Publicación: Aplicación de la teledetección y modelos de regresión en la caracterización del Lago de Sanabria
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2016-10-01
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Atribución-NoComercial-SinDerivadas 4.0 Internacional
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Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias
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El estudio de lagos mediante Teledetección es una herramienta útil para controlar parámetros de calidad de las aguas, como la concentración de clorofila-a o la transparencia ya que proporciona una buena cobertura espacial y temporal a coste reducido. Uno de los principales problemas es que los algoritmos empíricos que habitualmente se emplean se obtienen mediante regresión estadística entre radiancias o reflectancias y datos específicos obtenidos in situ, con la consiguiente dependencia de las características locales (atmosféricas, geológicas y ecológicas) del lago en el que realiza ha realizado el estudio. Por tanto, la inferencia de modelos de regresión obtenidos para determinadas masas de agua no es posible para otras situaciones en las que no se reproducen las mismas condiciones. Un complemento a la Teledetección, que permitiría la generalización a distintos casos, sería la inversión de modelos físicos que describan los procesos básicos, basados en la teoría de transferencia radiativa. En la aplicación al Lago Sanabria, el más grande de España, se ha analizado la concentración del clorofila-a, comparando los datos in situ con los recavados procesando imágenes procedentes de Landsat-8 con distintos modelos empíricos obtenidos para distintos lagos del Planeta. Debido a la cobertura de nubes, el desfase entre fechas de toma de datos y la no coincidencia en las características de los lagos para los que se obtuvieron las regresiones empleadas, no ha sido posible determinar el grado de eutrofización del lago.
The study of lakes by means of remote sensing is a useful tool to monitor water quality parameters such as concentration of chlorophyll-a [chl-a] or transparency, since it provides reliable, low-cost spatial and temporal coverage. However, one of the main problems is that the empirical algorithms that are normally used are the result of the statistical regression between radiances or reflectances and specific data obtained in situ. The consequence is a dependency on the characteristics (atmospheric, geological and ecological) of the lake in which the study has been developed. Therefore, the inference of regression models obtained for a particular body of water is not applicable to other sites under different conditions. A good complement to remote sensing, which could enable a wider-ranging application of the test, would be the inversion of physical models describing basic processes based on the theory of radiative transfer. As a test, this project has analyzed the concentration of chlorophyll-a in Lake Sanabria, the largest lake in Spain. A comparison has been drawn between data obtained in situ and data obtained from Landsat- 8 images coming from different empirical models used in a variety of lakes around the world. Because of the clouds, the lack of synchronicity among the data collection dates, and the divergence in the characteristics of the lakes for which the used regressions were obtained, it has not been possible to determine the status of eutrophication of the lake.
The study of lakes by means of remote sensing is a useful tool to monitor water quality parameters such as concentration of chlorophyll-a [chl-a] or transparency, since it provides reliable, low-cost spatial and temporal coverage. However, one of the main problems is that the empirical algorithms that are normally used are the result of the statistical regression between radiances or reflectances and specific data obtained in situ. The consequence is a dependency on the characteristics (atmospheric, geological and ecological) of the lake in which the study has been developed. Therefore, the inference of regression models obtained for a particular body of water is not applicable to other sites under different conditions. A good complement to remote sensing, which could enable a wider-ranging application of the test, would be the inversion of physical models describing basic processes based on the theory of radiative transfer. As a test, this project has analyzed the concentration of chlorophyll-a in Lake Sanabria, the largest lake in Spain. A comparison has been drawn between data obtained in situ and data obtained from Landsat- 8 images coming from different empirical models used in a variety of lakes around the world. Because of the clouds, the lack of synchronicity among the data collection dates, and the divergence in the characteristics of the lakes for which the used regressions were obtained, it has not been possible to determine the status of eutrophication of the lake.
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Facultad de Ciencias
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Física Matemática y de Fluídos