added ws202425 courses

2022_Spezielle_Themen_der_Fernerkundung/01_Landsatimage.js

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+////// Satellite images and RGB color presentation //////
+
+/// Open a satellite image and create an RGB-Composite
+
+// Load an image.
+var image = ee.Image('LANDSAT/LC08/C01/T1_TOA/LC08_044034_20140318');
+
+// Define the visualization parameters.
+var visParams = {
+  bands: ['B5', 'B4', 'B3'],
+  min: 0,
+  max: 0.5,
+};
+
+// Center the map and set zoom level
+Map.setCenter(-122.1899, 37.5010, 10); // San Francisco Bay
+
+// Visualize image
+Map.addLayer(image, visParams, 'false color composite');
+
+//// Exercise 1a:
+// Play around with the visualization
+
+
+//// Clip the image to a feature:
+
+// Create a circle by drawing a 20000 meter buffer around a point.
+//var roi = ee.Geometry.Point([-122.4481, 37.7599]).buffer(20000);
+
+// Display a clipped version of the mosaic.
+// After the layers are visible in the Map view, please do only display the layer "buffer"
+//Map.addLayer(image.clip(roi), visParams, 'buffer');
+
+//// Exercise 1b:
+// Create a polygon and clip the image to this feature
+// 1. Create a polygon with the available tool (freehand or rectangle)
+// 2. You will find the feature under imports at the beginning of your script
+// 3. Change the function image.clip accordingly
+// 4. Re-run the sript
+Map.addLayer(image.clip(Rechteck), visParams, 'Rechteck')