topic Re: KmlLayer missing placemarks in ArcGIS API for Silverlight Questions

KmlLayer missing placemarks

TylerRothermund — Fri, 10 Feb 2012 05:24:07 GMT

I have a Kml file that I'm loading that has a few placemarks. When I view the file in GoogleEarth I can see the placemarks but they are not showing in my silverlight arcgis control; any ideas?

Using Ver 2.3.0.774

Re: KmlLayer missing placemarks

DominiqueBroux — Mon, 13 Feb 2012 10:47:03 GMT

Labelling is not supported by current implementation of the KML layer.
As the placemarks of your KML are only symbolized by a label, we end up with blank placemarks.

There is no easy workarounds. Only one I see is you to get the KML layer code and tweak it.

Re: KmlLayer missing placemarks

TylerRothermund — Mon, 13 Feb 2012 16:16:41 GMT

The whats new section in the 2.3 documentation says it supports placemarks

"The KmlLayer was rebuilt as a GroupLayer (also new in 2.3) to better represent KML content. It includes support for nested folders (layers), setting visibility of layers, placemarks, ground overlays, regions, network links, auto-refresh on network links, and more. Support for display in the Legend control has also been added."

Re: KmlLayer missing placemarks

TylerRothermund — Mon, 13 Feb 2012 23:12:32 GMT

Could you please provide a little more direction on what it is I need to tweak in the KML Layer code?

Re: KmlLayer missing placemarks

TylerRothermund — Sat, 11 Dec 2021 13:23:04 GMT

I tried using TextSymbols for the placemarks but I'm having a zIndex issue with the TextSymbols showing below the other graphics.
You can see from the remarked out code that I tried to fix the zIndex and use a KmlPlaceMarkerSymbol, but no luck.

Any Ideas???

        
        private void KmlLayer_Initialized(object sender, EventArgs e)
        {
            var regionXSymbols = ((KmlLayer)MyMap.Layers[1]).Graphics.Where(g => g.Attributes.Any(ga => ga.Value.ToString() == "Region X")).Select(g => g.Symbol as SimpleFillSymbol);
            regionXSymbols.ToList().ForEach(s => s.Fill = new SolidColorBrush(Colors.Red));

            var placemarkers = ((KmlLayer)MyMap.Layers[1]).Graphics.Where(g => g.Symbol is KmlPlaceMarkerSymbol).ToList();
            placemarkers.ForEach(p => p.Symbol = new TextSymbol() { Text = p.Attributes["name"].ToString(), FontSize=20});

            //placemarkers.ForEach(g => { g.Symbol = (KmlPlaceMarkerSymbol)Resources["KmlPlaceMarkerSymbol"]; g.SetZIndex(1000000); });

        }

Re: KmlLayer missing placemarks

DominiqueBroux — Tue, 14 Feb 2012 07:29:34 GMT

The whats new section in the 2.3 documentation says it supports placemarks

"The KmlLayer was rebuilt as a GroupLayer (also new in 2.3) to better represent KML content. It includes support for nested folders (layers), setting visibility of layers, placemarks, ground overlays, regions, network links, auto-refresh on network links, and more. Support for display in the Legend control has also been added."

Placemarks (symbols, lines, polygons) are supported but the labelling of these placemarks is not.

Re: KmlLayer missing placemarks

DominiqueBroux — Tue, 14 Feb 2012 08:33:32 GMT

I tried using TextSymbols for the placemarks

Changing symbols on the fly is a great idea 🙂

but I'm having a zIndex issue with the TextSymbols showing below the other graphics.
You can see from the remarked out code that I tried to fix the zIndex and use a KmlPlaceMarkerSymbol, but no luck.

Unfortunately DrawOrder is not supported either (sorry about that :() and changing the zindex is not working because the graphics are not in the same GraphicsLayer.

One option is to change the layer order by moving the text placemarks after the polygons.
This code should work:

private void KmlLayer_Initialized(object sender, EventArgs e) {     KmlLayer kmlLayer = sender as KmlLayer;      var placemarkers = kmlLayer.Graphics.Where(g => g.Symbol is KmlPlaceMarkerSymbol).ToList();     placemarkers.ForEach(p => p.Symbol = new TextSymbol() { Text = p.Attributes["name"].ToString(), FontSize = 20, OffsetX = 5 * p.Attributes["name"].ToString().Count(), OffsetY = 8 });      var regions = kmlLayer.ChildLayers["FEMA Regions"] as KmlLayer;     if (regions != null)     {         // move placemarks layer at the end         var placemarks = regions.ChildLayers["Placemarks"];         if (placemarks != null)         {             regions.ChildLayers.Remove(placemarks);             regions.ChildLayers.Add(placemarks); // add it at the end         }     } }

Re: KmlLayer missing placemarks

TylerRothermund — Tue, 14 Feb 2012 16:19:44 GMT

That works great, Thanks!