topic Re: Query extent without returned geometries in ArcGIS API for Flex Questions

Query extent without returned geometries

Ganael_Jatteau — Thu, 29 Jul 2010 12:39:25 GMT

Hi,

I need to get the extent of a layer with a where clause.

Right now, I use a QueryTask with returnGeometries=true, then I get the extent of all the graphics. Do you think there is a solution to do the same thing without downloading all the geometries to the client ?

Thanks!

Re: Query extent without returned geometries

EokNgo — Thu, 29 Jul 2010 18:29:48 GMT

Hi,

I need to get the extent of a layer with a where clause.

Right now, I use a QueryTask with returnGeometries=true, then I get the extent of all the graphics. Do you think there is a solution to do the same thing without downloading all the geometries to the client ?

Thanks!

Are you performing a necessary query to get a subset? If not...
You can get the extent of a layer itself using the GetDetails() method on the ArcGISDynamicLayer.
http://help.arcgis.com/en/webapi/flex/apiref/com/esri/ags/layers/ArcGISDynamicMapServiceLayer.html#getDetails%28%29

Re: Query extent without returned geometries

Ganael_Jatteau — Fri, 30 Jul 2010 09:56:29 GMT

Yes the problem is that I specify a where clause to get a subset of my layer.

Ideally, it would be nice to have the extent stored in the result when we query with "returnGeometry=false".

Re: Query extent without returned geometries

Ganael_Jatteau — Wed, 29 Sep 2010 11:40:40 GMT

A workaround is to set maxAllowableOffset with a high value. The returned geometries look like triangles but the query executes much faster. Then a GraphicUtil.getExtent() will do the job.