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leaflet-layerindex

Spatial index of Leaflet layer objects using RTree.js

Leaflet.LayerIndex

Efficient spatial index for Leaflet layers. It works recursively for L.FeatureGroup objects.

Requires the Magnificient RTree.js

Check out the live demo

Usage

On L.Map objects

 
    L.Map.include(L.LayerIndexMixin);
 
    var map = L.map(...);
    ...
    var layer = L.GeoJSON(data).addTo(map);
    map.indexLayer(layer);
 
    // Search visible features for example
    map.on('moveend', function () {
        var shown = map.search(map.getBounds());
        console.log(shown.length + ' objects shown.');
    });
 

Using inherited class

 
    L.IndexedGeoJSON = L.GeoJSON.extend({
        includes: L.LayerIndexMixin,
        
        initialize: function (geojson, options) {
            // Decorate onEachFeature to index layers
            var onEachFeature = function (geojson, layer) {
                this.indexLayer(layer);
                if (this._onEachFeature) this._onEachFeature(geojson, layer);
            };
            this._onEachFeature = options.onEachFeature;
            options.onEachFeature = L.Util.bind(onFeatureParse, this);
            
            // Parent initialization
            L.GeoJSON.prototype.initialize.call(this, geojson, options);
        }
    });
 
 
    var layer = L.IndexedGeoJSON(data).addTo(map);
    
    var aroundToulouse = layer.searchBuffer(L.latLng([43.60, 1.44]), 0.1);
 

Authors

Makina Corpus