CLMS HR-S&I: Sentinel-2 River and Lake Ice Extent visualisation script 

//VERSION=3
function setup() {
  return {
    input: ["RLIE", "dataMask"],
    output: {
      bands: 4,
      sampleType: "Auto"
    }
  };

}

const map = [
  [1, 0x0000FE],  //1 - Open water
  [100, 0x00E8FF],  //100 - Snow-covered or snow-free ice
  [254, 0xFF0000],  //254 - Other features
  [205, 0x7B7B7B],  //205 - Cloud or cloud shadows
  [255, 0xFFFFFF]  //255 - No data
];

const visualizer = new ColorMapVisualizer(map);

function evaluatePixel(sample) {
  let rgbVis = visualizer.process(sample.RLIE);
  return rgbVis.concat(sample.dataMask);
}

General description of the script

This script visualises the River and Lake Ice Extent based on optical satellite data from the Sentinel-2 constellation. The product is generated for the entire EEA38+UK zone.

Table 1: Classification classes and colouring scheme.

Value Color Label
1 open water
100 snow-covered or snow-free ice
254 other features
205 cloud or cloud shadows
255 no data

Description of representative images

03rd February, 2022, Geneva, IT, Lausanne, CH

RLIES2

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