Anúncio: todos os projetos não comerciais registrados para usar o Earth Engine antes de
15 de abril de 2025 precisam
verificar a qualificação não comercial para manter o acesso ao Earth Engine.
ee.String.evaluate
Mantenha tudo organizado com as coleções
Salve e categorize o conteúdo com base nas suas preferências.
Recupera de forma assíncrona o valor desse objeto do servidor e o transmite para a função de callback fornecida.
| Uso | Retorna |
|---|
String.evaluate(callback) | |
| Argumento | Tipo | Detalhes |
|---|
isso: computedobject | ComputedObject | A instância ComputedObject. |
callback | Função | Uma função do tipo function(success, failure), chamada quando o servidor retorna uma resposta. Se a solicitação for bem-sucedida, o argumento "success" vai conter o resultado avaliado. Se a solicitação falhar, o argumento de falha vai conter uma mensagem de erro. |
Exemplos
Editor de código (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.String object fetched from a feature property.
var stringServer = ee.Feature(null, {lc: 'grassland'}).getString('lc');
// Use evaluate to transfer server-side string to client for use in ui.Label.
stringServer.evaluate(function(stringClient) {
print('Client-side primitive data type', typeof stringClient); // string
print('Client-side string', stringClient); // grassland
print('Client-side string used in ui.Label',
ui.Label('Land cover: ' + stringClient)); // Land cover: grassland
});
Configuração do Python
Consulte a página
Ambiente Python para informações sobre a API Python e como usar
geemap para desenvolvimento interativo.
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.String objects.
# Use ee.String.getInfo() instead.
Exceto em caso de indicação contrária, o conteúdo desta página é licenciado de acordo com a Licença de atribuição 4.0 do Creative Commons, e as amostras de código são licenciadas de acordo com a Licença Apache 2.0. Para mais detalhes, consulte as políticas do site do Google Developers. Java é uma marca registrada da Oracle e/ou afiliadas.
Última atualização 2025-07-26 UTC.
[null,null,["Última atualização 2025-07-26 UTC."],[[["\u003cp\u003e\u003ccode\u003eevaluate()\u003c/code\u003e retrieves the value of a server-side ComputedObject (like an \u003ccode\u003eee.String\u003c/code\u003e) and passes it to a client-side callback function.\u003c/p\u003e\n"],["\u003cp\u003eThis function is primarily used for transferring data from the Earth Engine servers to the client for tasks like displaying information in UI elements.\u003c/p\u003e\n"],["\u003cp\u003eExcessive use of \u003ccode\u003eevaluate()\u003c/code\u003e can impact performance and should be used judiciously, opting for server-side operations whenever possible.\u003c/p\u003e\n"],["\u003cp\u003eThe Python client library uses \u003ccode\u003egetInfo()\u003c/code\u003e for asynchronous evaluation instead of \u003ccode\u003eevaluate()\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["# ee.String.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| String.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.String object fetched from a feature property.\nvar stringServer = ee.Feature(null, {lc: 'grassland'}).getString('lc');\n\n// Use evaluate to transfer server-side string to client for use in ui.Label.\nstringServer.evaluate(function(stringClient) {\n print('Client-side primitive data type', typeof stringClient); // string\n print('Client-side string', stringClient); // grassland\n print('Client-side string used in ui.Label',\n ui.Label('Land cover: ' + stringClient)); // Land cover: grassland\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.String objects.\n# Use ee.String.getInfo() instead.\n```"]]
