Geospatial · Build and fix geometry

Poly Split

Breaks multi-part shapes into single parts, one row per part, such as the islands of a country.

Also known as: Explode multipart

How it works

Pick the Geometry column. A MultiPolygon, MultiLineString or MultiPoint becomes one row per part, with the other columns copied onto each; a single-part shape stays one row. The part keeps the input column's name but is appended after the other columns. For lists and arrays rather than geometries use Explode.

Inputs and outputs

Settings

{
  geometryColumn: string
}

Example

Split a country layer into its islands to label each one: geometry column geom. A row for Denmark with a MultiPolygon of 400 parts becomes 400 rows that all carry country = Denmark.

More in Build and fix geometry

• Make Point — Turns longitude and latitude columns into points you can map and use in other spatial nodes.
• Poly Build — Connects ordered points into a line or polygon, or wraps them in a hull or bounding box, optionally one shape per group. For example, GPS points into route lines.
• Make Valid — Repairs broken shapes, such as self-crossing polygons, so later spatial steps don't fail on them.
• Reproject — Converts geometry from one coordinate system to another. Use it before measuring or overlaying layers that come in different projections.
• Remove Holes — Fills in the holes inside polygons, keeping only the outer boundary.
• Dissolve — Merges shapes into one, or one per group, so the inner borders disappear. For example, county outlines into one outline per state. To keep totals alongside the shapes, use Aggregate's Union (dissolve).