# Client-Side Geospatial Functions
This example illustrates using the Turf.js (opens new window) geospatial library to perform client-side geospatial operations.
Air quality point data is loaded as a GeoJSON feature collection using A Flo.w RDF reactive query. The query results are
transformed form points to polygons using the Turf.buffer() function. The polygons are displayed using a 3D extruded fill layer.