{
  "name": "tapered_buffer",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Creates a buffer along a line geometry where the buffer diameter varies evenly over the length of the line.",
  "arguments": [ {"arg":"geometry","description":"input geometry. Must be a (multi)line geometry."},
                 {"arg":"start_width","description":"width of buffer at start of line,"},
                 {"arg":"end_width","description":"width of buffer at end of line."},
                 {"arg":"segments","optional":true,"default":"8","description":"number of segments to approximate quarter-circle curves in the buffer."}],
  "examples": [ { "expression":"tapered_buffer(geometry:=geom_from_wkt('LINESTRING(1 2, 4 2)'),start_width:=1,end_width:=2,segments:=8)", "returns":"A tapered buffer starting with a diameter of 1 and ending with a diameter of 2 along the linestring geometry."}]
}