ee.Dictionary.size

  • The size() method returns the number of entries (key-value pairs) within an Earth Engine Dictionary object.

  • This method is useful for determining the size or length of a dictionary, such as one generated from image analysis operations.

  • Usage involves calling size() on a Dictionary object (e.g., dictionary.size()), which returns an integer representing the entry count.

  • Examples are provided in both JavaScript and Python demonstrating the application of the size() method with Earth Engine Dictionaries.

 Returns the number of entries in a dictionary.

UsageReturns
Dictionary.size()Integer
ArgumentTypeDetails
this: dictionaryDictionary

Examples

Code Editor (JavaScript)

// A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
var dict = ee.Dictionary({
  B1: 182,
  B2: 219,
  B3: 443
});

print('The number of dictionary entries', dict.size());

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)

# A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
dic = ee.Dictionary({
    'B1': 182,
    'B2': 219,
    'B3': 443
})

print('The number of dictionary entries:', dic.size().getInfo())