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Sentinel-5P Cloud Optical Thickness

var minVal = 0.0;
var maxVal = 250.0;
var diff = maxVal - minVal;
const map = [
	[minVal, 0x00007f], 
	[minVal + 0.125 * diff, 0x0000ff],
	[minVal + 0.375 * diff, 0x00ffff],
	[minVal + 0.625 * diff, 0xffff00],
	[minVal + 0.875 * diff, 0xff0000],
	[maxVal, 0x7f0000]

const visualizer = new ColorRampVisualizer(map)
function setup() {
   return {
    input: ["CLOUD_OPTICAL_THICKNESS","dataMask"],
    output: { bands: 4 }

function evaluatePixel(samples) {
   const [r, g, b] = visualizer.process(samples.CLOUD_OPTICAL_THICKNESS);
   return [r, g, b, samples.dataMask];

Evaluate and Visualize


This script visualizes Sentinel 5P cloud optical thickness product. The cloud thickness is a key parameter to characterise optical properties of clouds. It is a measure of how much sunlight passes through the cloud to reach Earth’s surface. The higher a cloud’s optical thickness, the more sunlight the cloud is scattering and reflecting. Dark blue shows where there are low cloud optical thickness values and red shows larger cloud optical thickness.

Description of representative images

Optical thickness of the Pacific Ocean hurricane, 2020-01-15. NO2 tropospheric column