Cloud Masks

Applying masks for clouds, shadows and snow is a very common process. This module provides some funtions to do it directly.

Import module

var cloud_masks = require('users/fitoprincipe/geetools:cloud_masks');

In the cloud_masks module exist the following functions:

Sentinel 2

var sentinel2function = cloud_masks.sentinel2(options)

This function is made to use in collection COPERNICUS/S2. Options are: cirrus and/or opaque. If no argument is passed, will mask both.

Landsat SR

var landsatSRfunction = cloud_masks.landsatSR(options)

This function is made to use in:

• LANDSAT/LT04/C01/T1_SR
• LANDSAT/LT05/C01/T1_SR
• LANDSAT/LE07/C01/T1_SR
• LANDSAT/LC08/C01/T1_SR

It can accept one argument indicating which part you want to mask out. Options are:

• cloud
• snow
• adjacent (not for Landsat 8)
• shadow

Test Cloud masks

There is a module to test cloud_masks. All functions in that module use the center of the map to filter by bounds, so if you move around you'll see different images.

var cloud_masks = require('users/fitoprincipe/geetools:cloud_masks_test');
cloud_masks.sentinel2()  // Test Sentinel 2
cloud_masks.landsat4SR()  // Test Landsat 4 SR
cloud_masks.landsat5SR()  // Test Landsat 5 SR
cloud_masks.landsat7SR(['cloud'])  // Test only cloud of Landsat 7 SR
cloud_masks.landsat8SR(['cloud'], 'L8 SR only cloud')  // Test only cloud of Landsat 8 SR and assign a name to the layer

EXAMPLES

Apply cloud mask in one Sentinel 2 Image

var cloud_masks = require('users/fitoprincipe/geetools:cloud_masks');
var sentinel2function = cloud_masks.sentinel2();

// The original Image
var S2Image = ee.Image('COPERNICUS/S2/20171117T142739_20171117T143844_T18GYU');

// Apply mask
var masked_image = sentinel2function(S2Image);

// Visualize
var vis = {bands:['B8', 'B12', 'B4'], min:0, max:5000};
Map.addLayer(masked_image, vis, 'Sentinel 2 masked');
Map.centerObject(masked_image)

Apply cloud mask in one Landsat SR Image

var cloud_masks = require('users/fitoprincipe/geetools:cloud_masks');
var landsatSRfunction = cloud_masks.landsatSR;

// The original Image
var L8Image = ee.Image('LANDSAT/LC08/C01/T1_SR/LC08_232089_20170416');

// Apply mask
var masked_image = landsatSRfunction()(L8Image);

// Visualize
var vis = {bands:['B5', 'B7', 'B4'], min:0, max:5000}
Map.addLayer(masked_image, vis, 'Landsat 8 SR masked');
Map.centerObject(masked_image)