公告：凡是在
2025 年 4 月 15 日前註冊使用 Earth Engine 的非商業專案，都必須
驗證非商業用途資格，才能繼續存取 Earth Engine。
ee.Geometry.evaluate
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
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 |
|---|
Geometry.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)
// Define a callback function that prints a GeoJSON string.
var printGeoJSONString = function(geometry) {
geometry = ee.Geometry(geometry);
print(geometry.toGeoJSONString());
};
// Create a simple computed geometry.
var computedGeometry = ee.Geometry.Point(0, 0).buffer(10);
// Evaluate the callback function that asynchronously retrieves and prints
// the GeoJSON string representation of computed geometry.
computedGeometry.evaluate(printGeoJSONString);
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.Geometry objects.
# Use ee.Geometry.getInfo() instead.
除非另有註明，否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權，程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
上次更新時間：2025-07-26 (世界標準時間)。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003e\u003ccode\u003eGeometry.evaluate\u003c/code\u003e is a method used to asynchronously retrieve the value of a ComputedObject (like a Geometry) from the server.\u003c/p\u003e\n"],["\u003cp\u003eIt takes a callback function as an argument, which is executed upon receiving the server response, providing either the evaluated result or an error message.\u003c/p\u003e\n"],["\u003cp\u003eThe example demonstrates using \u003ccode\u003eGeometry.evaluate\u003c/code\u003e with a callback function to print the GeoJSON representation of a computed geometry.\u003c/p\u003e\n"],["\u003cp\u003eWhile the JavaScript example showcases \u003ccode\u003eGeometry.evaluate\u003c/code\u003e, the Python library uses \u003ccode\u003eGeometry.getInfo()\u003c/code\u003e for similar functionality.\u003c/p\u003e\n"]]],["The `evaluate` method asynchronously retrieves a `ComputedObject`'s value from the server and provides it to a callback function. The callback receives a success or failure argument, with the result or error message, respectively. The example in javascript shows how it is used with a `GeoJSON` string to display the result. In python, there is not an `evaluate` method, instead you have to use the `getInfo()` method.\n"],null,["# ee.Geometry.evaluate\n\n\u003cbr /\u003e\n\nAsynchronously retrieves the value of this object from the server and passes it to the provided callback function.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------|---------|\n| Geometry.evaluate`(callback)` | |\n\n| Argument | Type | Details |\n|------------------------|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `computedobject` | ComputedObject | The ComputedObject instance. |\n| `callback` | Function | 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. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a callback function that prints a GeoJSON string.\nvar printGeoJSONString = function(geometry) {\n geometry = ee.Geometry(geometry);\n print(geometry.toGeoJSONString());\n};\n\n// Create a simple computed geometry.\nvar computedGeometry = ee.Geometry.Point(0, 0).buffer(10);\n\n// Evaluate the callback function that asynchronously retrieves and prints\n// the GeoJSON string representation of computed geometry.\ncomputedGeometry.evaluate(printGeoJSONString);\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# The Earth Engine Python client library does not have an evaluate method for\n# asynchronous evaluation of ee.Geometry objects.\n# Use ee.Geometry.getInfo() instead.\n```"]]
