Abstract
Many studies deal with water quality evaluation using remotely sensed data. In the field of remote sensing, there have been proposed several procedures how to observe selected parameters of water quality and conditions. The majority of works use methods and procedures based on satellite data but they usually do not deal with suitability and practicability of the satellite data. This paper provides summary of determinants and limitations of satellite data utilization for water quality evaluation. Cloud cover and its influence on size of visible water surfaces is the most deeply evaluated determinants. Temporal resolution, spatial resolution and some other technical factors are discussed as next determinants. The case study demonstrates evaluation of the determinants for Landsat 7 and Landsat 8 data (level 1) and for area of small ponds in part of Pardubice region in the Czech Republic. It clearly demonstrates several limitations of Landsat data for evaluation of selected parameters of water quality and changes of small water bodies.
Highlights
Observing of water quality in inland water bodies such as lakes or ponds has a significant impact on the quality of human life
Detecting of chlorophyll and other water quality determinants based on remote sensing brings some limitations mentioned across related papers
There is iterated through all the chosen Landsat images in geodatabase, clear water surface is classified based on the signature, the output of classification is vectorised and it is intersected with the reference layer to determinate the percentage of clear water compared to reference layer
Summary
Observing of water quality in inland water bodies such as lakes or ponds has a significant impact on the quality of human life. As well as other authors, Guan and Wang find high correlation suitable for determining the parameters on base of remotely sensed data. Modern trend in remote sensing is to observe water quality using alternative carriers like UAVs. In (Zang, 2012) the research is focused especially on using UAVs in monitoring of water pollution. The paper is focused on suitability of remote sensing data for water quality observation in a real situation. Papers usually describe data processing, models proposals and obtained results in a form of case studies focused on a particular water body. They usually do not evaluate a practical suitability and availability of Landsat data for real problems solution. The case study is based on the proposed set of parameters
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