topic HeatMapLayer based on points from FeatureLayer in ArcGIS API for Silverlight Questions

HeatMapLayer based on points from FeatureLayer

AaronWeier — Thu, 14 Jul 2011 14:45:16 GMT

Hi All -

I'm trying to create a HeatMapLayer from points in a FeatureLayer.

How do i get the geometry from the FeatureLayer (e.g. 'MapPoints') so i can add them to the 'HeatMapPoints' point collection for the HeatMapLayer?

I have a query task set up on the FeatureLayer (which works) and i have 'returnGeometry' set to true. But I can't seem to figure out how to actually access that geometry information.

Thanks for any help you can offer!!

Re: HeatMapLayer based on points from FeatureLayer

JenniferNery — Sun, 12 Dec 2021 04:04:13 GMT

Since you are using FeatureLayer, you need not run a QueryTask to get the geometry.

You can simply iterate through the graphics after UpdateCompleted.

var featureLayer = sender as FeatureLayer;
var heatLayer = MyMap.Layers["MyHeatMapLayer"] as HeatMapLayer;
foreach (var g in featureLayer.Graphics)
{
 var mp = Geometry.Clone(g.Geometry) as MapPoint;
 heatLayer .HeatMapPoints.Add(mp);
}

Re: HeatMapLayer based on points from FeatureLayer

AaronWeier — Mon, 18 Jul 2011 13:08:52 GMT

Fantastic!

Thank you Jennifer!!

Re: HeatMapLayer based on points from FeatureLayer

SureshMali — Thu, 23 Feb 2012 10:47:23 GMT

Hi,
This one helped me too, additionally i am wondering if we could add heat map for one of the attribute of data points instead of its density over a subsidiary. For e.g. drawing heat map for revenue from customer instead of number of customer distributed over the subsidiary.

Re: HeatMapLayer based on points from FeatureLayer

DominiqueBroux — Mon, 27 Feb 2012 07:05:08 GMT

Hi,
This one helped me too, additionally i am wondering if we could add heat map for one of the attribute of data points instead of its density over a subsidiary. For e.g. drawing heat map for revenue from customer instead of number of customer distributed over the subsidiary.

I don't think you can do that out of the box but you can tweak the HeatMapLayer code which is public.