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28 lines
845 B
Plaintext
28 lines
845 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": [{
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"arg": "geometry",
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"description": "a geometry with z coordinate"
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}],
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"examples": [{
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"expression": "z_min( geom_from_wkt( 'POINT ( 0 0 1 )' ) )",
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"returns": "1"
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}, {
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"expression": "z_min( geom_from_wkt( 'MULTIPOINT ( 0 0 1 , 1 1 3 )' ) )",
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"returns": "1"
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}, {
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"expression": "z_min( make_line( make_point( 0,0,0 ), make_point( -1,-1,-2 ) ) )",
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"returns": "-2"
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}, {
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"expression": "z_min( geom_from_wkt( 'LINESTRING( 0 0 0, 1 0 2, 1 1 -1 )' ) )",
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"returns": "-1"
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}, {
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"expression": "z_min( geom_from_wkt( 'POINT ( 0 0 )' ) )",
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"returns": "NULL"
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}],
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"tags": ["coordinate", "minimum"]
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}
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