ee.FeatureCollection.aggregate_sample_sd

Page Summary

• Calculates the sample standard deviation of a specified property within a collection of objects.

• Takes a FeatureCollection and a property name (String) as arguments and returns a Number.

• Examples are provided for both JavaScript and Python to demonstrate calculating the sample standard deviation of power plant capacities.

Aggregates over a given property of the objects in a collection, calculating the sample std. deviation of the values of the selected property.

Usage	Returns
FeatureCollection.aggregate_sample_sd(property)	Number

Argument	Type	Details
this: collection	FeatureCollection	The collection to aggregate over.
property	String	The property to use from each element of the collection.

Examples

Code Editor (JavaScript)

// FeatureCollection of power plants in Belgium.
var fc = ee.FeatureCollection('WRI/GPPD/power_plants')
             .filter('country_lg == "Belgium"');

print('Sample std. deviation of power plant capacities (MW)',
      fc.aggregate_sample_sd('capacitymw'));  // 466.480889231

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)

# FeatureCollection of power plants in Belgium.
fc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(
    'country_lg == "Belgium"')

display('Sample std. deviation of power plant capacities (MW):',
        fc.aggregate_sample_sd('capacitymw'))  # 466.480889231