🟢 Sentinel-2A -- View, Filter & Download

/* ========================= NOTE ==================================
This code considers that you have understood the basics of uploading your vector/shapefile into your 'Asset' folder 
in your Google Earth Engine account. Example as shown below. The example uses a shapefile by the name 'daro'

===================================================================
*/

// This code is to pan the map to go to your area of interest
// Map.setCenter(111.41, 2.54);

//0. Conversion of shape table into feature collection
var daro_ply = ee.FeatureCollection(daro).geometry();

/** This is a function to mask out the clouds. Nothing serious, comes with the whole package if you import the image from the dataset page
 * Function to mask clouds using the Sentinel-2 QA Band
 * @param {ee.Image} image Sentinel-2 image
 * @return {ee.Image} cloud masked Sentinel-2 image
 */

function maskS2clouds(image) {
  var qa = image.select('QA60');

  // Bits 10 and 11 are clouds and cirrus, respectively.
  var cloudBitMask = 1 << 10;
  var cirrusBitMask = 1 << 11;

  // 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).divide(10000);
}



// 1. Load Sentinel-2
var s2_col = ee.ImageCollection('COPERNICUS/S2_SR_HARMONIZED')
  .filterDate('2023-01-01', '2023-12-31')
  .filterBounds(daro_ply)
  .sort('CLOUD_PIXEL_PERCENTAGE')
  .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 25))
  .map(maskS2clouds);

print(s2_col) // Check out the collection at the 'Console' panel

// 2. Set visualization parameter
var visParamsTrue = {
  bands: ['B4', 'B3', 'B2'], 
  min:0.0, 
  max:0.15, 
  gamma:0.9
};


//3. Mosaic to combine the different contiguous image
var mosaik = s2_col.mosaic().clip(daro_ply);

print(mosaik);


Map.addLayer(mosaik, visParamsTrue, 'Mosaic');

/* DELETE THIS LINE IF YOU WANT TO EXPORT THE IMAGE OUT WHEN YOU CLICK 'RUN'
// 3. Exporting Sentinel 2 images
  Export.image.toDrive({
  image: mosaik,
  description: 'Sentinel2_2023_Daro',
  scale: 10,
  region: daro_ply,
  maxPixels: 1e13
}); 

DELETE THIS LINE IF YOU WANT TO EXPORT THE IMAGE OUT WHEN YOU CLICK 'RUN' */