Michael J. Sayers
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View article: Improved Detection of Great Lakes Water Quality Anomalies Using Remote Sensing
Improved Detection of Great Lakes Water Quality Anomalies Using Remote Sensing Open
Due to their immense economic and recreational value, the monitoring of Great Lakes water quality is of utmost importance to the region. Historically, this has taken place through a combination of ship-based sampling, buoy measurements, an…
View article: Are Harmful Algal Blooms Increasing in the Great Lakes?
Are Harmful Algal Blooms Increasing in the Great Lakes? Open
This study used satellite remote sensing to investigate trends in harmful algal blooms (HABs) over the last 21 years, focusing on four regions within the Laurentian Great Lakes: western Lake Erie, Green Bay, Saginaw Bay, and western Lake S…
View article: Phytoplankton composition from sPACE: requirements, opportunities, and challenges
Phytoplankton composition from sPACE: requirements, opportunities, and challenges Open
Ocean color satellites have provided a synoptic view of global phytoplankton for over 25 years through surface measurements of the concentration of chlorophyll a.While remote sensing of ocean color has revolutionized our understanding of p…
View article: Assessment of using spaceborne LiDAR to monitor the particulate backscatter coefficient on large, freshwater lakes: A test using CALIPSO on Lake Michigan
Assessment of using spaceborne LiDAR to monitor the particulate backscatter coefficient on large, freshwater lakes: A test using CALIPSO on Lake Michigan Open
The Cloud-Aerosol LiDAR and Infrared Pathfinder Satellite Observation (CALIPSO) satellite was launched in 2006 with the primary goal of measuring the properties of clouds and aerosols in Earth’s atmosphere using LiDAR. Since then, numerous…
View article: Validation of ICESat-2 Derived Data Products on Freshwater Lakes: Bathymetry, Diffuse Attenuation Coefficient for Downwelling Irradiance (<i>K<sub>d</sub> </i>), and Particulate Backscatter Coefficient (<i>b</i> <sub>bp</sub>)
Validation of ICESat-2 Derived Data Products on Freshwater Lakes: Bathymetry, Diffuse Attenuation Coefficient for Downwelling Irradiance (<i>K<sub>d</sub> </i>), and Particulate Backscatter Coefficient (<i>b</i> <sub>bp</sub>) Open
Monitoring large bodies of water, such as the Laurentian Great Lakes in North America, can be challenging and costly. The bathymetry, the diffuse attenuation coefficient for downwelling irradiance (Kd), and the particulate backscattering c…
View article: Classification of Eurasian Watermilfoil (Myriophyllum spicatum) Using Drone-Enabled Multispectral Imagery Analysis
Classification of Eurasian Watermilfoil (Myriophyllum spicatum) Using Drone-Enabled Multispectral Imagery Analysis Open
Remote sensing approaches that could identify species of submerged aquatic vegetation (SAV) and measure their extent in lake littoral zones would greatly enhance SAV study and management, especially if these approaches can provide faster o…
View article: A review of carbon monitoring in wet carbon systems using remote sensing
A review of carbon monitoring in wet carbon systems using remote sensing Open
Carbon monitoring is critical for the reporting and verification of carbon stocks and change. Remote sensing is a tool increasingly used to estimate the spatial heterogeneity, extent and change of carbon stocks within and across various sy…
View article: Measuring the Impact of the COVID-19 Shutdown on Great Lakes Water Quality Using Remote Sensing
Measuring the Impact of the COVID-19 Shutdown on Great Lakes Water Quality Using Remote Sensing Open
The states of Michigan and Ohio issued shutdown orders in mid-March 2020 in an attempt to slow the spread of the coronavirus (COVID-19), resulting in widespread disruption to economic and human activity. This study, which was commissioned …
View article: Carbon Fixation Trends in Eleven of the World’s Largest Lakes: 2003–2018
Carbon Fixation Trends in Eleven of the World’s Largest Lakes: 2003–2018 Open
Large freshwater lakes provide immense value to the surrounding populations, yet there is limited understanding of how these lakes will respond to climate change and other factors. This study uses satellite remote sensing to estimate annua…
View article: Unmanned aerial system based spectroradiometer for monitoring harmful algal blooms: A new paradigm in water quality monitoring
