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attica-supervised-land-classification.js
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attica-supervised-land-classification.js
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var attica =
/* color: #0b4a8b */
/* shown: false */
/* displayProperties: [
{
"type": "rectangle"
}
] */
ee.Geometry.Polygon(
[[[23.2110357389274, 38.206070688868856],
[23.2110357389274, 37.64494364729591],
[24.08582211588052, 37.64494364729591],
[24.08582211588052, 38.206070688868856]]], null, false),
structures =
/* color: #ffc82d */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.722832311060202, 37.98604269504621]),
{
"LandCover": 1,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.710890150499324, 37.99027102964008]),
{
"LandCover": 1,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.676222541035628, 37.98857907511565]),
{
"LandCover": 1,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.701401776563813, 38.01387358385549]),
{
"LandCover": 1,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.82830641360839, 38.01233050123234]),
{
"LandCover": 1,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.728895081552206, 38.08468021862973]),
{
"LandCover": 1,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.676248683007895, 37.978157732338055]),
{
"LandCover": 1,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.679939402612387, 37.97827612962173]),
{
"LandCover": 1,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.87738330659633, 37.990118837548145]),
{
"LandCover": 1,
"system:index": "8"
}),
ee.Feature(
ee.Geometry.Point([23.78413321887467, 38.07986031790876]),
{
"LandCover": 1,
"system:index": "9"
}),
ee.Feature(
ee.Geometry.Point([23.563576671053916, 38.04361976373704]),
{
"LandCover": 1,
"system:index": "10"
}),
ee.Feature(
ee.Geometry.Point([23.59330426872514, 38.059778091142825]),
{
"LandCover": 1,
"system:index": "11"
})]),
water =
/* color: #00ffff */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.661676788635305, 37.92286610660872]),
{
"LandCover": 2,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.606454817647155, 37.94277636475712]),
{
"LandCover": 2,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.566160943434728, 37.95246236508979]),
{
"LandCover": 2,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.548347889191284, 37.97215440850505]),
{
"LandCover": 2,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.557383521816433, 37.9925483457881]),
{
"LandCover": 2,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.581542779533766, 38.01865365633532]),
{
"LandCover": 2,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.72075141678619, 38.045474530117644]),
{
"LandCover": 2,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.72351600311909, 37.865651364242176]),
{
"LandCover": 2,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.69433356903706, 37.91848460455896]),
{
"LandCover": 2,
"system:index": "8"
}),
ee.Feature(
ee.Geometry.Point([23.611249462591747, 37.87486604280219]),
{
"LandCover": 2,
"system:index": "9"
}),
ee.Feature(
ee.Geometry.Point([24.041532969565065, 38.056532165817096]),
{
"LandCover": 2,
"system:index": "10"
}),
ee.Feature(
ee.Geometry.Point([24.029516673178346, 37.87816578326174]),
{
"LandCover": 2,
"system:index": "11"
}),
ee.Feature(
ee.Geometry.Point([23.89715677701301, 38.1690285963769]),
{
"LandCover": 2,
"system:index": "12"
}),
ee.Feature(
ee.Geometry.Point([24.013121609318013, 38.148720744718474]),
{
"LandCover": 2,
"system:index": "13"
})]),
soil =
/* color: #bf04c2 */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.616151642612902, 37.94237918207922]),
{
"LandCover": 3,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.635493051819292, 37.94633892126388]),
{
"LandCover": 3,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.630629645151025, 37.96863322738643]),
{
"LandCover": 3,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.627149097070358, 37.98167109187658]),
{
"LandCover": 3,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.656465474772705, 38.02321147196569]),
{
"LandCover": 3,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.72004798626504, 38.03370011121143]),
{
"LandCover": 3,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.74978178584261, 38.05532582091939]),
{
"LandCover": 3,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.64523813785602, 38.06003275047307]),
{
"LandCover": 3,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.65040722606349, 38.08403646029273]),
