CLMS HR-S&I: Persistent Snow Area visualisation script

Show script or download it.

//VERSION=3

function setup() {
  return {
    input: ["PSA", "dataMask"],
    output: { bands: 4, sampleType: "AUTO" },
  };
}
const map = [
  [0, 0x00a600], //0 - No persistant snow cover
  [1, 0xe6f2ff], //1 - Persistant snow cover
  [255, 0x000000], //255 - NODATA
];

const visualizer = new ColorMapVisualizer(map);

function evaluatePixel(sample) {
  return [
    visualizer.process(sample.PSA)[0],
    visualizer.process(sample.PSA)[1],
    visualizer.process(sample.PSA)[2],
    sample.dataMask,
  ];
}

General description of the script

This script visualises Persistent Snow Area.

Possible values are as follows:

• 0: no persistent snow
• 1: persistent snow
• 255: no data

Description of representative images

PSA over the Mont Blanc Region, FR

Resources

• Data source