Suitability of different in-water algorithms for eutrophic and absorbing waters applied to Sentinel-2 MSI and Sentinel-3 OLCI data

Autor: Ave Ansper-Toomsalu, Mirjam Uusõue, Kersti Kangro, Martin Hieronymi, Krista Alikas

Publikováno v: Frontiers in Remote Sensing, Vol 5 (2024)

Optically complex waters present significant challenges for remote sensing due to high concentrations of optically active substances (OASs) and their inherent optical properties (IOPs), as well as the adjacency effect. OASs and IOPs can be derived fr

Externí odkaz: https://doaj.org/article/73700603ea0c499ba51ae3c1b31a9ae6

GLORIA - A globally representative hyperspectral in situ dataset for optical sensing of water quality

Autor: Moritz K. Lehmann, Daniela Gurlin, Nima Pahlevan, Krista Alikas, Ted Conroy, Janet Anstee, Sundarabalan V. Balasubramanian, Cláudio C. F. Barbosa, Caren Binding, Astrid Bracher, Mariano Bresciani, Ashley Burtner, Zhigang Cao, Arnold G. Dekker, Courtney Di Vittorio, Nathan Drayson, Reagan M. Errera, Virginia Fernandez, Dariusz Ficek, Cédric G. Fichot, Peter Gege, Claudia Giardino, Anatoly A. Gitelson, Steven R. Greb, Hayden Henderson, Hiroto Higa, Abolfazl Irani Rahaghi, Cédric Jamet, Dalin Jiang, Thomas Jordan, Kersti Kangro, Jeremy A. Kravitz, Arne S. Kristoffersen, Raphael Kudela, Lin Li, Martin Ligi, Hubert Loisel, Steven Lohrenz, Ronghua Ma, Daniel A. Maciel, Tim J. Malthus, Bunkei Matsushita, Mark Matthews, Camille Minaudo, Deepak R. Mishra, Sachidananda Mishra, Tim Moore, Wesley J. Moses, Hà Nguyễn, Evlyn M. L. M. Novo, Stéfani Novoa, Daniel Odermatt, David M. O’Donnell, Leif G. Olmanson, Michael Ondrusek, Natascha Oppelt, Sylvain Ouillon, Waterloo Pereira Filho, Stefan Plattner, Antonio Ruiz Verdú, Salem I. Salem, John F. Schalles, Stefan G. H. Simis, Eko Siswanto, Brandon Smith, Ian Somlai-Schweiger, Mariana A. Soppa, Evangelos Spyrakos, Elinor Tessin, Hendrik J. van der Woerd, Andrea Vander Woude, Ryan A. Vandermeulen, Vincent Vantrepotte, Marcel R. Wernand, Mortimer Werther, Kyana Young, Linwei Yue

Publikováno v: Scientific Data, Vol 10, Iss 1, Pp 1-14 (2023)

Abstract The development of algorithms for remote sensing of water quality (RSWQ) requires a large amount of in situ data to account for the bio-geo-optical diversity of inland and coastal waters. The GLObal Reflectance community dataset for Imaging

Externí odkaz: https://doaj.org/article/fafa932bf299465985d8cd1ea03995b6

Consistency of six in situ, in vitro and satellite-based methods to derive chlorophyll a in two optically different lakes

Autor: Krista Alikas, Kersti Kangro, Kerttu-Liis Kõks, Marju Tamm, Rene Freiberg, Alo Laas

Publikováno v: Frontiers in Environmental Science, Vol 10 (2023)

Phytoplankton and its most common pigment chlorophyll a (Chl-a) are important parameters in characterizing lake ecosystems. We compared six methods to measure the concentration of Chl a (CChl-a) in two optically different lakes: stratified clear-wate

Externí odkaz: https://doaj.org/article/230f06d256ba4d0ba42bd5d771d45784

Detecting Climate Driven Changes in Chlorophyll-a Using High Frequency Monitoring: The Impact of the 2019 European Heatwave in Three Contrasting Aquatic Systems

Autor: Gary Free, Mariano Bresciani, Monica Pinardi, Claudia Giardino, Krista Alikas, Kersti Kangro, Eva-Ingrid Rõõm, Diana Vaičiūtė, Martynas Bučas, Edvinas Tiškus, Annelies Hommersom, Marnix Laanen, Steef Peters

Publikováno v: Sensors, Vol 21, Iss 18, p 6242 (2021)

The frequency of heatwave events in Europe is increasing as a result of climate change. This can have implications for the water quality and ecological functioning of aquatic systems. We deployed three spectroradiometer WISPstations at three sites in

Externí odkaz: https://doaj.org/article/88875c64cbda4dff86338a0fa9e92fba

Comparison of Above-Water Seabird and TriOS Radiometers along an Atlantic Meridional Transect

Autor: Krista Alikas, Viktor Vabson, Ilmar Ansko, Gavin H. Tilstone, Giorgio Dall’Olmo, Francesco Nencioli, Riho Vendt, Craig Donlon, Tania Casal

Publikováno v: Remote Sensing, Vol 12, Iss 10, p 1669 (2020)

The Fiducial Reference Measurements for Satellite Ocean Color (FRM4SOC) project has carried out a range of activities to evaluate and improve the state-of-the-art in ocean color radiometry. This paper described the results from a ship-based intercomp

Externí odkaz: https://doaj.org/article/2720ef23271c4630bfd82650a807a4ee