Pengumuman: Semua project nonkomersial yang terdaftar untuk menggunakan Earth Engine sebelum
15 April 2025 harus
memverifikasi kelayakan nonkomersial untuk mempertahankan akses Earth Engine.
ee.Number.evaluate
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Mengambil nilai objek ini secara asinkron dari server dan meneruskannya ke fungsi callback yang disediakan.
| Penggunaan | Hasil |
|---|
Number.evaluate(callback) | |
| Argumen | Jenis | Detail |
|---|
ini: computedobject | ComputedObject | Instance ComputedObject. |
callback | Fungsi | Fungsi formulir function(success, failure), yang dipanggil saat server menampilkan jawaban. Jika permintaan berhasil, argumen keberhasilan berisi hasil yang dievaluasi. Jika permintaan gagal, argumen kegagalan akan berisi pesan error. |
Contoh
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
*/
// A server-side ee.Number object.
var numberServer = ee.Number(10.3);
// Use evaluate to transfer server-side number to the client.
numberServer.evaluate(function(numberClient) {
print('Client-side primitive data type', typeof numberClient); // number
print('Client-side number', numberClient); // 10.3
print('Client-side number used in expression', numberClient + 10); // 20.3
});
Penyiapan Python
Lihat halaman
Lingkungan Python untuk mengetahui informasi tentang Python API dan penggunaan
geemap untuk pengembangan interaktif.
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.Number objects.
# Use ee.Number.getInfo() instead.
Kecuali dinyatakan lain, konten di halaman ini dilisensikan berdasarkan Lisensi Creative Commons Attribution 4.0, sedangkan contoh kode dilisensikan berdasarkan Lisensi Apache 2.0. Untuk mengetahui informasi selengkapnya, lihat Kebijakan Situs Google Developers. Java adalah merek dagang terdaftar dari Oracle dan/atau afiliasinya.
Terakhir diperbarui pada 2025-07-26 UTC.
[null,null,["Terakhir diperbarui pada 2025-07-26 UTC."],[[["\u003cp\u003e\u003ccode\u003eevaluate()\u003c/code\u003e is a method of the \u003ccode\u003eComputedObject\u003c/code\u003e class and allows retrieving the value of the object from the Earth Engine server asynchronously.\u003c/p\u003e\n"],["\u003cp\u003eIt takes a callback function that handles the evaluated result or any potential errors encountered during evaluation.\u003c/p\u003e\n"],["\u003cp\u003eThe provided example demonstrates how to use \u003ccode\u003eevaluate()\u003c/code\u003e to transfer a server-side \u003ccode\u003eee.Number\u003c/code\u003e to the client in JavaScript.\u003c/p\u003e\n"],["\u003cp\u003eWhile JavaScript utilizes \u003ccode\u003eevaluate()\u003c/code\u003e, the Python client library recommends using \u003ccode\u003egetInfo()\u003c/code\u003e for similar asynchronous evaluation of \u003ccode\u003eee.Number\u003c/code\u003e objects.\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 argument with the result or a failure argument with an error message. It's called on a `Number` object. The examples demonstrated transfering a server-side number to the client, using the retrieved value. Python does not have this method and recommends `getInfo()` instead.\n"],null,["# ee.Number.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| Number.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.Number object.\nvar numberServer = ee.Number(10.3);\n\n// Use evaluate to transfer server-side number to the client.\nnumberServer.evaluate(function(numberClient) {\n print('Client-side primitive data type', typeof numberClient); // number\n print('Client-side number', numberClient); // 10.3\n print('Client-side number used in expression', numberClient + 10); // 20.3\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.Number objects.\n# Use ee.Number.getInfo() instead.\n```"]]
