Geospatial · Build and fix geometry

Reproject

Converts geometry from one coordinate system to another. Use it before measuring or overlaying layers that come in different projections.

Also known as: CRS, EPSG, transform

How it works

Pick the Geometry column and the two coordinate systems, From and To, as EPSG codes such as EPSG:4326 for longitude/latitude or EPSG:3857 for web maps. The geometry is transformed in place. When a code is blank or malformed the node passes the data through unchanged and the Attributes panel shows the problem. Some spatial nodes offer to reproject their right input on their own; this node is for the cases where you want the choice explicit.

Inputs and outputs

Settings

{
  geometryColumn: string
  sourceCrs: string
  targetCrs: string
}

Example

Measure parcel areas in square metres in Poland: geometry column geom, from EPSG:4326, to EPSG:2180, then Spatial Measure.

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