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Add a 1-D Array to each feature in a collection by combining a list of properties for each feature into a 1-D Array. All of the properties must be numeric values. If a feature doesn't contain all of the named properties, or any of them aren't numeric, the feature will be dropped from the resulting collection.
Usage
Returns
FeatureCollection.makeArray(properties,name)
FeatureCollection
Argument
Type
Details
this:collection
FeatureCollection
The input collection from which properties will be selected.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-07-13 UTC."],[[["\u003cp\u003e\u003ccode\u003emakeArray()\u003c/code\u003e combines specified numeric properties of features within a FeatureCollection into a new 1-D array property.\u003c/p\u003e\n"],["\u003cp\u003eFeatures lacking any of the specified properties, or containing non-numeric values in those properties, are excluded from the output.\u003c/p\u003e\n"],["\u003cp\u003eThe resulting FeatureCollection contains the original features with an added array property holding the combined values.\u003c/p\u003e\n"],["\u003cp\u003eThe array property is named using the 'name' argument, defaulting to "array" if not provided.\u003c/p\u003e\n"]]],[],null,["# ee.FeatureCollection.makeArray\n\nAdd a 1-D Array to each feature in a collection by combining a list of properties for each feature into a 1-D Array. All of the properties must be numeric values. If a feature doesn't contain all of the named properties, or any of them aren't numeric, the feature will be dropped from the resulting collection.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------------|-------------------|\n| FeatureCollection.makeArray`(properties, `*name*`)` | FeatureCollection |\n\n| Argument | Type | Details |\n|--------------------|--------------------------|--------------------------------------------------------------|\n| this: `collection` | FeatureCollection | The input collection from which properties will be selected. |\n| `properties` | List | The properties to select. |\n| `name` | String, default: \"array\" | The name of the new array property. |\n\nExamples\n--------\n\n### Code 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\n// A list of feature properties to combine into an array\n// (power generation by year).\nvar properties = ['gwh_2013', 'gwh_2014', 'gwh_2015', 'gwh_2016'];\n\n// Add array of power-generation-by-year property to features.\nfc = fc.makeArray(properties, 'gwh_by_year');\n\nprint('FeatureCollection with array of selected properties added', fc);\nprint('See example of new \"gwh_by_year\" property', fc.first().toDictionary());\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\n### Colab (Python)\n\n```python\nfrom pprint import pprint\n\n# FeatureCollection of power plants in Belgium.\nfc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(\n 'country_lg == \"Belgium\"')\n\n# A list of feature properties to combine into an array\n# (power generation by year).\nproperties = ['gwh_2013', 'gwh_2014', 'gwh_2015', 'gwh_2016']\n\n# Add array of power-generation-by-year property to features.\nfc = fc.makeArray(properties, 'gwh_by_year')\n\nprint('FeatureCollection with array of selected properties added:',\n fc.getInfo())\nprint('See example of new \"gwh_by_year\" property:')\npprint(fc.first().toDictionary().getInfo())\n```"]]
