Buffer Generator

Click the map to place a point, set the buffer distance, and generate a zone around it.

Buffer Distance:

⭕Click the map to place a point, then click Generate Buffer.

About This Tool

The Buffer Generator creates a circular exclusion or influence zone of a specified radius around any point on the map. Buffers are used in proximity analysis — for example, defining a noise impact zone around an airport, a service area around a facility, or a safety perimeter around a hazard.

Input

A center point placed on the map, a numeric distance value, and a unit (metres, kilometres, or miles). The buffer updates immediately when any parameter is changed.

Output

A geodesic buffer polygon rendered on the map with a transparent blue fill and outline. The polygon can be downloaded as GeoJSON or KML, or the GeoJSON can be copied to clipboard. Area, perimeter, and radius statistics are shown below the map.

Key Concepts

Geodesic buffer: A circle of constant real-world ground distance drawn on the curved Earth surface, computed using the WGS84 spheroid model. Unlike a Euclidean circle drawn on a flat projected map — which stretches at higher latitudes — a geodesic buffer maintains a true constant radius in all directions from the center. The polygon is approximated by 64 vertices; the maximum geometric error is less than 0.1% of the radius.
GeoJSON output: A single Polygon feature with a coordinates array of [longitude, latitude] pairs conforming to RFC 7946. Compatible with QGIS, PostGIS, Mapbox, and most GIS platforms.
KML output: A <Polygon> placemark styled with a 2-pixel line and no fill, suitable for import into Google Earth and Google Maps. Colors are encoded in KML's AABBGGRR format.