Simplified lines remain within a given distance of original lines. Good for thinning dense points but tends to form spikes at high simplification.

Lines are simplified by iteratively removing the point that forms the least-area triangle with two adjacent points.

Points located at the vertex of more acute angles are preferentially removed. Recommended for mapping.

Remove line intersections. Works by rolling back simplification along intersecting segments.

Automatically fix minor topology errors by snapping together points that are almost identical. Doesn't apply to TopoJSON files.

Prevent small polygons from disappearing at high simplification. Protects the largest ring of multi- ring features.

Round coordinates by a specified precision. Reduces the size of GeoJSON files but can cause intersections and collapsed shapes. Uses same units as the source file, e.g. decimal degrees for most unprojected files.