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In Landsat 8, when you download the geographic image it comes with a quality band (QB) that is primarily meant to show clouds. Maybe that will help?


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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: Brekke, C., & Solberg, A. H. (2005). Oil spill detection by satellite remote sensing. Remote sensing of environment, 95(1), 1-13. Hu, C., Li, X., ...


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For anyone who is interested, I just learned a really quick way to do this. Zoom into the area / extent you are working with > open image analysis window > click the clip tool under processing. A layer will be added to the map of the area in the extent when you performed the clip function.


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Image services such as these do not perform at full capacity unless your dataframe is in the same projection as the image service. To rectify the situation make sure your current data frame is set to the SouthAfrica_Albers_Equal_Area_Conic projected coordinate system. Once you do that, you will find the image service is quite snappy. Right click the ...


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You could use this method: http://support.esri.com/em/knowledgebase/techarticles/detail/30330 or create a polygon representing the area you need to clip and use the Clip function to clip it out.


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Libra provides a really intuitive interface to obtain Landsat imagery according to various spatial, temporal and image-suitability filters. I highly recommend it over EarthExplorer.


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Unless you state specific requirements there's a whole number of satellite missions that provide free raw/NDVI imagery. Some examples are: MODIS Landsat Proba V


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You can try USGS http://www.usgs.gov/. You can create an account for free and then through Earth Explorer http://earthexplorer.usgs.gov/ you can search and download images from different satellites (e.g Landsat).



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