topic Re: Can't add WMS Nexrad to Map in ArcGIS API for Silverlight Questions

Can't add WMS Nexrad to Map

adamestrada — Fri, 04 Feb 2011 16:34:09 GMT

All,

For some reason I can't add the Nexrad layer to my map. The layer I am using supports 90013 but still nothing. What can I possibly be doing wrong?

http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?%20&service=WMS&request=GetCapabilities&version=1.3.0

<esri:WmsLayer ID="Nexrad" Url="http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?" Version="1.3.0" 
                           Layers="nexrad-n0r-900913-m05m" SkipGetCapabilities="True" Initialized="WmsLayer_Initialized"  Visible="True" ProxyUrl="http://localhost:1234/proxy.ashx"/>

private void WmsLayer_Initialized(object sender, EventArgs e)
        {
            try
            {
                WmsLayer nexradWmsLayer = null;
                nexradWmsLayer = (WmsLayer)Map.Layers["Nexrad"];

                // You can control the visibility of which WMS layers are displayed by adding the
                // sub-LayerID's to the String Array. 
                string[] VisibleWmsLayers = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12" };
                nexradWmsLayer.Layers = VisibleWmsLayers;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Thanks,
Adam

Re: Can't add WMS Nexrad to Map

JenniferNery — Fri, 04 Feb 2011 17:47:27 GMT

It's hard to tell where the problem is just by looking at your code. Could you try to follow the steps here to troubleshoot the WMS layer? http://blogs.esri.com/Dev/blogs/silverlightwpf/archive/2009/08/24/Troubleshooting-blank-layers.aspx

You might be able to see which web request failed in Fiddler or maybe subscribe to InitializationFailed event too.

Re: Can't add WMS Nexrad to Map

WilliamDollins — Fri, 04 Feb 2011 18:02:56 GMT

In this line of code:

string[] VisibleWmsLayers = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12" };

the array needs to be populated with the actual layer names, not string representations of the layer ordinals. So you want something like this:

string[] VisibleWmsLayers = { "nexrad-n0r-900913-m05m" };

Re: Can't add WMS Nexrad to Map

adamestrada — Sun, 12 Dec 2021 04:33:09 GMT

Bill,

That did it and it's returning the right response through firebug.

<esri:WmsLayer ID="Nexrad" Url="http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?" Version="1.3.0" 
                           Layers="nexrad-n0r-900913-m05m" SkipGetCapabilities="True" Initialized="WmsLayer_Initialized"  Visible="True" />

           WmsLayer nexradWmsLayer = null;
                nexradWmsLayer = (WmsLayer)Map.Layers["Nexrad"];

                // You can control the visibility of which WMS layers are displayed by adding the
                // sub-LayerID's to the String Array. 
                string[] VisibleWmsLayers = { "nexrad-n0r-900913-m05m" };
                nexradWmsLayer.Layers = VisibleWmsLayers;

EPSG code is 3857 "http://spatialreference.org/ref/sr-org/6864/" and my base map is web mercator. Any suggestions on that one?

Adam

Re: Can't add WMS Nexrad to Map

WilliamDollins — Fri, 04 Feb 2011 18:47:29 GMT

When I tested it, I used this base map:

http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer

Is your basemap publicly available?

Re: Can't add WMS Nexrad to Map

adamestrada — Fri, 04 Feb 2011 21:03:58 GMT

Young William,

I am using the nexrad WMS. This is what Firebug gives me.

http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?&SERVICE=WMS&REQUEST=GetMap&WIDTH=1364&HEIGHT=223&FORMAT=image/png&LAYERS=nexrad-n0r-900913-m05m&STYLES=&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&VERSION=1.3.0&CRS=EPSG:3857&BBOX=-29349775.7847534,2000000,7349775.78475336,8000000

Note the EPSG code of 3857. I think it needs to be 900913. This is what will make it display over my map but I don't know how to change it.

http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?&SERVICE=WMS&REQUEST=GetMap&WIDTH=1364&HEIGHT=223&FORMAT=image/png&LAYERS=nexrad-n0r-900913-m05m&STYLES=&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&VERSION=1.3.0&CRS=EPSG:900913&BBOX=-29349775.7847534,2000000,7349775.78475336,8000000

Ideas in that one?

Adam

Re: Can't add WMS Nexrad to Map

adamestrada — Sun, 12 Dec 2021 16:46:34 GMT

Fixed it! It has to do with the order of the map layers in the xaml. I first had the WMS rendering before the base map which did not work! Then when swapped the two around everything was golden.

Good-

 <esri:Map x:Name="Map" Loaded="Map_Loaded" Extent="-15000000,2000000,-7000000,8000000">
            
            <esri:ArcGISTiledMapServiceLayer ID="AGOLayer" Visible="True" 
                    Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />

            <esri:WmsLayer ID="Nexrad" Url="http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?" Version="1.3.0" 
                          SkipGetCapabilities="True" Initialized="WmsLayer_Initialized"  Visible="True" />

            <esri:GraphicsLayer ID="GeoRSSFeed">
                <esri:GraphicsLayer.MapTip>
                    <Grid Background="LightYellow">
                        <StackPanel Orientation="Vertical" Margin="5" >
                            <TextBlock Text="{Binding [Title]}" />
                            <TextBlock Text="{Binding [Desc]}"/>
                            <TextBlock Text="{Binding [Link]}"/>
                        </StackPanel>
                        <Border BorderBrush="Black" BorderThickness="1" />
                    </Grid>
                </esri:GraphicsLayer.MapTip>
            </esri:GraphicsLayer>
         </esri:Map>

Bad-

 <esri:Map x:Name="Map" Loaded="Map_Loaded" Extent="-15000000,2000000,-7000000,8000000">

            <esri:WmsLayer ID="Nexrad" Url="http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi?" Version="1.3.0" 
                          SkipGetCapabilities="True" Initialized="WmsLayer_Initialized"  Visible="True" />
            
            <esri:ArcGISTiledMapServiceLayer ID="AGOLayer" Visible="True" 
                    Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />

            <esri:GraphicsLayer ID="GeoRSSFeed">
                <esri:GraphicsLayer.MapTip>
                    <Grid Background="LightYellow">
                        <StackPanel Orientation="Vertical" Margin="5" >
                            <TextBlock Text="{Binding [Title]}" />
                            <TextBlock Text="{Binding [Desc]}"/>
                            <TextBlock Text="{Binding [Link]}"/>
                        </StackPanel>
                        <Border BorderBrush="Black" BorderThickness="1" />
                    </Grid>
                </esri:GraphicsLayer.MapTip>
            </esri:GraphicsLayer>
         </esri:Map>

Go figure...Thanks again for all the feedback!

Adam

Re: Can't add WMS Nexrad to Map

BenKoostra — Mon, 07 Feb 2011 12:03:12 GMT

As an alternative (to the WMS magic), you can try this AGS service for the current NEXRAD composite image -
http://gis.srh.noaa.gov/ArcGIS/rest/services/RIDGERadar/MapServer