![]() Notice the dark ocean swath extending from the leeward / dry side ( much less effluents ) of the island - leeward: predominant ocean currents and weather-wise, which almost always move from East to West, at that location. You'll even feel the difference, temperature-wise, when swimming through them! Boat-wakes will also induce those flatter spots, after the water has settled down.īelow: A picture of Kauai, Hawaii state, USA. from a high vantage point ), where you will see wide, vein-like, flatter-shinier patches. One can sometimes see this effect on calm days, looking at wide bodies of water ( esp. One of them is water temperature, I suspect, affecting surface tension. Rasmussen said, much of the time, what appears as darker or lighter water areas are indeed caused by different degrees of reflectance, due to a variety of factors. ![]() Sentinel 2B, Saint Lucia, GIF of bands 2,8,3,4,5,11,6,7,8a,12Ĭredit: EU, Contains modified Copernicus Sentinel data 2019, processed with EO BrowserĪs M. (I excluded bands 10, 1 and 9 because their poor resolution made the video too jumpy) To try and see the temporal component, I extracted separate bands using EO Browser for the same scene, and I made a gif that shows the time-lapse of the data in the same order as they are observed by the sensor. ![]() Another cause of bright spots on waves could be foam, but that would likely last longer than 0.5 s. Table 2 on the referenced page lists delays for each band, summarized here (listing offset in seconds relative to B02): | B02 | B08 | B03 | B10 | B04 | B05 | B11 | B06 | B07 | B8a | B12 | B01 | B09 | The "heap of pixels of different colors (green, red, blue)" is caused by the fact that the different channels of Sentinel-2 MSI are capturing the light reflected by the waves at slightly different times and at a slightly different angles.ĭetails of the sensor configuration that causes this are available in the MSI Instrument Technical Guide.
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