ee.FeatureCollection.evaluate

從伺服器非同步擷取這個物件的值，並傳遞至提供的回呼函式。

用量	傳回
FeatureCollection.evaluate(callback)

引數	類型	詳細資料
這個：computedobject	ComputedObject	ComputedObject 例項。
callback	函式	伺服器傳回答案時呼叫的函式，格式為 function(success, failure)。如果要求成功，success 引數會包含評估結果。如果要求失敗，失敗引數會包含錯誤訊息。

範例

程式碼編輯器 (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);
});

Python 設定

請參閱 Python 環境頁面，瞭解 Python API 和如何使用 geemap 進行互動式開發。

import ee
import geemap.core as geemap

Colab (Python)

# The Earth Engine Python client library does not have an evaluate method for
# asynchronous evaluation of ee.FeatureCollection objects.
# Use ee.FeatureCollection.getInfo() instead.