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Exposes simplification and smoothing algorithms to expression engine, via: - simplify(): applies Douglas-Peucker geometry simplification - simplify_vw(): applies Visvalingam-Whyatt geometry simplification - smooth(): smoothes a geometry Carto tip: use smooth along with geometry generators to minimise the typical "GIS" noded look of rendered geometries!
10 lines
647 B
Plaintext
10 lines
647 B
Plaintext
{
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"name": "simplify",
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"type": "function",
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"description":"Simplifies a geometry by removing nodes using a distance based threshold (ie, the Douglas Peucker algorithm). The algorithm preserves large deviations in geometries and reduces the number of vertices in nearly straight segments.",
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"arguments": [ {"arg":"geometry","description":"a geometry"},
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{"arg":"tolerance","description":"maximum deviation from straight segments for points to be removed"} ],
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"examples": [ { "expression":"geom_to_wkt(simplify(geometry:=geom_from_wkt('LineString(0 0, 5 0.1, 10 0)'),tolerance:=5))", "returns":"'LineString(0 0, 10 0)'"}]
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}
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