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RESEARCH PRODUCT

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

Jesús DelegidoMarcela PereiraCarolina TenjoJ. C. JiménezXavier LazzaroJose MorenoAntonio Ruiz-verdúJosé A. Sobrino

subject

Chlorophyll aWatershed010504 meteorology & atmospheric sciences0211 other engineering and technologiesAtmospheric correctionClimate change02 engineering and technology01 natural sciencesSea surface temperaturechemistry.chemical_compoundchemistryOcean colorEnvironmental scienceEutrophicationImage resolution021101 geological & geomatics engineering0105 earth and related environmental sciencesRemote sensing

description

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.

yearjournalcountryeditionlanguage
2016-07-012016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
https://doi.org/10.1109/igarss.2016.7730993