@article{JechowBumbergerPalmetal.2024, author = {Jechow, Andreas and Bumberger, Jan and Palm, Bert and Remmler, Paul and Schreck, G{\"u}nter and Ogashawara, Igor and Kiel, Christine and Kohnert, Katrin and Grossart, Hans-Peter and Singer, Gabirel A. and Nejstgaard, Jens C. and Wollrab, Sabine and Berger, Stella A. and H{\"o}lker, Franz}, title = {Characterizing and Implementing the Hamamatsu C12880MA Mini-Spectrometer for Near-Surface Reflectance Measurements of Inland Waters}, series = {Sensors}, volume = {24}, journal = {Sensors}, number = {19}, publisher = {MDPI}, doi = {10.3390/s24196445}, pages = {1 -- 14}, year = {2024}, abstract = {In recent decades, inland water remote sensing has seen growing interest and very strong development. This includes improved spatial resolution, increased revisiting times, advanced multispectral sensors and recently even hyperspectral sensors. However, inland waters are more challenging than oceanic waters due to their higher complexity of optically active constituents and stronger adjacency effects due to their small size and nearby vegetation and built structures. Thus, bio-optical modeling of inland waters requires higher ground-truthing efforts. Large-scale ground-based sensor networks that are robust, self-sufficient, non-maintenance-intensive and low-cost could assist this otherwise labor-intensive task. Furthermore, most existing sensor systems are rather expensive, precluding their employability. Recently, low-cost mini-spectrometers have become widely available, which could potentially solve this issue. In this study, we analyze the characteristics of such a mini-spectrometer, the Hamamatsu C12880MA, and test it regarding its application in measuring water-leaving radiance near the surface. Overall, the measurements performed in the laboratory and in the field show that the system is very suitable for the targeted application.}, language = {en} } @article{OgashawaraWollrabBergeretal.2024, author = {Ogashawara, Igor and Wollrab, Sabine and Berger, Stella A. and Kiel, Christine and Jechow, Andreas and Guislain, Alexis L. N. and Gege, Peter and Ruhtz, Thomas and Hieronymi, Martin and Schneider, Thomas and Lischeid, Gunnar and Singer, Gabriel A. and H{\"o}lker, Franz and Grossart, Hans-Peter and Nejstgaard, Jens Christian}, title = {Unleashing the power of remote sensing data in aquatic research: Guidelines for optimal utilization}, series = {Limnology and Oceanography Letters}, journal = {Limnology and Oceanography Letters}, publisher = {Wiley}, doi = {10.1002/lol2.10427}, pages = {1 -- 7}, year = {2024}, abstract = {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. This letter aims to elucidate the tradeoffs for the utilization of remote sensing data in limnological studies with an example of based on the estimation of chlorophyll a due to its importance as a water quality indicator. The analysis initiates with a meticulous product selection, requiring an evaluation of its capacity to address the optical complexity of freshwater systems. Assessing atmospheric correction and product limitations ensures alignment with the study's objectives. Subsequently, rigorous validation of remote sensing products is essential, accompanied by a cautious interpretation of the data. This letter advocates for the use of remote sensing data, offering key strategies for their optimal utilization in lake studies.}, language = {en} }