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[FEATURE] support aggregation of geometry
This feature adds a 'collect' aggregation method resulting in a single multipart geometry from a list of geometries. This is exposed in the expression engine via the existing aggregate() function, as well as a new collect() function.
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{ | ||
"name": "collect", | ||
"type": "function", | ||
"description": "Returns the multipart geometry of aggregated geometries from an expression", | ||
"arguments": [ | ||
{"arg":"expression", "description":"geometry expression to aggregate"}, | ||
{"arg":"group_by", "optional":true, "description":"optional expression to use to group aggregate calculations"}, | ||
{"arg":"filter", "optional":true, "description":"optional expression to use to filter features used to calculate aggregate"} | ||
], | ||
"examples": [ | ||
{ "expression":"collect( $geometry )", "returns":"multipart geometry of aggregated geometries"} | ||
] | ||
} |
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