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

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

}

const map = [
  [0, 0x5DA400],  //0 - High quality
  [1, 0xBDBD5B],  //1 - Medium quality
  [2, 0xFFC000],  //2 - Low quality
  [3, 0xFF0000],  //3 - Minimal quality
  [205, 0x7B7B7B],  //205 - Cloud or cloud shadow
  [255, 0xFFFFFF],  //255 - No data
];

const visualizer = new ColorMapVisualizer(map);

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

General description of the script

This script visualises the Sentinel 2-based River and Lake Ice Extent quality layer.

Table 1: Classification classes and colouring scheme.

Value Color Label
0 high quality
1 medium quality
2 low quality
3 minimal quality
205 cloud or cloud shadow
255 no data

Description of representative images

31th July 2022, Östersund, SE

RLIES2 QC

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