topic Re: How to get extents of sublayers of given MapImageLayer in ArcGIS JavaScript Maps SDK Questions

How to get extents of sublayers of given MapImageLayer

DanielaPetrova — Wed, 27 Mar 2019 11:13:49 GMT

Hi, I have a MapImageLayer with a bunch of sublayers and want to perform spatial queries to get polygons that intersects among every two sublayers. How to get the extent of a sublayer to set a geometry of the query?

Re: How to get extents of sublayers of given MapImageLayer

RobertScheitlin__GISP — Wed, 27 Mar 2019 13:24:41 GMT

Daniela,

You have to use a Query and queryTask on the sublayer url. Use QueryTask.executeForExtent:

https://developers.arcgis.com/javascript/3/jsapi/querytask-amd.html#executeforextent

Re: How to get extents of sublayers of given MapImageLayer

DanielaPetrova — Fri, 29 Mar 2019 10:04:27 GMT

I'm using ArcGIS JS API 4.10

There is the function I'm using by:

function spatialQuerySublayer(sublayer, extent) {

let spatialQuery = sublayer.createQuery()

spatialQuery.geometry = extent

spatialQuery.spatialRelationship = 'intersects'

spatialQuery.outFields = ['OBJECTID']

return layer.queryFeatures(spatialQuery)

}

It is a spatial request of a sublayer against another sublayer, but I don't know how to take the extent of the sublayer which I do request againts

Re: How to get extents of sublayers of given MapImageLayer

RobertScheitlin__GISP — Fri, 29 Mar 2019 13:19:10 GMT

Daniela,

Use the subLayer.url property to do a QueryTask and then use the QueryTask.executeForExtent method.