CLMS HR-S&I: Daily cumulative Gap-filled Fractional Snow Cover - Fractional snow cover (%) quality layer visualisation script

//VERSION=3

function setup() {
  return {
    input: ["QC", "dataMask"],
    output: { bands: 4, sampleType: "AUTO" },
  };
}
const map = [
  [0, 0x00a600], //0 - High Quality
  [1, 0xa6e64d], //1 - Medium Quality
  [2, 0xf2a64d], //2 - Low Quality
  [3, 0xff0000], //3 - Minimal Quality
  [250, 0xcccccc], //250 - Masked
  [255, 0x000000], //255 - NODATA
];

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 Daily cumulative Gap-filled Fractional Snow Cover - Fractional snow cover (%) quality layer.

Table 1: Classification classes and colouring scheme.

Value	Color	Label
1		0 - high quality
2		1 - medium quality
3		2 - low quality
4		3 - minimal quality
5		200 - masked
6		255 - no data

Description of representative images

23rd April 2020, Innsbruck, AT

Resources

• Data source