ee.FeatureCollection.evaluate
Restez organisé à l'aide des collections
Enregistrez et classez les contenus selon vos préférences.
Récupère de manière asynchrone la valeur de cet objet à partir du serveur et la transmet à la fonction de rappel fournie.
| Utilisation | Renvoie |
|---|
FeatureCollection.evaluate(callback) | |
| Argument | Type | Détails |
|---|
ceci : computedobject | ComputedObject | Instance ComputedObject. |
callback | Fonction | Fonction de la forme function(success, failure), appelée lorsque le serveur renvoie une réponse. Si la requête a abouti, l'argument "success" contient le résultat évalué. Si la requête a échoué, l'argument d'échec contient un message d'erreur. |
Exemples
Éditeur de code (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);
});
Configuration de Python
Consultez la page
Environnement Python pour en savoir plus sur l'API Python et sur l'utilisation de geemap pour le développement interactif.
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.
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
Dernière mise à jour le 2025/07/26 (UTC).
[null,null,["Dernière mise à jour le 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```"]]
