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Flex API 2.4 KML support added - need sample of how to add kml

NR-DonCoppleGISS

I see kml support added and in the documentation it says the <layer> tag now supports type = "kml".

I have been trying to add that as a layer in my config.xml file as such:
<Layer> label="Mesowest Observations" type="kml" visible="false"
            url="http://www.srh.noaa.gov/gis/kml/mesowest/mesowestlink.kml"/>

I get an error on load Fault code: Client.CouldNotDecode
                             Fault info: Error #1085
                             Fault details: null

I cannot find any documentation on how to envoke the new layer easily, looks like I could go in and code something to load it, maybe. Anyone else figured out how to add the kml layers? I am combining kml and GIS layers.

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DanielKonde

I am having problems accessing the .swc file to import. I have to

import com.esri.viewer.AppEvent;

import com.esri.viewer.components.toc.TOC;

import com.esri.viewer.components.toc.tocClasses.TocKmlFolderItem;

import com.esri.viewer.components.toc.tocClasses.TocKmlNetworkLinkItem;

import com.esri.viewer.components.toc.tocClasses.TocMapLayerItem;

My end result will be to load KML into Flexxviewer. Where can I find the correct library?

BjornSvensson

Clarification - How To Report a "problem" KML

Option A. Verify that it works in ArcGIS.com Viewer
Go to http://www.arcgis.com/home/webmap/viewer.html and try to add it there (Add -> Add Layer from Web -> KML). If it fails there too, click the "Contact Us" link on the bottom left of the page and report that the KML doesn't work. Don't forget to include the URL of the KML file. If it works on ArcGIS.com Viewer, but not with Flex API or Flex Viewer, see option B and C below.

Option B. Report it to Esri Support - http://support.esri.com.

Option C. Report it on the Esri Forums

Requirements/Limitations:

Your KML needs to be publicly accessibly.

Known issues:

If your KML contains areas outside of Web Mercator scope (i.e North pole, South pole) as in some of the NOAA feeds, then it will fail if your Map is in Web Mercator. If your basemap is in geographic, it works fine. This issue will be fixed in the next version.

NR-DonCoppleGISS

So I am close to adding th eKML widget. It will allow you to add one kml, overwrite it, and deleted it from the map and layer list. I think if I could figure out how to program an array now, then you could add our remove multiple kml layers at the same time. I have a public var then one that needs the array so kmlLayer I think to add multiples. I have attached the code for adding, removing the 1 kml. Any coders that could help me with the array, I would appreciate it. I will be happy to share the widget, and uncompiled code when I get it completed.
Thanks,

Here's the code:

import com.esri.ags.layers.KMLLayer;
   import com.esri.ags.layers.Layer;
   import com.esri.ags.layers.supportClasses.KMLFeatureInfo;
   import com.esri.ags.layers.supportClasses.KMLFolder;
   import com.esri.ags.layers.supportClasses.LayerInfoWindowRenderer;
   import com.esri.viewer.AppEvent;
   import com.esri.viewer.components.toc.TOC;
   import com.esri.viewer.components.toc.tocClasses.TocKmlFolderItem;
   import com.esri.viewer.components.toc.tocClasses.TocKmlNetworkLinkItem;
   import com.esri.viewer.components.toc.tocClasses.TocMapLayerItem;

   import flash.display.Sprite;

   import flashx.textLayout.events.SelectionEvent;

   import mx.events.ValidationResultEvent;
   import mx.messaging.Consumer;
   import mx.rpc.http.Operation;
   import mx.utils.object_proxy;
   import mx.validators.ValidationResult;
   import mx.validators.Validator;

   import widgets.InfoTemplates.SimpleInfoWinWidget;

   private const ICON_URL:String = "assets/images/";
   private var KMLLocation:String;
   public var kmlLayer:KMLLayer= new KMLLayer();
   //this function called when the widget's configuration is loaded

