topic Features with empty geometry in ArcGIS API for Silverlight Questions

Features with empty geometry

OrlandoCarvajal — Thu, 19 Jul 2012 15:11:33 GMT

Hi there,

I have a polygon feature class and need to store some times features with shape = null. If I insert an empty-geometry Feature from the Silverlight app, the next time I query features from that feature class, the Geometry of the other Features (with valid polygons) in the app is invalid. For example, extent displays values of NaN. I can see that the JSON response seems to be correct: the Feature comes only with Attributes.

I also wanted to update a Feature, such that its Geometry gets removed. So I set Geometry to null and call SaveEdits(), but the request doesn't send the Geometry attribute. I tried removing all rings from the polygon, and it didn't work either. Not sure if this actually screwed up my feature class.

How should I deal with this type of requirements?

Any help will be appreciated.
Orlando

Re: Features with empty geometry

OrlandoCarvajal — Thu, 26 Jul 2012 13:10:00 GMT

Hello there...
Perhaps someone from ESRI could give me an idea on what's going on here? Bug? Developer mistake? Lack of functionality? Cannot be replicated?
Thanks,
Orlando

Re: Features with empty geometry

PreetiMaske — Thu, 26 Jul 2012 16:25:59 GMT

Hi ,

I don't see any techinical issue in what you are doing. I tried both of your usecases on
http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/FeatureServer/2 and didn't run into any issue. Both cases were successful.

For updating I did
(MyMap.Layers[1] as FeatureLayer).SelectedGraphics.ToList()[0].Geometry = null;

And for adding a new feature,
private void Button_Click(object sender, RoutedEventArgs e)
        {
          Graphic g = new Graphic();
          g.Attributes["collection_time"] = DateTime.Now;
          g.Attributes["description"] = "Empty Shape";
          (MyMap.Layers[1] as FeatureLayer).Graphics.Add(g);
        }

Try a simple usecase using service above and let us know if you find any problem.