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Filteren op geometrie

RRubalcava

Dus de API heeft een where optie en een setWhere methode met andere tijdfiltermethoden.

L.esri.Layers.FeatureLayer | Esri Leaflet

Is er een manier om ook de geometrie in te stellen? Op dit moment gebruikt het de grenzen van de kaart om queries te beperken, maar kan ik dat ergens vrij eenvoudig overschrijven?

Op dit moment kan ik door wat omwegen met Turf punt-in-polygon zoekopdrachten doen, maar het werkt niet als ik punten buiten de grenzen van de kaart moet controleren die nog niet zijn opgevraagd.

Turfjs/turf-inside · GitHub

Ik denk dat ik gewoon zelf de data kan opvragen, converteren naar GeoJSON en Turf + eigenschappenfiltering kan gebruiken om mijn resultaten te doorzoeken, maar ik hoopte eigenlijk dat er al een workflow in Esri-Leaflet was om dit te doen. Ideeën?

Bedankt.

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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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