Sentinel-3 OLCI true color under Sentinel-5 products 

//VERSION=3
//True color S3OLCI under S5P
//Author: Monja B. Šebela

function setup() {
  return {
    input: [
      {datasource: "S3OLCI", bands:["B04", "B06", "B08"]},
      {datasource: "S5PL2", bands:["CLOUD_TOP_PRESSURE"]}],
    output: [
      {id: "default", bands: 3, sampleType: SampleType.AUTO}
    ]
  }
}

function evaluatePixel(samples, inputData, inputMetadata, customData, outputMetadata){
var S5 = samples.S5PL2[0]
var S3 = samples.S3OLCI[0]
var CLOUD_TOP_PRESSURE = S5.CLOUD_TOP_PRESSURE
//CLOUD_TOP_PRESSURE visualization
var minVal = 10000.0;
var maxVal = 110000.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];
//End of CLOUD_TOP_PRESSURE visualization
  if (CLOUD_TOP_PRESSURE>0){
    return{default:colorBlend(CLOUD_TOP_PRESSURE, limits, colors)}
  }
    return{default:[S3.B08*3, S3.B06*3, S3.B04*3.5]}
}

/*To replace the CLOUD_TOP_PRESSURE product with other products, replace all "CLOUD_TOP_PRESSURE" mentions in the script with the other available products: 
AER_AI_340_380, AER_AI_354_388, CLOUD_BASE_HEIGHT, CLOUD_BASE_PRESSURE, CLOUD_FRACTION, CLOUD_OPTICAL_THICKNESS, CLOUD_TOP_HEIGHT, CLOUD_TOP_PRESSURE, CO, HCHO, NO2, O3, SO2, CH4
*/

// Visualizations for other products: 

/*
-- AER_AI_340_380
var minVal = -1.0;
var maxVal = 5.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0,0,0.5], [0,0,1], [0,1,1], [1,1,0], [1,0,0], [0.5,0,0]];

-- AER_AI_354_388
var minVal = -1.0;
var maxVal = 5.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0,0,0.5], [0,0,1], [0,1,1], [1,1,0], [1,0,0], [0.5,0,0]];

-- CH4
var minVal = 1600.0;
var maxVal = 2000.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- CO
var minVal = 0.0;
var maxVal = 0.1;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- HCHO
var minVal = 0.0;
var maxVal = 0.001;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- NO2
var minVal = 0.0;
var maxVal = 0.0001;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- O3
var minVal = 0.0;
var maxVal = 0.36;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- SO2
var minVal = 0.0;
var maxVal = 0.01;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0,0,0.5], [0,0,1], [0,1,1], [1,1,0], [1,0,0], [0.5,0,0]];

-- CLOUD_BASE_HEIGHT
var minVal = 0.0;
var maxVal = 20000.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- CLOUD_BASE_PRESSURE;
var minVal = 10000.0;
var maxVal = 110000.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- CLOUD_FRACTION;
var minVal = 0.0;
var maxVal = 1.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0,0,0.5], [0,0,1], [0,1,1], [1,1,0], [1,0,0], [0.5,0,0]];

-- CLOUD_OPTICAL_THICKNESS;
var minVal = 0.0;
var maxVal = 250.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- CLOUD_TOP_HEIGHT;
var minVal = 0.0;
var maxVal = 20000.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];

-- CLOUD_TOP_PRESSURE;
var minVal = 10000.0;
var maxVal = 110000.0;
var diff = maxVal - minVal;
var limits = [minVal, minVal + 0.125 * diff, minVal + 0.375 * diff, minVal + 0.625 * diff, minVal + 0.875 * diff, maxVal];
var colors = [[0, 0, 0.5], [0, 0, 1], [0, 1, 1], [1, 1, 0], [1, 0, 0], [0.5, 0, 0]];
*/

Authors

Author of the datafusion script:

  • Monja B. Šebela

Evaluate and visualize

General description of the script

As Sentinel-5P is transparent where there is no data, this script fills in the gaps with true color Sentinel-3 OLCI imagery. It can be useful to get a feeling of the land below the clouds, or to show the underestimation of S5P cloud products, where white clouds are visible. The script can be modified to fit any Sentinel-5P product, by just replacing the “band” in custom script, and by replacing the visualization (this is very important, as S5P products have different units).

Description of representative images

Cloud base pressure over OLCI true color base pressure