added ws202425 courses

2022_Spezielle_Themen_der_Fernerkundung/04a_Metadata.js

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+// Metadata of image collections
+
+// Load a Landsat 8 ImageCollection for a single path-row.
+var collection = ee.ImageCollection('LANDSAT/LC08/C01/T1_TOA')
+    .filter(ee.Filter.eq('WRS_PATH', 44))
+    .filter(ee.Filter.eq('WRS_ROW', 34))
+    .filterDate('2014-03-01', '2014-08-01');
+print('Collection: ', collection);
+
+// Get the number of images.
+var count = collection.size();
+print('Count: ', count);
+
+// Get the date range of images in the collection.
+var range = collection.reduceColumns(ee.Reducer.minMax(), ["system:time_start"])
+print('Date range: ', ee.Date(range.get('min')), ee.Date(range.get('max')))
+
+// Get statistics for a property of the images in the collection.
+var sunStats = collection.aggregate_stats('SUN_ELEVATION');
+print('Sun elevation statistics: ', sunStats);
+
+// Sort by a cloud cover property, get the least cloudy image.
+var image = ee.Image(collection.sort('CLOUD_COVER').first());
+print('Least cloudy image: ', image);
+
+// Limit the collection to the 10 most recent images.
+var recent = collection.sort('system:time_start', false).limit(10);
+print('Recent images: ', recent);
+