{
"LandCover": 3,
"system:index": "8"
}),
ee.Feature(
ee.Geometry.Point([23.938562789819855, 38.08512120649901]),
{
"LandCover": 3,
"system:index": "9"
}),
ee.Feature(
ee.Geometry.Point([23.75462075061929, 38.07118174433912]),
{
"LandCover": 3,
"system:index": "10"
})]),
vegetation =
/* color: #ff0000 */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.75906440392205, 38.00491312489803]),
{
"LandCover": 4,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.748706479272343, 37.98244170404808]),
{
"LandCover": 4,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.738396067819096, 37.98749849407307]),
{
"LandCover": 4,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.73529543419788, 37.9924196507234]),
{
"LandCover": 4,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.720242877206303, 38.035774125154276]),
{
"LandCover": 4,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.745595116815068, 38.0404807978776]),
{
"LandCover": 4,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.8135451599611, 37.966069613719995]),
{
"LandCover": 4,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.639833988292132, 38.007267208000144]),
{
"LandCover": 4,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.643224662603014, 38.02838971142539]),
{
"LandCover": 4,
"system:index": "8"
}),
ee.Feature(
ee.Geometry.Point([23.82074183384109, 38.05987324423261]),
{
"LandCover": 4,
"system:index": "9"
}),
ee.Feature(
ee.Geometry.Point([23.677353769871633, 37.99500727533915]),
{
"LandCover": 4,
"system:index": "10"
}),
ee.Feature(
ee.Geometry.Point([23.740902981293946, 38.14523926644351]),
{
"LandCover": 4,
"system:index": "11"
}),
ee.Feature(
ee.Geometry.Point([23.76675947619751, 38.150571677193945]),
{
"LandCover": 4,
"system:index": "12"
}),
ee.Feature(
ee.Geometry.Point([23.86022249564027, 38.096375762155034]),
{
"LandCover": 4,
"system:index": "13"
}),
ee.Feature(
ee.Geometry.Point([23.845642007435313, 38.09315878812063]),
{
"LandCover": 4,
"system:index": "14"
})]),
roads =
/* color: #00ff00 */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.712586258793536, 37.98042396589105]),
{
"LandCover": 4,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.713689878001357, 37.983137310999076]),
{
"LandCover": 4,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.710267379298354, 37.98545432303957]),
{
"LandCover": 4,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.707247211947585, 37.96392612567052]),
{
"LandCover": 4,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.71991414201875, 37.96091134788731]),
{
"LandCover": 4,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.732641286521762, 37.99733844018295]),
{
"LandCover": 4,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.710683230905385, 38.00500665205455]),
{
"LandCover": 4,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.745581335419324, 37.90627778822394]),
{
"LandCover": 4,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.667236408439155, 37.94512221607737]),
{
"LandCover": 4,
"system:index": "8"
}),
ee.Feature(
ee.Geometry.Point([23.831226871541478, 38.02580847405912]),
{
"LandCover": 4,
"system:index": "9"
}),
ee.Feature(
ee.Geometry.Point([24.008861817683822, 37.77324325196618]),
{
"LandCover": 4,
"system:index": "10"
})]),
denseVegetation =
/* color: #0000ff */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.81373750572194, 37.96608332212135]),
{
"LandCover": 5,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.78310039679273, 37.99381080914337]),
{
"LandCover": 5,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.5979126397775, 37.992760249026695]),
{
"LandCover": 5,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.710779190182027, 38.13538285434384]),
{
"LandCover": 5,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.718552073068125, 38.178352873495086]),
{
"LandCover": 5,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.86538281554469, 38.099125959468715]),
{
"LandCover": 5,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.813735723216915, 38.06183397235706]),
{
"LandCover": 5,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.737832913610312, 37.993573446229874]),
{
"LandCover": 5,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.748803148481223, 37.98211578398123]),
{
"LandCover": 5,
"system:index": "8"
}),
ee.Feature(
ee.Geometry.Point([23.736682804635656, 37.9731004891005]),
{
"LandCover": 5,
"system:index": "9"
})]),
lightVegetation =
/* color: #999900 */
/* shown: false */
