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buffer
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buffer
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{
"name": "buffer",
"type": "function",
"groups": ["GeometryGroup"],
"description": "Returns a geometry that represents all points whose distance from this geometry is less than or equal to distance. Calculations are in the Spatial Reference System of this geometry.",
"arguments": [ {"arg":"geometry","description":"a geometry"},
{"arg":"distance","description":"buffer distance in layer units"},
{"arg":"segments","optional":true,"default":"8","description":"number of segments to use to represent a quarter circle when a round join style is used. A larger number results in a smoother buffer with more nodes."},
{"arg":"cap","optional":true,"default":"'round'","description":"end cap style for buffer. Valid values are 'round', 'flat' or 'square'"},
{"arg":"join","optional":true,"default":"'round'","description":"join style for buffer. Valid values are 'round', 'bevel' or 'miter'."},
{"arg":"miter_limit","optional":true,"default":"2","description":"miter distance limit, for use when the join style is set to 'miter'"}],
"examples": [ { "expression":"buffer($geometry, 10.5)", "returns":"polygon of the current feature's geometry buffered by 10.5 units"}]
}