Comparison of MODIS and Landsat-8 retrievals of chlorophyll-a and water temperature over Lake Titicaca

Chlorophyll-a concentration ([Chl-a]) and Lake Surface Temperature (LST) were retrieved in Lake Titicaca (Peru-Bolivia) using MODIS and Landsat-8 images. The lake was chosen as a case-study for evaluating the feasibility of Landsat-8 images for [Chl-a] and LST monitoring in oligotrophic and mesotrophic water bodies. The big size of the lake and its spatial and temporal variability, allowed the comparison of MODIS and Landsat-8 products for a wide range of [Chl-a] and LST. The atmospheric correction of the images was facilitated by the very high altitude of the lake. MODIS images were processed with standard ocean color algorithms whereas for Landsat-8, specific algorithms were tested and validated The results show that Landsat-8 is capable of retrieving [Chl-a] and LST with an accuracy comparable to that of MODIS and with a finer spatial resolution, revealing surface patterns in greater detail. The combined use of both sensors allows monitoring the eutrophication and temperature trends of Lake Titicaca, which is a water body of the highest ecological interest, increasingly affected by human activities in its watershed and very sensitive to climate changes.

Autors:
A. Ruiz-Verdú; J. C. Jiménez, X. Lazzaro; C. Tenjo; J. Delegido; M. Pereira; J. A. Sobrino and J. Moreno
Url link:
https://www2.securecms.com/IGARSS2016/Default.asp
Event:
IEEE International Geoscience and Remote Sensing Symposium, Beijing, China, 10-15 July (2016)
Ref:
A. Ruiz-Verdú; J. C. Jiménez, X. Lazzaro; C. Tenjo; J. Delegido; M. Pereira; J. A. Sobrino and J. Moreno (2016). Comparison of MODIS and Landsat-8 retrievals of chlorophyll-a and water temperature over Lake Titicaca. In: IEEE International Geoscience and Remote Sensing Symposium, Beijing, China, 10-15 July (2016)
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