   private function init():void
   {
    if (configXML) // checking for valid content in the configuration file
    {
     lbl.text = configXML.content || getDefaultString("KMLLayerWidgetContent");
    }
    KMLLayerWgt.addTitlebarButton(ICON_URL + "Google-Earth-24.png","Load KML",showstateLoadKML);
    KMLLayerWgt.addTitlebarButton(ICON_URL + "Google-Earth-24rmv.png","Remove KML",showstateDelete);
   }

   private function showstateLoadKML():void
   {
    this.currentState="KMLInput";
    KMLLayerWgt.selectedTitlebarButtonIndex = 1;
   }
   private function showstateDelete():void
   {
    this.currentState="removeKML";
    KMLLayerWgt.selectedTitlebarButtonIndex = 0;
   }
//todo figure out an array to add a new kml, or add a field to ask if you want new?
   public function LoadKML():void
   {
    kmlLayer.url = KMLAddress.text;
    kmlLayer.name = kmlname.text;
    map.addLayer(kmlLayer);
    this.ClearForm();
   }

   public function ClearForm():void
   {
    KMLAddress.text="";
    kmlname.text="";
   }

   private function removeLayer():void
   {
    map.getLayer(kmlLayer.name);
    map.removeLayer(kmlLayer);
   }

NR-DonCoppleGISS

OK Bjorn,
I tried the second approach, still no lcuk, the online map will not bring up networked links, I think it states that in the load file from Web, and KML types that can be loaded link.

So still no luck. In my application, it will populate the TOC and even have the drill down in the menu all the way to the data, but the data comes up as a ? in the TOC and no information is displayed on the map. I did include the links in the contact us message, and they are here in my earlier messages.

Hopefully someone will get back to me on the rest of my post so I can get my widget up and running, it is running, just need it to be better.

Thanks,
Don

BjornSvensson

... look foward to better KML support when it comes out.

If you had a KML file that didn't work properly, please try again. The KML support has been improved. You don't need to do anything to take advantage of it. No need to recompile etc. It is the underlying utility service we are using that has been updated.

BTW, if you have a URL that still doesn't work with the 2.4 Flex API/Viewer, go to http://www.arcgis.com/home/webmap/viewer.html and try to add it there (Add -> Add Layer from Web -> KML). If it fails there too, click the "Contact Us" link on the bottom left of the page and report that the KML doesn't work. Don't forget to include the URL of the KML file.

NR-DonCoppleGISS

OK,
So I have created a widget that will allow a user to add a kml (attached screenshot). It works with the ones that work, and others will not because of bugs (same ones I have mention above from NOAA). Hopefully the bugs will be worked out in the next release, or patch.

Anyway, with my widget, it will load the kml as a layer, but assigns it a name in the layer list (see screen shot). How do I go about giving the user the ability to change the layer title in the layerlist. I have been trying to find the code that will do that. The screen shot show lightning data loaded from the BLM as a kml. Can anyone help me out?

Another thing I would like to add would be to delete that layer from the list also, since it may be a temporary layer (kind of like the add bookmark, I can delete added bookmarks, but not the programmed ones.

Thanks,
Don

lightning screenshot.gif

NR-DonCoppleGISS

Thanks Robert,
I plan on doing that, at least they are aware of a few bugs to work through and it is getting closer. I will deploy my App without it for now, and look foward to better KML support when it comes out.
If you were working on a Widget, let me know if you get it done. I think I may continue to look at the code at my end as well.

Thanks,
Don

RobertScheitlin__GISP

Don,

I tested several links for the http://www.srh.noaa.gov/gis/kml site and could not get a one of them to work either but I have had good success with other kmls so I would say for the time being look else where for kml data you can use, as it is unlikely that the issue will get resolved without another release of the API and or viewer.

NR-DonCoppleGISS

Sarthak,
Just a quick update to my comment about the popup for the kml. I opened the same western rr kml file in GE, it gives much more information than the popup that does work in flex. So I think it is the way that is being parsed also. I hope to get the other stuff working, but also need the pop ups to work as well. A lot of the data that are included with the KML's I am trying to load are included in the pop up that comes up with the point on the map.

I included a screen shot of the same rr kml that comes with the example viewer kml, but it shows much more data in the pop up. Any ideas on how to create the pop up?

