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edited Dec 28, 2017 at 9:31

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var s2 = ee.ImageCollection("COPERNICUS/S2");
var pt = ee.Geometry.Point([-122.41653442382812, 37.77180027337861]);

var cloudyImage = ee.Image('COPERNICUS/S2/20151207T190417_20151207T221905_T10SEG');
Map.centerObject(cloudyImage, 10);
Map.addLayer(cloudyImage, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'cloudy image');

// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = ee.Number(2).pow(10).int();
var cirrusBitMask = ee.Number(2).pow(11).int();

var qa = cloudyImage.select('QA60');

Map.addLayer(qa.bitwiseAnd(cloudBitMask).neq(0), {}, 'clouds');
Map.addLayer(qa.bitwiseAnd(cirrusBitMask).neq(0), {}, 'cirrus');

function maskS2clouds(image) {
  var qa = image.select('QA60');
  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0).and(
             qa.bitwiseAnd(cirrusBitMask).eq(0));
  return image.updateMask(mask);
}

var cloudMasked = s2.filterBounds(pt).map(maskS2clouds);

var median = cloudMasked.median();
Map.addLayer(median, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'median');

var s2 = ee.ImageCollection("COPERNICUS/S2");
var pt = ee.Geometry.Point([-122.41653442382812, 37.77180027337861]);

var cloudyImage = ee.Image('COPERNICUS/S2/20151207T190417_20151207T221905_T10SEG');
Map.centerObject(cloudyImage, 10);
Map.addLayer(cloudyImage, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'cloudy image');

// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = ee.Number(2).pow(10).int();
var cirrusBitMask = ee.Number(2).pow(11).int();

var qa = cloudyImage.select('QA60');

Map.addLayer(qa.bitwiseAnd(cloudBitMask).neq(0), {}, 'clouds');
Map.addLayer(qa.bitwiseAnd(cirrusBitMask).neq(0), {}, 'cirrus');

function maskS2clouds(image) {
  var qa = image.select('QA60');
  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0).and(
             qa.bitwiseAnd(cirrusBitMask).eq(0));
  return image.updateMask(mask);
}

var cloudMasked = s2.filterBounds(pt).map(maskS2clouds);

var median = cloudMasked.median();
Map.addLayer(median, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'median');

var s2 = ee.ImageCollection("COPERNICUS/S2");
var pt = ee.Geometry.Point([-122.41653442382812, 37.77180027337861]);

var cloudyImage = ee.Image('COPERNICUS/S2/20151207T190417_20151207T221905_T10SEG');
Map.centerObject(cloudyImage, 10);
Map.addLayer(cloudyImage, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'cloudy image');

// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = ee.Number(2).pow(10).int();
var cirrusBitMask = ee.Number(2).pow(11).int();

var qa = cloudyImage.select('QA60');

Map.addLayer(qa.bitwiseAnd(cloudBitMask).neq(0), {}, 'clouds');
Map.addLayer(qa.bitwiseAnd(cirrusBitMask).neq(0), {}, 'cirrus');

function maskS2clouds(image) {
  var qa = image.select('QA60');
  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0).and(
             qa.bitwiseAnd(cirrusBitMask).eq(0));
  return image.updateMask(mask);
}

var cloudMasked = s2.filterBounds(pt).map(maskS2clouds);

var median = cloudMasked.median();
Map.addLayer(median, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'median');

var s2 = ee.ImageCollection("COPERNICUS/S2");
var pt = ee.Geometry.Point([-122.41653442382812, 37.77180027337861]);

var cloudyImage = ee.Image('COPERNICUS/S2/20151207T190417_20151207T221905_T10SEG');
Map.centerObject(cloudyImage, 10);
Map.addLayer(cloudyImage, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'cloudy image');

// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = ee.Number(2).pow(10).int();
var cirrusBitMask = ee.Number(2).pow(11).int();

var qa = cloudyImage.select('QA60');

Map.addLayer(qa.bitwiseAnd(cloudBitMask).neq(0), {}, 'clouds');
Map.addLayer(qa.bitwiseAnd(cirrusBitMask).neq(0), {}, 'cirrus');

function maskS2clouds(image) {
  var qa = image.select('QA60');
  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0).and(
             qa.bitwiseAnd(cirrusBitMask).eq(0));
  return image.updateMask(mask);
}

var cloudMasked = s2.filterBounds(pt).map(maskS2clouds);

var median = cloudMasked.median();
Map.addLayer(median, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'median');

Source Link

created Dec 27, 2017 at 22:10

Nicholas Clinton

4.4k
17
22

Here is an example of cloud masking for Sentinel-2:

var s2 = ee.ImageCollection("COPERNICUS/S2");
var pt = ee.Geometry.Point([-122.41653442382812, 37.77180027337861]);

var cloudyImage = ee.Image('COPERNICUS/S2/20151207T190417_20151207T221905_T10SEG');
Map.centerObject(cloudyImage, 10);
Map.addLayer(cloudyImage, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'cloudy image');

// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = ee.Number(2).pow(10).int();
var cirrusBitMask = ee.Number(2).pow(11).int();

var qa = cloudyImage.select('QA60');

Map.addLayer(qa.bitwiseAnd(cloudBitMask).neq(0), {}, 'clouds');
Map.addLayer(qa.bitwiseAnd(cirrusBitMask).neq(0), {}, 'cirrus');

function maskS2clouds(image) {
  var qa = image.select('QA60');
  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0).and(
             qa.bitwiseAnd(cirrusBitMask).eq(0));
  return image.updateMask(mask);
}

var cloudMasked = s2.filterBounds(pt).map(maskS2clouds);

var median = cloudMasked.median();
Map.addLayer(median, {bands: ['B4', 'B3', 'B2'], max: 2000}, 'median');