40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
////// 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') |