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Filtrovat podle geometrie

RRubalcava

API má možnost where a metodu setWhere spolu s dalšími metodami pro časové filtrování.

L.esri.Layers.FeatureLayer | Esri Leaflet

Existuje způsob, jak také nastavit geometrii? V současné době používá hranice mapy k omezení dotazů, ale mohu to někde docela snadno přepsat?

Momentálně mohu použít Turf k vyhledávání bodů v polygonu, ale nefunguje to, pokud potřebuji zkontrolovat body mimo hranice mapy, které ještě nebyly dotazovány.

Turfjs/turf-inside · GitHub

Myslím, že bych mohl data dotazovat sám, převést je na GeoJSON a použít Turf + filtrování vlastností k vyhledávání výsledků, ale doufal jsem, že v Esri-Leaflet už existuje nějaký pracovní postup pro toto. Máte nějaké nápady?

Děkuji.

Najděte více příspěvků označených jako

Esri Leaflet

Accepted answers

PatrickArlt1

Also forgot you could also use L.esri.get to query the endpoint directly and let the server do the spatial query for you.

L.esri.get(featureLayerQueryUrl, {
  spatialRel: "esriSpatialRelIntersects",
  geometryType: "esriGeometryPoint",
  geometry: L.esri.Utils.geojsonToArcGIS(geojsonPoint)
}, function(error, response){
    var geojson = L.esri.Utils.responseToFeatureCollection(response);
});

This is dropping down pretty low into the request and utilities methods. But you will save yourself from using Turf and they are all documented in the API ref API Reference | Esri Leaflet

All comments

RRubalcava

Thanks Patrick!

I think this will work, because ultimately what I end up doing is an attribute and spatial query of the data.

I keep forgetting about L.esri.get, ha.

PatrickArlt1

Also forgot you could also use L.esri.get to query the endpoint directly and let the server do the spatial query for you.

L.esri.get(featureLayerQueryUrl, {
  spatialRel: "esriSpatialRelIntersects",
  geometryType: "esriGeometryPoint",
  geometry: L.esri.Utils.geojsonToArcGIS(geojsonPoint)
}, function(error, response){
    var geojson = L.esri.Utils.responseToFeatureCollection(response);
});

This is dropping down pretty low into the request and utilities methods. But you will save yourself from using Turf and they are all documented in the API ref API Reference | Esri Leaflet

PatrickArlt1

I get where you are coming from Rene.

You were probably hoping for something like this

L.esri.featureLayer(featureLayer, {
  spatialMethod: 'intersects',
  geometry: latlng
}).addTo(map);

Implementing this would be VERY difficult since the assumption that features are only loaded inside the current viewport is baked into Esri Leaflet all the way down to the core.

That said this did remind me of a feature I wanted to add Add additional spatial query types to L.esri.Tasks.Query · Issue #374 · Esri/esri-leaflet · GitHub.

Once this is implemented you could do something like the following to render all polygons that intersect a point.

L.esri.Tasks.query(featureLayer).intersects(latlng).run(function(error, geojson){
  // use L.GeoJSON to add features to map
});

For right now you can just use the raw L.esri.Tasks.query to query as many features as possible and use Turf on the client side for your point in polygon.

// queries all features up to the transfer limit (usually 1000-2000)
L.esri.Tasks.query(featureLayer).run(function(error, geojson){
  // now use Turf over all the geojson
});

PaulCrickard1

If you are doing it yourself, try the REST API - it will return JSON and allows you to select a geometry and a geometry type. Your URL should be

http://YourArcServerDomainName/ArcGIS/rest/services/yourFeatureName/FeatureServer/0/query

Hit that with a formatted AJAX request and get back the JSON rep of the results

Looks like the ESRI-Leaflet plugin only runs where on the whole data set. My money is on it just hitting your rest endpoint anyway so do it yourself.

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