Lines

Simplification

simplify_angular	Simplify a line or polygon by removing vertexes with small angles.
simplify_douglas_peucker	Simplify a line or polygon using a distance-based selection.
simplify_lang	Simplify a line or polygon using a look-ahead distance-based selection.
simplify_li_openshaw	Simplify a line or a polygon using a regular grid.
simplify_raposo	Simplify a line or a polygon using an hexagonal tessellation.
simplify_reumann_witkam	Simplify a line or polygon using a directional distance-based selection.
simplify_visvalingam_whyatt	Simplify a line or polygon using an area-based selection.
simplify_wang_muller	Simplify a line or polygon using a bend-reduction method.
simplify_whirlpool	Simplify a line or polygon using an epsilon-circle based selection.

Smoothing (filtering)

smooth_gaussian	Smooth a line or a polygon and attenuate its inflexion points.
smooth_platre	Smooth a line and preserve the integrity of sharp turns.
smooth_snake	Smooth a line or polygon using the snake method.
smooth_taubin	Smooth a line or polygon and prevent shrinkage.
smooth_topographic	Smooth a line or polygon and mimic hand-made cartographic generalization.
smooth_wma	Smooth a line or polygon using a low-pass filter.

Smoothing (interpolation)

smooth_catmull_rom	Smooth a line or polygon and preserve vertexes.
smooth_chaikin	Smooth a line or polygon by cutting corners.

Displacement

beams_displacement	Displace lines using the elastic beams algorithm.
propagation_crow_flies	Propagate a displacement using the method "as the crow flies".
propagation_network	Propagate a displacement along the network.