Maybe Robert is working on this with his Widget as well though. Sorry to keep bugging you, but I am in need of this to work.....

Still just have a (?) for my kml layers too, haven't figured that out, no display on the map, but is in the TOC. Could it be something with the map datum, and kml file differences?

Thanks,
Don

WesternRRkml.png

ErikArchibald

sdat,

I've noticed that the KML file must be Public in order for parsing. I work in an area that might require some sensitive kml data, any plans at ESRI to provide some local parsing?

Thanks.

I'm having this problem too. I'd like to have all my KML hosted on an intranet. Any ideas for a work-around?

NR-DonCoppleGISS

Thanks for working on this too Robert. Hope the bugs get worked out soon.

Thanks also for letting me know where to put the code. Will try that adn see what happens.

OK, I implemented to code change, which brings up the TOC, however, the points come up as (?). So not sure if the kml is being parsed correctly or not. I will have to look through the code to see which part returns a (?) if there is an error I guess. So it looks as if there is still a bug. My screen shot is below, and I am working with the publically availible kml here:http://www.srh.noaa.gov/gis/kml/SpotForecast/spotLink.kml

Here's my screen shot, so you can see TOC now works, just not being rendered on the map.

legend.png

RobertScheitlin__GISP

Sarthak,

So this is what I am working on. I am adding KML Layer support to my TOC Widget that integrates legend swatches and TOC and I now have it working well. The one issue that remains (besides kml symbology looks much better in GE) is that if the KML does not specify a default symbol than you guys give it a default symbology (which is fine), but then you never provide anything to the getLegendInfos function. Just thought you should know from a developers perspective what is not working.

PreviewKMLtoc.jpg

PatrickTruitt

sdat,

I've noticed that the KML file must be Public in order for parsing. I work in an area that might require some sensitive kml data, any plans at ESRI to provide some local parsing?

Thanks.

SarthakDatt

Did it render any points for you in your test. I can open it in GE, so I know the server is working for GE, but not in Flex.

No it did not, as "our" server is not returning any renderer info. This seems to be a bug. You can try your kml on arcgis.com and see the same result.

Do I use the code you provide in the main application file?

No, you would not be changing the main application file. In you viewer source code, you can go to com->esri->viewer->components->toc->tocClasses package and find TOCMapLayerItem.as. Now simply replace the methods in this file with the code I provided.

NR-DonCoppleGISS

Did it render any points for you in your test. I can open it in GE, so I know the server is working for GE, but not in Flex.

I also appreciate the code, but am a beginner, so not sure how to impliment the code yet. I have modified the config file, and have modified a couple of widgets, but that is as far as I have gotten with code experimentation.

Do I use the code you provide in the main application file? Just not sure how to use it. Sorry for my ignorance on the matter. I will continue to hack away until I figure it out.

Thanks,
Don

SarthakDatt

One more point I noticed, no pop-ups in the included kml samples, of the online sample map. So if I click on the western railroads kml on the sample map, it does nothing. So if those popups need seperate xml files in the popups menu, and example of how to create those for a kml would be nice, once the kml is working.

You do not have to do anything specific, the kml layer comes with the popup info. I can see the popup on the western railroads kml at my end. I must agree the popups in this case are not well configured 🙂 :

Screen shot 2011-08-03 at 10.26.37 AM.png

SarthakDatt

Don,

As I mentioned in my earlier post, with the current FV 2.4 you would not see the network links whose default visibility is 0 unless you make that change to the TOCMapLayerItem.as

See the attached image, shows how the toc would look after the change is made. You would not have to manually set the visibility of each network link. It works fine with nested network links as well.

Regarding the features not shown on the map, I think there is a problem in the server not returning any renderer information. I am looking more into that. You can see the same by looking at the response in Firebug.

