign. Samples were collected in the Atchafalaya River and Terrebonne Basins on the southern coast of Louisiana from 2021-03-25 to 2021-04-22 using a handheld Portable SpectroRadiometer (PSR-1100f). Reflectance is reported in the dataset as remote sensing reflectance at 1 nm intervals in the range 360 nm-900nm, with uncertainty reported for each wavelength. During the field campaign, reflectance was measured near-simultaneously with collection of field samples and in-water sediment parameters in multiple channels of varying width (from a few meters to >100m), near Delta-X intensive study sites, and in open bays and lakes and at few locations in the nearshore Gulf of Mexico. PSR-1100f, manufactured by Spectral Evolution, was used to measure radiance from: (1) a highly reflective (> 99% reflectance) Lambertian Spectralon panel, ( 2) from the sky, measured at 40 degrees from the solar zenith and at 135 degrees from the sun azimuthal plane, and ( 3) from the water, measured at 40 degrees from nadir and at 135 degrees from the sun azimuthal plane. These measurements were used to calculate remote-sensing reflectance, the water-leaving radiance relative to downwelling irradiance, including a correction for the influence of reflected skylight. At each station, measurement spectra of a single target (water, panel, or sky) were combined through the use of a median filter to create a single representative radiance measurement for the target from multiple spectra. This dataset is used to calibrate and validate Delta-X's algorithms used for the retrieval of total suspended solids concentration from AVIRIS-NG imagery and to inform and validate Delta-X's sediment transport models.
Fichot, C.G., and J. Harringmeyer. 2021. Delta-X: In Situ Spectral Reflectance of Water Surface at MRD at LA, USA, Spring 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1994
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