ee.Dictionary.combine

Combines two dictionaries. In the case of duplicate names, the output will contain the value of the second dictionary unless overwrite is false. Null values in both dictionaries are ignored / removed.

Usage	Returns
Dictionary.combine(second, overwrite)	Dictionary

Argument	Type	Details
this: first	Dictionary
second	Dictionary
overwrite	Boolean, default: true

Examples

Code Editor (JavaScript)Colab (Python)

// A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
var dict1 = ee.Dictionary({
  B1: 182,
  B2: 219,
  B3: 443
});

// A second dictionary.
var dict2 = ee.Dictionary({
  Region: 'The Forest of Nisene Marks State Park',
  Image: 'Sentinel-2 surface reflectance (scaled by 1e4)',
  B1: -9999  // Note that the B1 key is present in both dictionaries.
});

print('Combined dictionaries (overwrite false)',
      dict1.combine(dict2, false));

print('Combined dictionaries (overwrite true)',
      dict1.combine(dict2, true));

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

import pprint

# A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
dic_1 = ee.Dictionary({
    'B1': 182,
    'B2': 219,
    'B3': 443
})

# A second dictionary.
dic_2 = ee.Dictionary({
    'Region': 'The Forest of Nisene Marks State Park',
    'Image': 'Sentinel-2 surface reflectance (scaled by 1e4)',
    'B1': -9999  # Note that the B1 key is present in both dictionaries.
})

print('Combined dictionaries (overwrite false)')
pprint.pprint(dic_1.combine(dic_2, False).getInfo())

print('\nCombined dictionaries (overwrite true)')
pprint.pprint(dic_1.combine(dic_2, True).getInfo())