Screen shot 2011-08-03 at 9.56.41 AM.png

NR-DonCoppleGISS

Sarthak,
I have modified the kml files and posted to my own server with the visibility set to 1 as you described. I don't think 2.4 handles networked kml links. Changing the value to 1 does make a layer show up in the TOC as if there were something there. However, it only lists the first network link. So the original KML: http://www.srh.noaa.gov/gis/kml/raws/rawslink.kml , I changed the visibilty tag to 1 for each of the network linked elements. I then saved my modified kml to a website and linked that in my config.xml. I then went into one of the subelement links http://www.srh.noaa.gov/gis/kml/raws/rawsTfLink.kml and change the visibility tag to 1 again, and again posted to my own website, this brought up the layer in the TOC again for temp in this case, but still nothing on the map. So rewriting the kml to visibilty 1 helped add it to the TOC, but did not visually display the data on the map. All my modification to the kml were visible using GE, so the KMLs are structured correctly even with my rewrites, and that allowed those element to automatically open in GE. They are in the TOC of my Flex App, but not visible on map.

I need the kml functionality to complete and deploy my Flex Application which is why I have posted so much about kml on the forum. I have not tried your work around yet, as I haven't figured out where to code that. I have modified a few widgets to fit my needs so understand modifying some widgets, but just havn't had the time to code a new widget.

Robert, have you tried the links that I posted earlier to see if they work with the modifications suggested? I see you said the one from Alaska didn't work, so didn't want to put in a bunch of time to have the same happen. Can you give me any direction to how you used the code to get some of the working if they do? I still think a widget would be nice, with an xml that would be able to specifiy the url to the kml file, much like GEORss works now.

One more point I noticed, no pop-ups in the included kml samples, of the online sample map. So if I click on the western railroads kml on the sample map, it does nothing. So if those popups need seperate xml files in the popups menu, and example of how to create those for a kml would be nice, once the kml is working. Like I say, I am in need of this functionality to deploy my project.

Thanks.....

SarthakDatt

Robert,

Seems to work fine for me:

Screen shot 2011-08-03 at 9.27.21 AM.png

RobertScheitlin__GISP

Sarthak,

I got a url for you that your Flex Viewer workaround does not seem to work for:

http://puff.images.alaska.edu/kml_files/volcano/Puff_monitored_Bezymianny.kml

Any Suggestions?

NR-DonCoppleGISS

Thanks,
I will give it a try and reply back here if that doesn't work. Just for your note, I modified the kml to visibility of 1 and reposted it to my own website to try that. It now opens the TOC, but then will not populate anything point wise. Shows a ? in my TOC window. I assume that is from the network link, however the network link has visibility set to 1 (this is the spot2 kmz file).

I will try your method to see if that gives me different results.

Thanks,
Don

SarthakDatt

Maybe this would help : http://help.arcgis.com/en/webapps/flexviewer/help/index.html#/Create_your_own_widget/01m300000010000000/

You would add KMLLayer as any other layer is added to the map:


var kmlLayer:KMLLayer = new KMLLayer();
kmlLayer.url = // url to kml document                    
map.addLayer(kmlLayer);

NR-DonCoppleGISS

This helps greatly, thanks for providing that explanation. It has been frustrating to figure out. I am still trying to figure out how to create a widget to load the kml, and I am sure you code will help, just not sure how to create the widget, or where to put the code in yet.

I think a widget, much like the GEORss widget would be a good answer that could easily be thrown out in the code gallery. Someone let me know if you're working on that so I don't waste my time trying different things.

Thanks again for the reply, and I look forward to updates, patches, or a widget to do this......

SarthakDatt

Hey Don,

Thanks for reporting this. There are couple of issues here.

The kml(http://www.srh.noaa.gov/gis/kml/SpotForecast/spotLink.kml) contains 1 screen overlay and 1 network link(pointing to http://www.srh.noaa.gov/gis/kml/SpotForecast/spot2.kmz).

