Sentinel 2

Mission

Sentinel-2 Mission Guide

---

Bands

Sentinel Band Chart

---

Starter Code

Open in Code Editor

//  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//  Title:        starter_S2.js
//  Author:       Jeff Howarth
//  Last edited:  10/24/2023
//
//  Starter for Sentinel 2 collection. 
//  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

var geometry = 
    ee.Geometry.Point([37.34715255366928, -3.0521293499524087]);

Map.centerObject(geometry, 8);

// ------------------------------------------------------------------------
//  Scale and offset  
// ------------------------------------------------------------------------

function scale_S2(image) {

  return image.multiply(0.0001);
} 

// ------------------------------------------------------------------------
//  Cloud mask  
// ------------------------------------------------------------------------

function cloudMask_S2 (image) {
  var qa = image.select('QA60');

  var cloudBitMask = 1 << 10;
  var cirrusBitMask = 1 << 11;

  var SCL = image.select('SCL')
    .remap(
      [1,2,3,4,5,6,7,8,9,10,11],
      [0,1,0,1,1,1,0,0,0, 0, 1]
    );


  // Both flags shoudl be set to zero, indicating clear conditions. 

  var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
      .and(qa.bitwiseAnd(cirrusBitMask).eq(0))
      ;

  return image
    .updateMask(mask)
    .updateMask(SCL);

}

// ----------------------------------------------------------------------
// Filter ingredients
// ----------------------------------------------------------------------


var output = ee.ImageCollection("COPERNICUS/S2_SR_HARMONIZED")
  .filterBounds(geometry)
  // .filter(ee.Filter.calendarRange(2020, 2020, 'year'))
  .filter(ee.Filter.calendarRange(1, 3, 'month')) 
  .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE',20))
  .map(cloudMask_S2)
  .map(scale_S2)
  .median()

;

print(output);

// ----------------------------------------------------------------------
// Display
// ----------------------------------------------------------------------

var viz_bands = ['B4', 'B3', 'B2'];

var viz = {
  bands: viz_bands,
  min: 0.0,
  max: 0.3,
};

Map.addLayer(output, viz, 'From Sentinel 2 Collection');