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+////// Script 2: Calculate indices and apply a mask //////
+
+// Load an image.
+var image = ee.Image('LANDSAT/LC08/C01/T1_TOA/LC08_044034_20140318');
+
+// Center map view
+Map.centerObject(image,10)
+
+// Create an NDWI image, define visualization parameters and display. 
+var ndwi = image.normalizedDifference(['B3', 'B5']);
+var ndwiViz = {min: 0.5, max: 1, palette: ['00FFFF', '0000FF']}; 
+Map.addLayer(ndwi, ndwiViz, 'NDWI');
+Map.addLayer(ndwi, ndwiViz, 'NDWI false', false); 
+
+// Question 1: What's "false" doing?
+//Zeigt den Layer nicht an.
+
+// Mask the non-watery parts of the image, where NDWI < 0.4. 
+var ndwiMasked = ndwi.updateMask(ndwi.gte(0.4)); 
+Map.addLayer(ndwiMasked, ndwiViz, 'NDWI masked');
+
+// Question 2: What does the function .gte actually do?
+//Maskiert alles wo der NDWI unter 0.4 ist.
+
+//// Create visualization layers.
+// The .visualize function creates images that contain the visualisation parameters. 
+var imageRGB = image.visualize({bands: ['B3', 'B2', 'B1'], max: 0.5});
+var ndwiRGB = ndwiMasked.visualize({min: 0.5, max: 1, palette: ['00FFFF', '0000FF']});
+Map.addLayer(imageRGB, {}, 'imageRGB');
+Map.addLayer(ndwiRGB, {}, 'NDWI masked - 2'); //looks the same than the fist visualization, just another layer
+
+// Mosaic the visualization layers and display.
+var mosaic = ee.ImageCollection([imageRGB, ndwiRGB]).mosaic(); 
+Map.addLayer(mosaic, {}, 'mosaic');
+
+//Question 3: What does the mosaic function do?
+//Fügt das RGB Image und das NDWI Image zusammen.
+
+
+
+
+
+
+// Exercise 2a:
+// Calculate the NDVI and visualize it
+var ndvi = image.normalizedDifference(['B4', 'B5']);
+
+// Find a threshold for differentiating vegetated and non-vegetated areas
+var ndviViz = {min: -1, max: 1}; 
+Map.addLayer(ndvi, ndviViz, 'NDVI');
+
+// Create a mask that masks non-vegetated areas
+// Mask the non-planty parts of the image, where NDVI < 0. 
+var ndviMasked = ndvi.updateMask(ndvi.gte(0)); 
+
+// Find a nice visualization
+var ndviRGB = ndviMasked.visualize({min: -1, max: 1, palette: ['00FFFF', '0000FF']});
+Map.addLayer(ndviRGB, {}, 'NDVI masked');
+
+// Create a mosaic of the Landsat image and the NDVI data.
+var mosaic = ee.ImageCollection([imageRGB, ndviRGB]).mosaic(); 
+Map.addLayer(mosaic, {}, 'mosaic');
+
+
+