Announcement: All noncommercial projects registered to use Earth Engine before April 15, 2025 must verify noncommercial eligibility to maintain Earth Engine access.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2023-10-06 UTC."],[[["\u003cp\u003e\u003ccode\u003eaggregate_total_sd\u003c/code\u003e calculates the total standard deviation of a specified property across all features within a FeatureCollection.\u003c/p\u003e\n"],["\u003cp\u003eIt takes a FeatureCollection and the property name as input, returning the total standard deviation as a number.\u003c/p\u003e\n"],["\u003cp\u003eThis function is useful for understanding the dispersion or variability of a specific property within a dataset, like the capacities of power plants in a region.\u003c/p\u003e\n"]]],["The `aggregate_total_sd` function calculates the total standard deviation of a specified property across a FeatureCollection. It takes the collection and the property name as input, returning a numerical value representing the total standard deviation. In practice, you can use the function to calculate the total standard deviation of power plant capacities (MW) in a given Feature Collection, as shown in the provided examples. Both Python and JavaScript code snippets are available.\n"],null,["Aggregates over a given property of the objects in a collection, calculating the total std. deviation of the values of the selected property.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|--------------------------------------------------|---------|\n| FeatureCollection.aggregate_total_sd`(property)` | Number |\n\n| Argument | Type | Details |\n|--------------------|-------------------|----------------------------------------------------------|\n| this: `collection` | FeatureCollection | The collection to aggregate over. |\n| `property` | String | The property to use from each element of the collection. |\n\nExamples\n\nCode Editor (JavaScript) \n\n```javascript\n// FeatureCollection of power plants in Belgium.\nvar fc = ee.FeatureCollection('WRI/GPPD/power_plants')\n .filter('country_lg == \"Belgium\"');\n\nprint('Total std. deviation of power plant capacities (MW)',\n fc.aggregate_total_sd('capacitymw')); // 462.9334545609107\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\nColab (Python) \n\n```python\n# FeatureCollection of power plants in Belgium.\nfc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(\n 'country_lg == \"Belgium\"')\n\nprint('Total std. deviation of power plant capacities (MW):',\n fc.aggregate_total_sd('capacitymw').getInfo()) # 462.9334545609107\n```"]]