ee.Geometry.evaluate

AI-generated Key Takeaways

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

• The callback function receives the result upon success or an error message upon failure.

• The example demonstrates using evaluate with a JavaScript computedGeometry to print its GeoJSON string representation asynchronously.

• The Python API does not have an evaluate method for ee.Geometry and suggests using getInfo() instead.

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

Usage	Returns
Geometry.evaluate(callback)

Argument	Type	Details
this: computedobject	ComputedObject	The ComputedObject instance.
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.

Examples

Code Editor (JavaScript)

// Define a callback function that prints a GeoJSON string.
var printGeoJSONString = function(geometry) {
  geometry = ee.Geometry(geometry);
  print(geometry.toGeoJSONString());
};

// Create a simple computed geometry.
var computedGeometry = ee.Geometry.Point(0, 0).buffer(10);

// Evaluate the callback function that asynchronously retrieves and prints
// the GeoJSON string representation of computed geometry.
computedGeometry.evaluate(printGeoJSONString);

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.Geometry objects.
# Use ee.Geometry.getInfo() instead.