ee.FeatureCollection.evaluate

Asynchronously retrieves the value of this object from the server and passes it to the provided callback function.

UsageReturns
FeatureCollection.evaluate(callback)
ArgumentTypeDetails
this: computedobjectComputedObject

The ComputedObject instance.

callbackFunction

A function of the form function(success, failure), called when the server returns an answer. If the request succeeded, the success argument contains the evaluated result. If the request failed, the failure argument will contains an error message.

Examples

Code Editor (JavaScript)

/**
 * WARNING: this function transfers data from Earth Engine servers to the
 * client. Doing so can negatively affect request processing and client
 * performance. Server-side options should be used whenever possible.
 * Learn more about the distinction between server and client:
 * https://developers.google.com/earth-engine/guides/client_server
 */

// FeatureCollection of power plants in Belgium.
var fcServer = ee.FeatureCollection('WRI/GPPD/power_plants')
             .filter('country_lg == "Belgium"');

fcServer.evaluate(function(fcClient) {
  print('Client-side feature collection is an object', typeof fcClient);
  print('Feature collection object keys', Object.keys(fcClient));
  print('Array of features', fcClient.features);
  print('Properties for first feature', fcClient.features[0].properties);
});