공지사항:
2025년 4월 15일 전에 Earth Engine 사용을 위해 등록된 모든 비상업용 프로젝트는 Earth Engine 액세스를 유지하기 위해
비상업용 자격 요건을 인증해야 합니다.
ee.Date.evaluate
컬렉션을 사용해 정리하기
내 환경설정을 기준으로 콘텐츠를 저장하고 분류하세요.
서버에서 이 객체의 값을 비동기적으로 가져와 제공된 콜백 함수에 전달합니다.
| 사용 | 반환 값 |
|---|
Date.evaluate(callback) | |
| 인수 | 유형 | 세부정보 |
|---|
다음과 같은 경우: computedobject | ComputedObject | ComputedObject 인스턴스입니다. |
callback | 함수 | 서버가 대답을 반환할 때 호출되는 function(success, failure) 형식의 함수입니다. 요청이 성공하면 success 인수에 평가된 결과가 포함됩니다. 요청이 실패하면 failure 인수에 오류 메시지가 포함됩니다. |
예
코드 편집기 (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
*/
// A server-side ee.Date object.
var dateServer = ee.Date('2021-4-30');
// Use evaluate to transfer server-side date to the client. The result is
// an object with keys "type" and "value" where "value" is milliseconds since
// Unix epoch.
dateServer.evaluate(function(dateClient) {
print('Client-side date is an object', typeof dateClient);
print('Object keys include "type" and "value"', Object.keys(dateClient));
print('"value" is milliseconds since Unix epoch', dateClient.value);
print('Client-side date in JS Date constructor', new Date(dateClient.value));
});
Python 설정
Python API 및 geemap를 사용한 대화형 개발에 관한 자세한 내용은
Python 환경 페이지를 참고하세요.
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.Date objects.
# Use ee.Date.getInfo() instead.
달리 명시되지 않는 한 이 페이지의 콘텐츠에는 Creative Commons Attribution 4.0 라이선스에 따라 라이선스가 부여되며, 코드 샘플에는 Apache 2.0 라이선스에 따라 라이선스가 부여됩니다. 자세한 내용은 Google Developers 사이트 정책을 참조하세요. 자바는 Oracle 및/또는 Oracle 계열사의 등록 상표입니다.
최종 업데이트: 2025-07-26(UTC)
[null,null,["최종 업데이트: 2025-07-26(UTC)"],[[["\u003cp\u003e\u003ccode\u003eDate.evaluate()\u003c/code\u003e retrieves the value of a server-side \u003ccode\u003eee.Date\u003c/code\u003e object and passes it to a callback function.\u003c/p\u003e\n"],["\u003cp\u003eThe callback function receives the evaluated result as an object with \u003ccode\u003etype\u003c/code\u003e and \u003ccode\u003evalue\u003c/code\u003e keys, where \u003ccode\u003evalue\u003c/code\u003e represents milliseconds since the Unix epoch.\u003c/p\u003e\n"],["\u003cp\u003eExcessive use of \u003ccode\u003eevaluate\u003c/code\u003e can impact performance due to data transfer from Earth Engine servers to the client.\u003c/p\u003e\n"],["\u003cp\u003eThe Python client library uses \u003ccode\u003egetInfo()\u003c/code\u003e instead of \u003ccode\u003eevaluate\u003c/code\u003e for asynchronous evaluation of \u003ccode\u003eee.Date\u003c/code\u003e objects.\u003c/p\u003e\n"]]],["The `Date.evaluate(callback)` method asynchronously retrieves a ComputedObject's value from the server. It uses a callback function with `success` and `failure` arguments to handle the server's response. If successful, `success` provides the evaluated result; otherwise, `failure` gives an error message. The JavaScript example transfers a server-side date to the client, revealing its \"type\" and \"value\" (milliseconds since Unix epoch). Python uses `ee.Date.getInfo()` for similar functionality.\n"],null,["# ee.Date.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| Date.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/**\n * WARNING: this function transfers data from Earth Engine servers to the\n * client. Doing so can negatively affect request processing and client\n * performance. Server-side options should be used whenever possible.\n * Learn more about the distinction between server and client:\n * https://developers.google.com/earth-engine/guides/client_server\n */\n\n// A server-side ee.Date object.\nvar dateServer = ee.Date('2021-4-30');\n\n// Use evaluate to transfer server-side date to the client. The result is\n// an object with keys \"type\" and \"value\" where \"value\" is milliseconds since\n// Unix epoch.\ndateServer.evaluate(function(dateClient) {\n print('Client-side date is an object', typeof dateClient);\n print('Object keys include \"type\" and \"value\"', Object.keys(dateClient));\n print('\"value\" is milliseconds since Unix epoch', dateClient.value);\n print('Client-side date in JS Date constructor', new Date(dateClient.value));\n});\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.Date objects.\n# Use ee.Date.getInfo() instead.\n```"]]
