geodalib / core/src / spatialDissolve

Function: spatialDissolve()

spatialDissolve(polys): Promise<Feature<Geometry, GeoJsonProperties>>

Defined in: core/src/geometry/spatial-dissolve.ts:24

Dissolve the polygons by merging them into a single polygon

Parameters

polys

SpatialGeometry

The polygons to dissolve

Returns

Promise<Feature<Geometry, GeoJsonProperties>>

The dissolved polygon

Example

const polys = [
  { type: 'Feature', geometry: { type: 'Polygon', coordinates: [[[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]]] }, properties: { index: 0 } },
  { type: 'Feature', geometry: { type: 'Polygon', coordinates: [[[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]]] }, properties: { index: 1 } },
];
const dissolvedPolygon = await spatialDissolve(polys);

TIP

In practice, you may need to find the polygons that need to be dissolved first. For example, using a county dataset, you may need to dissolve the polygons that share the same county code.