"description": "Creates a buffer along a line geometry where the buffer diameter varies according to the m-values at the line vertices.",
"arguments": [ {"arg":"geometry","description":"input geometry. Must be a (multi)line geometry with m values."},
{"arg":"segments","optional":true,"default":"8","description":"number of segments to approximate quarter-circle curves in the buffer."}],
"examples": [ { "expression":"buffer_by_m(geometry:=geom_from_wkt('LINESTRINGM(1 2 0.5, 4 2 0.2)'),segments:=8)", "returns":"A variable width buffer starting with a diameter of 0.5 and ending with a diameter of 0.2 along the linestring geometry."}]