- There is a bug in Flex Viewer 2.4, where the TOC does not show a network link which has default visibility of 0(false), hence not allowing you to turn it on(make the request). If you are working with the viewer code base you can make the following change to TOCMapLayerItem.as(replace createKMLFolderTocItem() and createKmlNetworkLinkTocItem()):

private static function createKmlFolderTocItem(parentItem:TocItem, folder:KMLFolder, folders:Array, layer:KMLLayer):TocKmlFolderItem
    {
        var item:TocKmlFolderItem = new TocKmlFolderItem(parentItem, folder, layer);

        // Handle any sublayers of a group layer
        if (folder.subFolderIds && folder.subFolderIds.length > 0)
        {
            var lookInFeatureInfos:Boolean = true;
            for each (var childId:Number in folder.subFolderIds)
            {
                var childFolder:KMLFolder = findFolderById(childId, folders);
                if (childFolder)
                {
                    item.addChild(createKmlFolderTocItem(item, childFolder, folders, layer));
                }
            }
        }
        else if (folder.featureInfos && folder.featureInfos.length > 0)
        {
            for each (var featureInfo:KMLFeatureInfo in folder.featureInfos)
            {
                if (featureInfo.type == KMLFeatureInfo.NETWORK_LINK)
                {
                    var networkLink:KMLLayer = layer.getFeature(featureInfo) as KMLLayer;
                    item.addChild(createKmlNetworkLinkTocItem(item, networkLink, layer));
                }
            }
        }
        return item;
    }

    private static function createKmlNetworkLinkTocItem(item:TocItem, networkLink:KMLLayer, layer:KMLLayer):TocKmlNetworkLinkItem
    {
        var tocKmlNetworkLinkItem:TocKmlNetworkLinkItem = new TocKmlNetworkLinkItem(item, networkLink, layer);
        if (networkLink.loaded)
        {
            createKMLLayerTocItems(tocKmlNetworkLinkItem, networkLink); // as network link is also a type of KMLLayer
        }
        else
        {
            networkLink.addEventListener(LayerEvent.LOAD, layerLoadHandler);
        }

        function layerLoadHandler(event:LayerEvent):void
        {
            createKMLLayerTocItems(tocKmlNetworkLinkItem, networkLink);
        }

        return tocKmlNetworkLinkItem;
    }

- The screen overlay would still not be shown, it is a bug in the api because of the sizeX and sizeY values being -1 and we are looking to fix that.

This applies to the other kml samples that you have been trying as well.

Hope this helps.

NR-DonCoppleGISS

The kml link in my last post still refused to work in flex 2.4. I was able to find samples in the apps folder for those of you who want a sample config, and finally located that on the websites as well, so I appologize for that lack of looking. However, with that said, I cannot get any of the freely posted kml link on the NOAA website to work in Flex. I can load some simple kml files, and load the feed from Inciweb fire incidents (although it is just the points and none of the information associated). I noticed some of these have some CDATA elements that are parsed by the kml viewer. I did notice some of the additional links within a kml could not be loaded (http://www.srh.noaa.gov/gis/kml/raws/rawslink.kml) for example. When opened in ArcGIS Explorer you have to turn on the layers you want to see (Temp & RH for example), but the points appear. The Spot Forecast example in my last post will work in ArcGIS Explorer, and Arc GIS Desktop, but not in my Flex Application. Is this a bug, of does anyone have any hints on how to load those. (Is a seperate KML widget needed to properly parse and display.

I am glad it is starting to support some KML data, but need some help here.

There are a variety of US Govt. NOAA kml data here:http://www.srh.noaa.gov/gis/kml/
I am using some thing from NOAA from thier GIS services, however not all are displayed. Most are KML.

Please reply......

NR-DonCoppleGISS

Ok was able to figure out the config file error here is the correct format:
<layer label="Spot Forecast" type="kml" visible="true"
url="http://www.srh.noaa.gov/gis/kml/SpotForecast/spotLink.kml"/>

However, it isn't working. I believe the kml has the autorefresh mode set as well, maybe that is the problem. It will not load. The above KML is spot weather forecasts for the United States. I did notice that I do not have the newest Flex SDK, so will load that and try again. Do you think that would cause the error? Although the kml layer load is in com.esri sdk.....If it works I will update, or delete this thread. P.S. The copper mines kml included in the apps.config-kml.xml loads fine, the other layers do not (included with the 2.4 flex app).

Thanks,
Don

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