ee.FeatureCollection(
[ee.Feature(
ee.Geometry.Point([23.67009396905085, 38.02718502351752]),
{
"LandCover": 6,
"system:index": "0"
}),
ee.Feature(
ee.Geometry.Point([23.671043088444208, 38.04438445313574]),
{
"LandCover": 6,
"system:index": "1"
}),
ee.Feature(
ee.Geometry.Point([23.788523561542004, 37.92294159624229]),
{
"LandCover": 6,
"system:index": "2"
}),
ee.Feature(
ee.Geometry.Point([23.847929126803844, 38.08652324014357]),
{
"LandCover": 6,
"system:index": "3"
}),
ee.Feature(
ee.Geometry.Point([23.581813673063213, 37.97672917135574]),
{
"LandCover": 6,
"system:index": "4"
}),
ee.Feature(
ee.Geometry.Point([23.724902260543423, 38.03985223490778]),
{
"LandCover": 6,
"system:index": "5"
}),
ee.Feature(
ee.Geometry.Point([23.718062627555447, 38.0405958172099]),
{
"LandCover": 6,
"system:index": "6"
}),
ee.Feature(
ee.Geometry.Point([23.74674286610224, 38.04445634613339]),
{
"LandCover": 6,
"system:index": "7"
}),
ee.Feature(
ee.Geometry.Point([23.901402168915833, 38.01741832543896]),
{
"LandCover": 6,
"system:index": "8"
})]);
// Import Landsat 8 Image Collection
var L8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR")
.filterDate('2019-05-01', '2019-08-31') // filter date May-Spetember 2020
.filterBounds(attica) // filter to get only images under attica region
.filterMetadata("CLOUD_COVER", "less_than", 1); // Filter to get images with Cloud Cover less than 1%
print(L8.size());
// Median for each pixel from L8 ImageCollection
// Clip image to attica region
var L8_2 = L8.median().clip(attica);
print(L8_2);
// Calculate NDVI & NDBI indices and add them as additional bands
// getIndices function
var getIndices = function (image) {
var ndvi = image.normalizedDifference(["B5", "B4"]).rename("NDVI");
var ndbi = image.normalizedDifference(["B6", "B5"]).rename("NDBI");
return image.addBands(ndvi).addBands(ndbi);
};
var L8_3 = getIndices(L8_2);
print(L8_3);
//Select specific bands for classification
var classificationBands = ["B2", "B3", "B4", "B5", "B6", "B7", "NDVI", "NDBI"];
var L8final = L8_3.select(classificationBands);
print(L8final)
// Function to add layers to the map and export the result to Google Drive
var produceVisualization = function (image, description) {
Map.addLayer(image, {}, description);
Export.image.toDrive({
image: image,
description: description.replace(/\s+/g, ''),
scale: 50,
region: attica,
crs: "EPSG:4326",
folder: "gee_output"
});
};
/******************************************
* Supervised classification: Procedure 1 *
******************************************/
// Training Dataset
var trainingSamples = structures.merge(water).merge(vegetation).merge(soil);
// Select training data
var trainingData = L8final.select(classificationBands).sampleRegions({
collection: trainingSamples,
properties: ["LandCover"],
scale: 30,
});
print(trainingData)
// Train a classifier
var classifier = ee.Classifier.smileRandomForest(20).train({
features: trainingData,
classProperty: "LandCover",
inputProperties: classificationBands,
});
// Aply classifier to image
var classifiedImage = L8final.classify(classifier);
// Add Map Layer
var palette = [
"c3c3c3", // urban (1)
"447dff", // water (2)
"ac8563", // soil (3)
"35cd33", // vegetation (4)
];
var plotParameters = {
min: 1,
max: 4,
palette: palette,
};
produceVisualization(classifiedImage.visualize(plotParameters), 'Attica_LandCover');
/*************************************************************
* Supervised classification: Procedure 2 | Extended classes *
*************************************************************/
// Training Dataset
trainingSamples = structures.merge(water).merge(denseVegetation).merge(lightVegetation).merge(roads).merge(soil);
// Select training data
trainingData = L8final.select(classificationBands).sampleRegions({
collection: trainingSamples,
properties: ["LandCover"],
scale: 30,
});
print(trainingData)
// Train a classifier
classifier = ee.Classifier.smileRandomForest(20).train({
features: trainingData,
classProperty: "LandCover",
inputProperties: classificationBands,
});
// Aply classifier to image
classifiedImage = L8final.classify(classifier);
// Add Map Layer
palette = [
"c3c3c3", // urban (1)
"447dff", // water (2)
"ac8563", // soil (3)
"5c5a5a", // roads (4)
"2c592c", // dense vegetation (5)
"35cd33", // light vegetation (6)
];
plotParameters = {
min: 1,
max: 6,
palette: palette,
};
produceVisualization(classifiedImage.visualize(plotParameters), 'Attica_extended_LandCover');
// Center view
Map.centerObject(attica, 10);