Unmanned aerial system based spectroradiometer for monitoring harmful algal blooms: A new paradigm in water quality monitoring Open
Water quality issues continue to impact recreational and resource use of waterways in the Great Lakes and across smaller inland water bodies in their watersheds. With the advancements in small unmanned aerial systems (sUAS) and in small se…
View article: Spatial and temporal variability of inherent and apparent optical properties in western Lake Erie: Implications for water quality remote sensing
Spatial and temporal variability of inherent and apparent optical properties in western Lake Erie: Implications for water quality remote sensing Open
Lake Erie has experienced dramatic changes in water quality over the past several decades requiring extensive monitoring to assess effectiveness of adaptive management strategies. Remote sensing offers a unique potential to provide synopti…
View article: Evaluating visible derivative spectroscopy by varimax-rotated, principal component analysis of aerial hyperspectral images from the western basin of Lake Erie
Evaluating visible derivative spectroscopy by varimax-rotated, principal component analysis of aerial hyperspectral images from the western basin of Lake Erie Open
The Kent State University (KSU) spectral decomposition method provides information about the spectral signals present in multispectral and hyperspectral images. Pre-processing steps that enhance signal to noise ratio (SNR) by 7.37–19.04 ti…
View article: Spatial-temporal variability of in situ cyanobacteria vertical structure in Western Lake Erie: Implications for remote sensing observations
Spatial-temporal variability of in situ cyanobacteria vertical structure in Western Lake Erie: Implications for remote sensing observations Open
Remote sensing has provided expanded temporal and spatial range to the study of harmful algal blooms (cyanoHABs) in western Lake Erie, allowing for a greater understanding of bloom dynamics than is possible through in situ sampling. Howeve…
View article: CHARACTERIZING FRESHWATER PHYTOPLANKTON DYNAMICS WITH ELECTRO-OPTICAL REMOTE SENSING
CHARACTERIZING FRESHWATER PHYTOPLANKTON DYNAMICS WITH ELECTRO-OPTICAL REMOTE SENSING Open
Freshwater lakes are an important component contributing to ecosystem health and biodiversity on local, regional, and global scales. And while lakes only represent <5% of the global surface area, they are often very productive systems whic…
View article: Bio-optical retrieval algorithm for the optically shallow waters of lAKE MICHIGAN. II. efficiency assessment
Bio-optical retrieval algorithm for the optically shallow waters of lAKE MICHIGAN. II. efficiency assessment Open
With the exception of a few areas, Lake Michigan (LM) is an oligotrophic clear water body. It is predominantly in its littoral zone where ecology-relevant processes unfold due to a variety of natural and anthropogenic forcings arising from…
View article: SATELLITE OBSERVED WATER QUALITY CHANGES IN THE LAURENTIAN GREAT LAKES DUE TO INVASIVE SPECIES, ANTHROPOGENIC FORCING, AND CLIMATE CHANGE
SATELLITE OBSERVED WATER QUALITY CHANGES IN THE LAURENTIAN GREAT LAKES DUE TO INVASIVE SPECIES, ANTHROPOGENIC FORCING, AND CLIMATE CHANGE Open
Long time series of ocean and land color satellite data can be used to measure Laurentian Great Lakes water quality parameters including chlorophyll, suspended minerals, harmful algal blooms (HABs), photic zone and primary productivity on …
View article: Intercomparison of Approaches to the Empirical Line Method for Vicarious Hyperspectral Reflectance Calibration
Intercomparison of Approaches to the Empirical Line Method for Vicarious Hyperspectral Reflectance Calibration Open
Analysis of visible remote sensing data research requires removing atmospheric effects by conversion from radiance to at-surface reflectance. This conversion can be achieved through theoretical radiative transfer models, which yield good r…
View article: Next day generation of water quality products to support NASA Hyperspectral Imaging of Lake Erie
Next day generation of water quality products to support NASA Hyperspectral Imaging of Lake Erie Open
In 2015 NASA Glenn operated a hyperspectral imaging system (HSI) from a small aircraft in an effort to provide information regarding harmful cyanobacteria (cyanoHAB) presence in Lake Erie and the Ohio River. The team flew missions at least…