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14 lines
797 B
Plaintext
14 lines
797 B
Plaintext
{
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"name": "z_min",
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"type": "function",
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"groups": ["GeometryGroup"],
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"description": "Returns the minimum z coordinate of a geometry, or Null if the geometry has no z value.",
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"arguments": [ {"arg":"geometry","description":"a geometry with z coordinate"}],
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"examples": [ { "expression":"z_min( geom_from_wkt( 'POINT ( 0 0 1 )' ) )", "returns":"1"},
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{ "expression":"z_min( geom_from_wkt( 'MULTIPOINT ( 0 0 1 , 1 1 3 )' ) )", "returns":"1"},
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{ "expression":"z_min( make_line( make_point( 0,0,0 ), make_point( -1,-1,-2 ) ) )", "returns":"-2"},
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{ "expression":"z_min( geom_from_wkt( 'LINESTRING( 0 0 0, 1 0 2, 1 1 -1 )' ) )", "returns":"-1"},
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{ "expression":"z_min( geom_from_wkt( 'POINT ( 0 0 )' ) )", "returns":"Null"}
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]
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}
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