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I am looking to obtain free satellite images to detect oil spills in the Mediterranean sea. What sensors would be most appropriate for this task and where can I download this type of data?

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I would recommend Landsat or MODIS for this task. You can access Landsat or MODIS data through Earth Explorer or Reverb|Echo. There are a number of publications on the subject to help you along the way:

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  • With that resolution, you wont be able to see a lot in MODIS and furthermore for analysis i'd recommend LS.
    – g07kore
    May 20, 2015 at 17:31
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    @g07kore MODIS has much higher spectral resolution than Landsat and, therefore, is very useful for detecting large scale phenomenon such as oil slicks. The second paper shows that the researches successfully used MODIS to detect oil slicks even 75m in width.
    – Aaron
    May 20, 2015 at 17:39
  • I am aware of that and did not believe it before i saw your second link. I was more concerned that with the spatial resolution of 250m you'll lose a lot of information. Especially the second figure comparing MODIS and SAR imagery is impressive.
    – g07kore
    May 20, 2015 at 17:50

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