Peter Gege
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View article: Differentiating phytoplankton taxa in lakes using hyperspectral in situ reflectance and imaging microscopy
Differentiating phytoplankton taxa in lakes using hyperspectral in situ reflectance and imaging microscopy Open
Phytoplankton play a central role in aquatic ecosystems, influencing biogeochemical cycles, food web dynamics, and overall water quality. Monitoring their composition is essential for assessing water ecosystem health and detecting environm…
View article: Airborne Remote Sensing for Environmental and Disaster Management Applications
Airborne Remote Sensing for Environmental and Disaster Management Applications Open
As a national research institution, the German Aerospace Center (DLR) has the largest fleet of research aircraft in Europe and uses optical imaging systems to provide a valuable research basis for a wide range of applications in the fields…
View article: GALENE: A proposed future satellite mission dedicated to the observation of coastal and inland aquatic ecosystems, including the monitoring of water quality and the detection of marine plastics
GALENE: A proposed future satellite mission dedicated to the observation of coastal and inland aquatic ecosystems, including the monitoring of water quality and the detection of marine plastics Open
Coastal and inland aquatic ecosystems are of fundamental interest to society and economy, given their tight link to urbanization and economic value creation. These ecosystems, which are continuously impacted by natural processes and human …
View article: WASI-AI: Synergistic Integration of AI and Physics for Retrieving Water Quality and Benthic Parameters from Multi- and Hyperspectral Images
WASI-AI: Synergistic Integration of AI and Physics for Retrieving Water Quality and Benthic Parameters from Multi- and Hyperspectral Images Open
Artificial intelligence (AI) has spurred significant progress in the remote sensing of water constituents through physical models that rely on a predefined database of simulations, e.g., Case-2 Regional/Coast Color processor. However, thes…
View article: Unleashing the power of remote sensing data in aquatic research: Guidelines for optimal utilization
Unleashing the power of remote sensing data in aquatic research: Guidelines for optimal utilization Open
The growing utilization of remote sensing data in lake studies provides crucial spatial insights into biogeochemistry and biology. However, clarity regarding the development and intended use of remote sensing products is often lacking. Thi…
View article: Full mission evaluation of EnMAP water leaving reflectance products using three atmospheric correction processors
Full mission evaluation of EnMAP water leaving reflectance products using three atmospheric correction processors Open
This study presents what we believe is the first extensive assessment of the water reflectance products from the German hyperspectral Environmental Mapping and Analysis Program (EnMAP). We evaluate EnMAP’s standard normalized water leaving…
View article: Water Quality Retrieval from Landsat-9 (OLI-2) Imagery and Comparison to Sentinel-2
Water Quality Retrieval from Landsat-9 (OLI-2) Imagery and Comparison to Sentinel-2 Open
The Landsat series has marked the history of Earth observation by performing the longest continuous imaging program from space. The recent Landsat-9 carrying Operational Land Imager 2 (OLI-2) captures a higher dynamic range than sensors ab…
View article: The Spaceborne Imaging Spectrometer Desis: Data Access and Scientific Applications
The Spaceborne Imaging Spectrometer Desis: Data Access and Scientific Applications Open
The DLR Earth Sensing Imaging Spectrometer (DESIS) is a space-based instrument installed and operated on the International Space Station (ISS). This space mission is the achievement of the collaboration between the German Aerospace Center …
View article: Radiometric Measurement Requirements to Derive Information on Phytoplankton Community Composition from Satellite
Radiometric Measurement Requirements to Derive Information on Phytoplankton Community Composition from Satellite Open
The high spectral resolution of hyperspectral sensors is beneficial for distinguishing phytoplankton types, but the increased noise compared to multispectral land and ocean satellite sensors decreases the sensitivity to concentration chang…
View article: Inter-Comparison of Methods for Chlorophyll-a Retrieval: Sentinel-2 Time-Series Analysis in Italian Lakes
Inter-Comparison of Methods for Chlorophyll-a Retrieval: Sentinel-2 Time-Series Analysis in Italian Lakes Open
Different methods are available for retrieving chlorophyll-a (Chl-a) in inland waters from optical imagery, but there is still a need for an inter-comparison among the products. Such analysis can provide insights into the method selection,…
View article: Physics-based Bathymetry and Water Quality Retrieval Using PlanetScope Imagery: Impacts of 2020 COVID-19 Lockdown and 2019 Extreme Flood in the Venice Lagoon
Physics-based Bathymetry and Water Quality Retrieval Using PlanetScope Imagery: Impacts of 2020 COVID-19 Lockdown and 2019 Extreme Flood in the Venice Lagoon Open
The recent PlanetScope constellation (130+ satellites currently in orbit) has shifted the high spatial resolution imaging into a new era by capturing the Earth’s landmass including inland waters on a daily basis. However, studies on the aq…
