Results 251 to 260 of about 6,072,571 (291)

Optical discrimination of emulsified oil in optically complex estuarine waters

Marine Pollution Bulletin, 2022
Coastal estuaries, characterized by highly varying waters with complex optical properties, pose challenges for effective oil discrimination via optical remote sensing. In this study, an object-based spectra comparison (OBSC) approach was proposed to extract emulsified oil slicks from Balikpapan Bay, Indonesia, using optical imagery from Sentinel-2 ...
Shaojie, Sun, Ying, Chen, Xi, Chen, Bin, Ai, Jun, Zhao   +4 more
openaire   +2 more sources

Improved Algorithms for Accurate Retrieval of UV/Visible Diffuse Attenuation Coefficients in Optically Complex, Inshore Waters [PDF]

Remote Sensing of Environment, 2014
Photochemical processes driven by high-energy ultraviolet radiation (UVR) in inshore, estuarine, and coastal waters play an important role in global bio geochemical cycles and biological systems.
Cédric G. Fichot, William L Miller, Stanford B Hooker   +2 more
exaly   +1 more source

Spectral modes of radiometric measurements in optically complex waters

Continental Shelf Research, 2021
Abstract The case-1 (optically simple) oceanic environment is described by a smoothly transitioning gradient in optical properties arising from the concentration of the primary algal photopigment, chlorophyll a, plus its covarying and optically relevant constituents.
Stanford B. Hooker, Henry F. Houskeeper, Raphael M. Kudela, Atsushi Matsuoka, Koji Suzuki, Tomonori Isada   +5 more
openaire   +1 more source

Retrieving Phytoplankton Functional Groups from Water Reflectance in Optically Complex Waters

Optica Sensing Congress 2023 (AIS, FTS, HISE, Sensors, ES), 2023
It is very hard to discriminate PFGs in optically complex waters even if hyperspectral data is available. Features characteristic to one group may be sometimes observed in reflectance of other phytoplankton groups. Reflectance depends on phytoplankton phenology, biomass and vertical distribution making reflectance spectra of a single group very ...
Tiit Kutser, Birgot Paavel, Karolin Teeveer, Martin Ligi, Mirjam Uusõue, Külli Kutser, Ele Vahtmäe   +6 more
openaire   +1 more source

Optical Classification of Optically Complex Waters Around China

2014 6th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS), 2014
For optically complex waters, the optical classification was suggested to be a good solution to improve the retrieval of biogeochemical products, and more appropriate for large-scale complex waters than classical regional waters. Around China there are turbid lakes, complex rivers and highly contrasted coastal regions, so the study provided an ...
Shen Qian
exaly   +2 more sources

Absorption Characteristics of Optically Complex Inland Waters: Implications for Water Optical Classification

Journal of Geophysical Research G: Biogeosciences, 2013
Multiple bio‐optical measurements were conducted in inland waters of China, including Lake Taihu [spring and autumn], Lake Chaohu, Lake Dianchi, and Three Gorges Reservoirs. The variations in the absorption characteristics of chromophoric dissolved organic matter (CDOM), phytoplankton, and non‐algal particles (NAP) and their relative contributions to ...
Yunmei Li, Kun Shi, Heng Lu
exaly   +2 more sources

Remote Estimation of Chlorophyll a in Optically Complex Waters Based on Optical Classification

Remote Sensing of Environment, 2011
Abstract Accurate assessment of phytoplankton chlorophyll a (Chla) concentration in turbid waters by means of remote sensing is challenging due to optically complexity and significant variability of case 2 waters, especially in inland waters with multiple optical types.
Yunmei Li, Deyong Sun, Yong Zha
exaly   +2 more sources

Remote Estimation of Water Clarity in Optically Complex Estuarine Waters

Remote Sensing of Environment, 1999
Abstract AVHRR satellite imagery was evaluated as a potential data source for monitoring light attenuation (KPAR), as a measure of turbidity, in Pamlico Sound estuary, North Carolina. In situ water quality data and reflectance imagery collected on 10 different dates were used to calibrate a general optical equation relating satellite-derived ...
Dana L. Woodruff, Richard P. Stumpf, Julie A. Scope, Hans W. Paerl   +3 more
openaire   +1 more source

Satellite Bathymetry Estimation in the Optically Complex Northern Baltic Sea [PDF]

Estuarine, Coastal and Shelf Science
Satellite bathymetry estimation (SBE) is a cost-effective method for producing depth information for shallow marine and aquatic areas. However, most SBE methods have been developed and are refined in clear water conditions and their feasibility in ...
Elina Virtanen, Niko Kulha, Sampsa Koponen   +2 more
exaly   +2 more sources

Influence of a Red Band-Based Water Classification Approach on Chlorophyll Algorithms for Optically Complex Estuaries

Remote Sensing of Environment, 2014
Empirical chlorophyll algorithms depend on the inter-relationships of the various in-water optical constituents which may change in both space and time in optically complex estuaries.
Deyong Sun, Jennifer Cannizzaro, Brian B Barnes   +2 more
exaly   +2 more sources