ee.Number.evaluate

  • The evaluate method asynchronously retrieves the value of an object from the server and passes it to a provided callback function.

  • The callback argument is a function that is called when the server returns an answer, receiving either the successful result or an error message.

  • In JavaScript, evaluate can be used to transfer a server-side ee.Number object to the client for further processing.

  • The Earth Engine Python client library does not have an evaluate method for asynchronous evaluation of ee.Number objects; getInfo() should be used instead.

Asynchronously retrieves the value of this object from the server and passes it to the provided callback function.

UsageReturns
Number.evaluate(callback)
ArgumentTypeDetails
this: computedobjectComputedObjectThe ComputedObject instance.
callbackFunctionA 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.

Examples

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
});

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

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.