SWOT_Geomorph/GEE_ndwi_Fig4 at main · mollystroud/SWOT_Geomorph · GitHub

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/**** Start of imports. If edited, may not auto-convert in the playground. ****/
var geometry =
    /* color: #d63000 */
    /* shown: false */
    /* displayProperties: [
      {
        "type": "rectangle"
      }
    ] */
    ee.Geometry.Polygon(
        [[[-94.15359428793933, 44.13547909509888],
          [-94.15359428793933, 44.04374674745631],
          [-94.0643303719237, 44.04374674745631],
          [-94.0643303719237, 44.13547909509888]]], null, false);
/***** End of imports. If edited, may not auto-convert in the playground. *****/
// pre-dam image:
var collection = ee.ImageCollection('COPERNICUS/S2_SR_HARMONIZED')
    .filterBounds(geometry)
    .filterDate('2024-06-07', '2024-06-08')
    .select(['B4', 'B3', 'B2', 'B8'])
    .median();
// post-dam image:
var collection2 = ee.ImageCollection('COPERNICUS/S2_SR_HARMONIZED')
    .filterDate('2024-07-07', '2024-07-08')
    .filterBounds(geometry)
    .select(['B4', 'B3', 'B2', 'B8'])
    .median();

// clip
var clipImage = collection.clip(geometry);
var clipImage2 = collection2.clip(geometry);
// viz
var visualization = {
  min: 0,
  max: 3000,
  bands: ['B4', 'B3', 'B2'],
}
// add to map
Map.addLayer(clipImage, visualization, '6-08')
Map.addLayer(clipImage2, visualization, '7-08')
Map.centerObject(geometry, 12)
// water mask
var ndwi =
    clipImage.normalizedDifference(['B3', 'B8']).rename('NDWI');
//var ndwiParams = {min: -1, max: 1, palette:['red', 'yellow', 'green', 'cyan', 'blue']};
var ndwiParams = {min: -1, max: 1, palette:['white', '0096C7', '023E8A']};
Map.addLayer(
    ndwi,
    ndwiParams,
    'NDWI');
// export ndwi image
Export.image.toDrive({
  image: ndwi.visualize(ndwiParams),
  description: 'image_export',
  folder: 'SWOT_geomorph',
  region: geometry,
  scale: 12
});
// export real color image
//Export.image.toDrive({
  //image: clipImage.visualize(visualization),
  //description: 'image_export',
  //folder: 'SWOT_geomorph',
  //region: geometry,
  //scale: 12
//});