ee.List.filter

AI-generated Key Takeaways

• The filter method is used to filter a list based on a given filter criteria.

• When filtering non-image or non-feature list items, the property name 'item' is used to refer to the elements within the ee.Filter functions.

• The filter method takes a List and a Filter as arguments and returns a List.

Filters a list to only the elements that match the given filter. To filter list items that aren't images or features, test a property named 'item', e.g., ee.Filter.gt('item', 3).

Usage	Returns
List.filter(filter)	List

Argument	Type	Details
this: list	List
filter	Filter

Examples

Code Editor (JavaScript)

// An ee.Image list object.
var list = ee.List([1, 2, 3, null, 6, 7]);

// Filter the list by a variety of conditions. Note that the property name
// 'item' is used to refer to list elements in ee.Filter functions.
print('List items equal to 3',
      list.filter(ee.Filter.eq('item', 3)));
print('List items greater than 4',
      list.filter(ee.Filter.gt('item', 4)));
print('List items not null',
      list.filter(ee.Filter.notNull(['item'])));
print('List items in another list',
      list.filter(ee.Filter.inList('item', [1, 98, 99])));
print('List items 3 ≤ 𝑥 ≤ 6',
      list.filter(ee.Filter.and(
        ee.Filter.gte('item', 3),
        ee.Filter.lte('item', 6))));

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)

# An ee.Image list object.
ee_list = ee.List([1, 2, 3, None, 6, 7])

# Filter the list by a variety of conditions. Note that the property name
# 'item' is used to refer to list elements in ee.Filter functions.
print('List items equal to 3:',
      ee_list.filter(ee.Filter.eq('item', 3)).getInfo())
print('List items greater than 4:',
      ee_list.filter(ee.Filter.gt('item', 4)).getInfo())
print('List items not None:',
      ee_list.filter(ee.Filter.notNull(['item'])).getInfo())
print('List items in another list:',
      ee_list.filter(ee.Filter.inList('item', [1, 98, 99])).getInfo())
print('List items 3 ≤ 𝑥 ≤ 6:',
      ee_list.filter(ee.Filter.And(
          ee.Filter.gte('item', 3),
          ee.Filter.lte('item', 6))).getInfo())