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Sensors 2014, 14(12), 24116-24131; doi:10.3390/s141224116

Evaluation of Multi-Resolution Satellite Sensors for Assessing Water Quality and Bottom Depth of Lake Garda

1
National Research Council of Italy, Institute for Electromagnetic Sensing of the Environment, Milano 20133, Italy
2
Earth Observation and MAPping GmbH & Co.KG, Seefeld 82229, Germany
3
National Research Council of Italy, Institute of Marine Sciences, Venezia 30122, Italy
4
Aquatic Remote Sensing Group, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Oceans and Atmosphere Flagship, Canberra 2601, Australia
*
Author to whom correspondence should be addressed.
Received: 31 October 2014 / Revised: 2 December 2014 / Accepted: 8 December 2014 / Published: 15 December 2014
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Italy 2014)
View Full-Text   |   Download PDF [1025 KB, uploaded 15 December 2014]   |  

Abstract

In this study we evaluate the capabilities of three satellite sensors for assessing water composition and bottom depth in Lake Garda, Italy. A consistent physics-based processing chain was applied to Moderate Resolution Imaging Spectroradiometer (MODIS), Landsat-8 Operational Land Imager (OLI) and RapidEye. Images gathered on 10 June 2014 were corrected for the atmospheric effects with the 6SV code. The computed remote sensing reflectance (Rrs) from MODIS and OLI were converted into water quality parameters by adopting a spectral inversion procedure based on a bio-optical model calibrated with optical properties of the lake. The same spectral inversion procedure was applied to RapidEye and to OLI data to map bottom depth. In situ measurements of Rrs and of concentrations of water quality parameters collected in five locations were used to evaluate the models. The bottom depth maps from OLI and RapidEye showed similar gradients up to 7 m (r = 0.72). The results indicate that: (1) the spatial and radiometric resolutions of OLI enabled mapping water constituents and bottom properties; (2) MODIS was appropriate for assessing water quality in the pelagic areas at a coarser spatial resolution; and (3) RapidEye had the capability to retrieve bottom depth at high spatial resolution. Future work should evaluate the performance of the three sensors in different bio-optical conditions. View Full-Text
Keywords: satellite remote sensing; Lake Garda; aquatic optics; remote sensing reflectance; fieldwork activities satellite remote sensing; Lake Garda; aquatic optics; remote sensing reflectance; fieldwork activities
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Giardino, C.; Bresciani, M.; Cazzaniga, I.; Schenk, K.; Rieger, P.; Braga, F.; Matta, E.; Brando, V.E. Evaluation of Multi-Resolution Satellite Sensors for Assessing Water Quality and Bottom Depth of Lake Garda. Sensors 2014, 14, 24116-24131.

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