“过滤功能”位于Mapbox视口之外

Question

我有一个巨大的geojson文件，具有大约10万个要素，我想在视口外过滤要素。我尝试了多种方法：

https://github.com/mapbox/mapbox-gl-js/issues/8350和https://gis.stackexchange.com/questions/300292/how-to-load-geojson-features-outside-view-with-mapbox-gl?rq=1

但是似乎没有任何作用。我的代码是：

//Here i have already added empty geojson source
 this.instance.addSource('seats_geojson', {
            type: 'geojson',
            data: {
                "type": "FeatureCollection",
                "features": []
            }
        });

//Here i have axios call with await and i am getting all the feature's in console
//console.log(e.data.featuresCollection.features) <--- 100K features

this.instance.once('idle', () => {                      

          //Once i have the reponse ready I am setting source using setData
          this.instance.getSource('seats_geojson').setData(e.data.featuresCollection);


          //Here i am creating empty layer with above source
                         this.instance.addLayer({
                         id: "rowSelectionDup",
                         type: 'circle',
                            source: 'seats_geojson',
                            paint: {
                                'circle-color': "#4400d9"
                            },
                            filter: [
                                "in", "s", ""
                            ]
                        });
                    });

但是要做类似的事情：

this.instance.querySourceFeatures('seats_geojson', {
  sourceLayer: 'rowSelectionDup',
  filter: ['in', 's', "1C"] //This section "s" 1C is in viewport and i am getting 207 feature's
});

this.instance.querySourceFeatures('seats_geojson', {
  sourceLayer: 'rowSelectionDup',
  filter: ['in', 's', "7C"]. //This section is outside viewport and result is []
});

注意：this.instance是mapbox-gl的地图实例（新Map（config ..））

我在这里做错什么了吗？

或还有其他方法可从geojson获取特征吗？

谢谢你...

Answer 1

当我在mapbox-gl Github上发布此问题时：

https://github.com/mapbox/mapbox-gl-js/issues/9720

从当前的mapbox-gl版本开始，没有直接方法可以在视口之外提取地图项。因此，正如@ steve-bennett回答的那样，我正在获取geojson网址，另存为javascript oject中的引用，并对其应用过滤器现在对我有效...

希望有帮助...