Pengumuman: Semua project nonkomersial yang terdaftar untuk menggunakan Earth Engine sebelum
15 April 2025 harus
memverifikasi kelayakan nonkomersial untuk mempertahankan akses Earth Engine.
ee.FeatureCollection.evaluate
Tetap teratur dengan koleksi
Simpan dan kategorikan konten berdasarkan preferensi Anda.
Mengambil nilai objek ini secara asinkron dari server dan meneruskannya ke fungsi callback yang disediakan.
| Penggunaan | Hasil |
|---|
FeatureCollection.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
*/
// 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);
});
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.FeatureCollection objects.
# Use ee.FeatureCollection.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 retrieves the value of a ComputedObject (like a FeatureCollection) from the Earth Engine server and passes it to a callback function.\u003c/p\u003e\n"],["\u003cp\u003eThe callback function is structured as \u003ccode\u003efunction(success, failure)\u003c/code\u003e where \u003ccode\u003esuccess\u003c/code\u003e contains the result if the request succeeds, and \u003ccode\u003efailure\u003c/code\u003e contains an error message if it fails.\u003c/p\u003e\n"],["\u003cp\u003eThis method transfers data from the server to the client, potentially impacting performance; server-side options are generally preferred.\u003c/p\u003e\n"],["\u003cp\u003eFor asynchronous evaluation of \u003ccode\u003eee.FeatureCollection\u003c/code\u003e in the Earth Engine Python client library, use \u003ccode\u003egetInfo()\u003c/code\u003e instead of \u003ccode\u003eevaluate()\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["# ee.FeatureCollection.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| FeatureCollection.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// FeatureCollection of power plants in Belgium.\nvar fcServer = ee.FeatureCollection('WRI/GPPD/power_plants')\n .filter('country_lg == \"Belgium\"');\n\nfcServer.evaluate(function(fcClient) {\n print('Client-side feature collection is an object', typeof fcClient);\n print('Feature collection object keys', Object.keys(fcClient));\n print('Array of features', fcClient.features);\n print('Properties for first feature', fcClient.features[0].properties);\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.FeatureCollection objects.\n# Use ee.FeatureCollection.getInfo() instead.\n```"]]
