Abstract
The editorial paper aims to highlight the main topics investigated in the Special Issue (SI) “Water Optics and Water Colour Remote Sensing”. The outcomes of the 21 papers published in the SI are presented, along with a bibliometric analysis in the same field, namely, water optics and water colour remote sensing. This editorial summarises how the research articles of the SI approach the study of bio-optical properties of aquatic systems, the development of remote sensing algorithms, and the application of time-series satellite data for assessing long-term and temporal-spatial dynamics in inland, coastal, and oceanic waters. The SI shows the progress with a focus on: (1) bio-optical properties (three papers); (2) atmospheric correction and data uncertainties (five papers); (3) remote sensing estimation of chlorophyll-a (Chl-a) (eight papers); (4) remote sensing estimation of suspended matter and chromophoric dissolved organic matter (CDOM) (four papers); and (5) water quality and water ecology remote sensing (four papers). Overall, the SI presents a variety of applications at the global scale (with case studies in Europe, Asia, South and North America, and the Antarctic), achieved with different remote sensing instruments, such as hyperspectral field and airborne sensors, ocean colour radiometry, geostationary platforms, and the multispectral Landsat and Sentinel-2 satellites. The bibliometric analysis, carried out to include research articles published from 1900 to 2016, indicates that “chlorophyll-a”, “ocean colour”, “phytoplankton”, “SeaWiFS” (Sea-Viewing Wide Field-of-View Sensor), and “chromophoric dissolved organic matter” were the five most frequently used keywords in the field. The SI contents, along with the bibliometric analysis, clearly suggest that remote sensing of Chl-a is one of the topmost investigated subjects in the field.
Highlights
Accurate, accurate, cost-effective, cost-effective, frequent, and synoptic synoptic retrieval algorithms of in-water optical and biogeochemical parameters, as well as information retrieval algorithms of in-water optical and biogeochemical parameters, as well as information on the biophysical properties properties of of the the monitored monitored waters, waters, have have several several challenges. This Special Issue (SI) focusing on “Water Optics and Water Colour Remote Sensing” is aimed at addressing: (1) issues on water optics including the characterisation of optical properties among rivers, reservoirs, lakes, coastal waters, and open sea, modeling the relationships between apparent optical properties (AOPs) and inherent optical properties (IOPs); and (2) challenges on retrieval algorithm developments, validation, and applications of remote sensing of rivers, reservoirs, lakes, coastal waters, and open ocean
The results showed that total suspended matter was the dominant factor in determining Kd (PAR) values and best correlated with Kd (PAR)
The 21 papers published in this SI present a variety of studies mainly related to bio-optical properties measurement and modeling, atmospheric correction and data uncertainties, remote sensing algorithms for Chl-a, suspended matter and chromophoric dissolved organic matter (CDOM), as well as water quality and water ecology applications
Summary
Bibliometrics, which was first introduced by Pritchard [1], has been widely used to quantitatively and qualitatively analyse scientific production and research trends at the decade to century scale with a large amount of data [2]. Plus, were usednumber for this was analysis presented the most frequently used keywords of the water optics and water colour remote sensing. The result of SeaWiFS particular, the frequency “Chl-a” was as high as 532, was much higher indicated the role played in the past from this sensor, while for recent years sensors such as Moderate than the second frequently used keyword “ocean colour” (86). Imaging Spectrometer (MERIS),that and Chl-aOLCI related study was the popular study topics in the field of water optics and water colour remote might be considered as improved successors. This result indicated that Chl-a-related study was the sensing. <
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