From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations
Uncertainty estimates are needed to assess ocean color products and qualify the agreement between missions. Comparison between field observations and satellite data, a process defined as validation, has been the traditional way to assess satellite products. However validation statistics can provide...
Published in: | Frontiers in Marine Science |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media S.A.
2021
|
Subjects: | |
Online Access: | https://doi.org/10.3389/fmars.2021.790948 https://doaj.org/article/d822214e76234623b12d7f921b8b75ae |
id |
ftdoajarticles:oai:doaj.org/article:d822214e76234623b12d7f921b8b75ae |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:d822214e76234623b12d7f921b8b75ae 2023-05-15T13:06:39+02:00 From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations Frédéric Mélin 2021-12-01T00:00:00Z https://doi.org/10.3389/fmars.2021.790948 https://doaj.org/article/d822214e76234623b12d7f921b8b75ae EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2021.790948/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.790948 https://doaj.org/article/d822214e76234623b12d7f921b8b75ae Frontiers in Marine Science, Vol 8 (2021) ocean color uncertainties validation VIIRS AERONET-OC Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2021 ftdoajarticles https://doi.org/10.3389/fmars.2021.790948 2022-12-31T12:40:33Z Uncertainty estimates are needed to assess ocean color products and qualify the agreement between missions. Comparison between field observations and satellite data, a process defined as validation, has been the traditional way to assess satellite products. However validation statistics can provide only an approximation for satellite data uncertainties as field measurements have their own uncertainties and as the validation process is imperfect, comparing data potentially differing in temporal, spatial or spectral characteristics. This study describes a method to interpret in terms of uncertainties the validation statistics obtained for ocean color remote sensing reflectance RRS knowing the uncertainties associated with field data. This approach is applied to observations collected at sites part of the Ocean Color component of the Aerosol Robotic Network (AERONET-OC) located in coastal regions of the European seas, and to RRS data from the VIIRS sensors on-board the SNPP and JPSS1 platforms. Similar estimates of uncertainties σVRS (term accounting for non-systematic contributions to the uncertainty budget) are obtained for both missions, decreasing with wavelength from the interval 0.8–1.4 10−3 sr−1 in the blue to a maximum of 0.24 10−3 sr−1 in the red, values that are at least twice (but up to 8 times) the uncertainties reported for the field data. These uncertainty estimates are then used to qualify the agreement between the VIIRS products, defining the extent to which they agree within their stated uncertainty. Despite significant biases between the two missions, their RRS products appear fairly compatible. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean color uncertainties validation VIIRS AERONET-OC Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
ocean color uncertainties validation VIIRS AERONET-OC Science Q General. Including nature conservation geographical distribution QH1-199.5 Frédéric Mélin From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations |
topic_facet |
ocean color uncertainties validation VIIRS AERONET-OC Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Uncertainty estimates are needed to assess ocean color products and qualify the agreement between missions. Comparison between field observations and satellite data, a process defined as validation, has been the traditional way to assess satellite products. However validation statistics can provide only an approximation for satellite data uncertainties as field measurements have their own uncertainties and as the validation process is imperfect, comparing data potentially differing in temporal, spatial or spectral characteristics. This study describes a method to interpret in terms of uncertainties the validation statistics obtained for ocean color remote sensing reflectance RRS knowing the uncertainties associated with field data. This approach is applied to observations collected at sites part of the Ocean Color component of the Aerosol Robotic Network (AERONET-OC) located in coastal regions of the European seas, and to RRS data from the VIIRS sensors on-board the SNPP and JPSS1 platforms. Similar estimates of uncertainties σVRS (term accounting for non-systematic contributions to the uncertainty budget) are obtained for both missions, decreasing with wavelength from the interval 0.8–1.4 10−3 sr−1 in the blue to a maximum of 0.24 10−3 sr−1 in the red, values that are at least twice (but up to 8 times) the uncertainties reported for the field data. These uncertainty estimates are then used to qualify the agreement between the VIIRS products, defining the extent to which they agree within their stated uncertainty. Despite significant biases between the two missions, their RRS products appear fairly compatible. |
format |
Article in Journal/Newspaper |
author |
Frédéric Mélin |
author_facet |
Frédéric Mélin |
author_sort |
Frédéric Mélin |
title |
From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations |
title_short |
From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations |
title_full |
From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations |
title_fullStr |
From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations |
title_full_unstemmed |
From Validation Statistics to Uncertainty Estimates: Application to VIIRS Ocean Color Radiometric Products at European Coastal Locations |
title_sort |
from validation statistics to uncertainty estimates: application to viirs ocean color radiometric products at european coastal locations |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.790948 https://doaj.org/article/d822214e76234623b12d7f921b8b75ae |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Frontiers in Marine Science, Vol 8 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.790948/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.790948 https://doaj.org/article/d822214e76234623b12d7f921b8b75ae |
op_doi |
https://doi.org/10.3389/fmars.2021.790948 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1766014842486915072 |