L2A scene classification for Sentinel-2

News
2

A “Scene classification map” is now available as a layer in EO Browser whenever Sentinel2-L2A dataset is visualized. E.g., check out how the classification map looks like around lake Ohrid: https://apps.sentinel-hub.com/eo-browser/#lat=41.07663&lng=20.53431&zoom=13&time=2018-07-06&preset=SCENE-CLASSIFICATION-MAP&datasource=Sentinel-2%20L2A

The Scene classification map is a result of Scene classification algorithm by ESA, which is described here: https://sentinel.esa.int/web/sentinel/technical-guides/sentinel-2-msi/level-2a/algorithm

The script currently used for visualization in EO Browser is:

 function RGBToColor (a, b, c){
	return [a/255, b/255, c/255];
}

switch (SCL) {
  // No Data (Missing data) (black)    
  case 0: return RGBToColor (0, 0, 0);
    
  // Saturated or defective pixel (red)   
  case 1: return RGBToColor (255, 0, 0);

  // Dark features / Shadows (very dark grey)
  case 2: return RGBToColor (47,  47,  47);
    
  // Cloud shadows (dark brown)
  case 3: return RGBToColor (100, 50, 0);
    
  // Vegetation (green)
  case 4: return RGBToColor (0, 160, 0);
    
  // Not-vegetated (dark yellow)
  case 5: return RGBToColor (255, 230, 90);
    
  // Water (dark and bright) (blue)
  case 6: return RGBToColor (0, 0, 255);
  
  // Unclassified (dark grey)
  case 7: return RGBToColor (128, 128, 128);
  
  // Cloud medium probability (grey)
  case 8: return RGBToColor (192, 192, 192);
    
  // Cloud high probability (white)
  case 9: return RGBToColor (255, 255, 255);
  
  // Thin cirrus (very bright blue)
  case 10: return RGBToColor (100, 200, 255);
    
  // Snow or ice (very bright pink)
  case 11: return RGBToColor (255, 150, 255);

  default : return RGBToColor (0, 0, 0);  
}
3 Likes