Flattens collections of collections.
Usage | Returns | FeatureCollection.flatten() | FeatureCollection |
Argument | Type | Details | this: collection | FeatureCollection | The input collection of collections. |
Examples
Code Editor (JavaScript)
// Counties in New Mexico, USA.
var counties = ee.FeatureCollection('TIGER/2018/Counties')
.filter('STATEFP == "35"');
// Monthly climate and climatic water balance surfaces for 2020.
var climate = ee.ImageCollection('IDAHO_EPSCOR/TERRACLIMATE')
.filterDate('2020-01', '2020-04');
// Calculate mean climate variables for each county per climate surface
// time step. The result is a FeatureCollection of FeatureCollections.
var countiesClimate = climate.map(function(image) {
return image.reduceRegions({
collection: counties,
reducer: ee.Reducer.mean(),
scale: 5000,
crs: 'EPSG:4326'
});
});
// Note that a printed FeatureCollection of FeatureCollections is not
// recursively expanded, you cannot view metadata of the features within the
// nested collections until you isolate a single collection or flatten the
// collections.
print('FeatureCollection of FeatureCollections', countiesClimate);
print('Flattened FeatureCollection of FeatureCollections',
countiesClimate.flatten());