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I need to Load Landsat 8 TOA images, get the least cloudy 2015 image. Search engine shows several images.

How can I identify least cloudy image?

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You can sort images using "CLOUD_COVER" metadata feature. The "least cloudly" images will be added as layer:

var imageCollection = ee.ImageCollection("LANDSAT/LC08/C01/T1_TOA");

var sorted = imageCollection.filterDate('2015-01-01','2015-12-31').sort("CLOUD_COVER",false);

Map.addLayer(sorted, {bands: ['B4', 'B3', 'B2'],max: 0.6},'toa reflectance');

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