View article: Spectral and Radiometric Measurement Requirements for Inland, Coastal and Reef Waters
Spectral and Radiometric Measurement Requirements for Inland, Coastal and Reef Waters Open
This paper studies the measurement requirements of spectral resolution and radiometric sensitivity to enable the quantitative determination of water constituents and benthic parameters for the majority of optically deep and optically shall…
View article: Simulation data of inland and reef waters
Simulation data of inland and reef waters Open
This dataset contains Simulations.zip. Simulation data of the article by P. Gege and A.G. Dekker, "Spectral and radiometric measurement requirements for inland and reef waters". Submitted to Remote Sensing, 2020. The data are organized in …
View article: Simulation data of inland and reef waters
Simulation data of inland and reef waters Open
This dataset contains Simulations.zip. Simulation data of the article by P. Gege and A.G. Dekker, "Spectral and radiometric measurement requirements for inland and reef waters". Submitted to Remote Sensing, 2020. The data are organized in …
View article: OPTMIZATION OF BIO-OPTICAL MODEL PARAMETERS FOR TURBID LAKE WATER QUALITY ESTIMATION USING LANDSAT 8 AND WASI-2D
OPTMIZATION OF BIO-OPTICAL MODEL PARAMETERS FOR TURBID LAKE WATER QUALITY ESTIMATION USING LANDSAT 8 AND WASI-2D Open
Laguna Lake, the Philippines’ largest freshwater lake, has always been historically, economically, and ecologically significant to the people living near it. However, as it lies at the center of urban development in Metro Manila, it suffer…
View article: The hyperspectral sensors DESIS for aquatic ecosystems monitoring - a sensitivity study
The hyperspectral sensors DESIS for aquatic ecosystems monitoring - a sensitivity study Open
The aquatic ecosystems of coastal and inland waters are more variable than the open ocean as water constituents and bottom substrates differ considerably in type, concentration and optical properties. Sensors with high spatial, spectral an…
View article: Retrieval of Water Constituents from Hyperspectral In-Situ Measurements under Variable Cloud Cover—A Case Study at Lake Stechlin (Germany)
Retrieval of Water Constituents from Hyperspectral In-Situ Measurements under Variable Cloud Cover—A Case Study at Lake Stechlin (Germany) Open
Remote sensing and field spectroscopy of natural waters is typically performed under clear skies, low wind speeds and low solar zenith angles. Such measurements can also be made, in principle, under clouds and mixed skies using airborne or…
View article: Feasibility Study for an Aquatic Ecosystem Earth Observing System Version 1.2.
Feasibility Study for an Aquatic Ecosystem Earth Observing System Version 1.2. Open
International audience
View article: Connectivity and Synchronisation of Lake Ecosystems in Space and Time - CONNECT
Connectivity and Synchronisation of Lake Ecosystems in Space and Time - CONNECT Open
Within the project CONNECT we are establishing a collaborative network between experts in remote sensing (RS) and freshwater ecology to study connectivity and coherence of lake ecosystems in a regional context at unprecedented temporal and…
View article: Sensitivity study for aquatic ecosystem monitoring with the DESIS hyperspectral sensor
Sensitivity study for aquatic ecosystem monitoring with the DESIS hyperspectral sensor Open
The aquatic ecosystems of coastal and inland waters are more variable than the open ocean as water constituents and bottom substrates differ considerably in type, concentration and optical properties. Sensors with high spatial, spectral an…
View article: HMM Imaging of the Aquatic Ecosystem
HMM Imaging of the Aquatic Ecosystem Open
The oceans are monitored since decades using multispectral sensors on satellite, but very little information is available for the majority of inland waters since they are too small for ocean colour satellites, optically too complex for mos…
View article: Deriving aerosol parameters from in–situ spectrometer measurements for validation of remote sensing products
Deriving aerosol parameters from in–situ spectrometer measurements for validation of remote sensing products Open
Uncertainties of aerosol parameters are the limiting factor for atmospheric correction over inland and coastal waters. For
\nvalidating remote sensing products from these optically complex and spatially inhomogeneous waters the spatial
\…
View article: Envilab: Measuring phytoplankton in-vivo absorption and scattering properties under tunable environmental conditions
Envilab: Measuring phytoplankton in-vivo absorption and scattering properties under tunable environmental conditions Open
Optical remote sensing of phytoplankton draws on distinctive spectral features which can vary with both species and environmental conditions. Here, we present a set-up (ENVILAB) for growing phytoplankton under well-defined light, temperatu…
View article: Variability of adjacency effects in sky reflectance measurements
Variability of adjacency effects in sky reflectance measurements Open
Sky reflectance Rsky(λ) is used to correct in situ reflectance measurements in the remote detection of water color. We analyzed the directional and spectral variability in Rsky(λ) due to adjacency effects against an atmospheric radiance mo…