topic Re: Statistics Filtered By Geometry in ArcGIS API for Silverlight Questions

Statistics Filtered By Geometry

DanBeatty — Mon, 01 Oct 2012 23:53:13 GMT

I am trying to calculate statistics for a feature layer. I can get the statistics for the entire layer using the sample code as a guide no problem. My question is can I filter the query based on a geometry and calculate statistics on that result. I need to be able to calculate statistics on the spatially selected subset of the feature layer. When I add the query.Geometry=SomeGeometry to the query of the querytask i get no results. Is this even possible, if so how?

Private Sub OutStatisticsDataGrid_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
Dim query As New Query()
With query

.geometry = SomeGeometry

.GroupByFieldsForStatistics = New List(Of String) _
From {"SUB_REGION"}
.OutStatistics = New List(Of OutStatistic) _
From
{New OutStatistic() With
{
.OnStatisticField = "pop2000",
.OutStatisticFieldName = "SubRegionPopulation",
.StatisticType = StatisticType.Sum
},
New OutStatistic() With
{
.OnStatisticField = "sub_region",
.OutStatisticFieldName = "NumberOfStates",
.StatisticType = StatisticType.Count
}
}
End With
queryTask.ExecuteAsync(query)
End Sub

Thanks!

Dan

Re: Statistics Filtered By Geometry

DominiqueBroux — Tue, 02 Oct 2012 06:55:29 GMT

Is your issue due to the statistics or to your geometry?

In others words, if you make a simple spatial query with your geometry as filter and without any statistics, does your query return any features?

Re: Statistics Filtered By Geometry

PeterYurkosky1 — Tue, 02 Oct 2012 08:48:23 GMT

A statistics query will not work with a spatial filter in ArcGIS Server 10.1. We've added this function to the map service at 10.1 service pack 1. See the service pack announcement here. The bug number is NIM083547.

Re: Statistics Filtered By Geometry

DanBeatty — Tue, 02 Oct 2012 09:17:26 GMT

To answer the first question, yes if I don't return statistics the spatial filter does work. Thanks for the update glad to see this addressed in sp1.