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Not find feature by PointShape

#1

Hi,

      I can not find feature through a PointShape , My map GeographyUnit is in  Meter and  so convert it to Degree, For ex: 

      I have position ,After convert to Degree , it contains projected point (20000.9999998,20000.9999998), now it has lost some accuracy.

       so,I can not find a Feature.



Controller code : 

 [MapActionFilter]

        public string FindFeatureClick(Map map, GeoCollection args)

        {

            // X coordinate :args[0].ToString()

            // Y coordinate :args[0].ToString()

            // My map GeographyUnit is Meter so convert it to Deegree.

            ManagedProj4Projection proj = new ManagedProj4Projection();

            proj.InternalProjectionParametersString = ManagedProj4Projection.GetEpsgParametersString(3857);

            proj.ExternalProjectionParametersString = ManagedProj4Projection.GetEpsgParametersString(4326);

            proj.Open();

            PointShape position = proj.ConvertToExternalProjection(new PointShape(Convert.ToDouble( args[0].ToString()), Convert.ToDouble( args[1].ToString()))) as PointShape;

            LayerOverlay staticOverlay = (LayerOverlay)map.CustomOverlays[“ManageLayer”];  // through this layer i laod a .shp file .

            ShapeFileFeatureLayer shapeFileLayer = (ShapeFileFeatureLayer)(staticOverlay.Layers[0]);

            shapeFileLayer.Open();

            Collection<Feature> selectedFeatures = shapeFileLayer.QueryTools.GetFeaturesContaining(position, new string[] { “FIELD2”, “PRIMARY_NA”, “NAME_32_DI” });

            if (selectedFeatures.Count > 0)

            {

                //“succuess”;

            }

return “”;

}





Clientside Code :





function mapClick(e) {

        var infoPopup = Map1.popups[0];

        

        infoPopup.lonlat = e.worldXY;

        Map1.ajaxCallAction(’@ViewContext.RouteData.Values[“Controller”].ToString()’, ‘FindFeatureClick’, { x: e.worldXY.lon, y: e.worldXY.lat }, function (result) {

            Map1.redrawLayer(“HightLightDynamicOverlay”);

            infoPopup.setContentHTML(result.get_responseData());

            infoPopup.show();

        })

    }

    </script>



 @{

                    Html.ThinkGeo().Map(“Map1”, new System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage), 500)

                   .MapBackground(new BackgroundLayer(new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF"))))

                      

                    .CurrentExtent(-13939426.6371, 6701997.4056, -7812401.86, 2626987.386962)

                       

                    .MapUnit(GeographyUnit.Meter)

          

                   .CustomOverlays(overlays =>

                   {

                      

                       GoogleMapsLayer googlelayer = new GoogleMapsLayer();

                       if (Session[“IsBaseOverlayOff”] != null && Convert.ToBoolean(Session[“IsBaseOverlayOff”]) == true)

                           overlays.LayerOverlay(“GoogleMap”).Layer(googlelayer).IsBaseOverlay(true).IsVisible(false);

                       else

                           overlays.LayerOverlay(“GoogleMap”).Layer(googlelayer).IsBaseOverlay(true);



                       OpenStreetMapLayer openstreetmap = new OpenStreetMapLayer();

                       overlays.LayerOverlay(“OpenStreetMap”).Layer(openstreetmap).IsBaseOverlay(true);



                       BingMapsLayer bingmap = new BingMapsLayer();

                       overlays.LayerOverlay(“BingMap”).Layer(bingmap).IsBaseOverlay(true);



                       WorldMapKitLayer wordmap = new WorldMapKitLayer();

                       wordmap.Projection = WorldMapKitProjection.SphericalMercator;

                       overlays.LayerOverlay(“WordMap”).Layer(wordmap).IsBaseOverlay(true);

                                              overlays.LayerOverlay(“ManageLayer”).IsBaseOverlay(false).TileType(TileType.MultipleTile).IsVisibleInOverlaySwitcher(false);

                    

                   }).OnClientClick(“mapClick”)

                   .Render();            





please help for this issue.



Thanks,

Dinesh

#2

Hi Dinesh, 
  
 I guess using the GetFeaturesNearestTo instead of GetFeaturesContaining method in QueryTools might be useful. 
  
 If any questions, please feel free to let us know. 
 Thanks, 
 Johnny 


#3

Hi Johnny , 
  
       I already try GetFeaturesContaining  method for search , and it always returns a same point .  
       my code like this : 
  
              ManagedProj4Projection proj = new ManagedProj4Projection(); 
             proj.InternalProjectionParametersString = ManagedProj4Projection.GetEpsgParametersString(3857); 
             proj.ExternalProjectionParametersString = ManagedProj4Projection.GetEpsgParametersString(4326); 
             proj.Open(); 
             PointShape position = proj.ConvertToExternalProjection(new PointShape(Convert.ToDouble( args[0].ToString()), Convert.ToDouble( args[1].ToString()))) as PointShape; 
             LayerOverlay staticOverlay = (LayerOverlay)map.CustomOverlays["ManageLayer"];  // through this layer i laod a .shp file . 
             if (staticOverlay.Layers.Count <= 0) 
                 return "error"; 
             ShapeFileFeatureLayer shapeFileLayer = (ShapeFileFeatureLayer)(staticOverlay.Layers[staticOverlay.Layers.Count-1]); 
             shapeFileLayer.Open(); 
             Collection<Feature> selectedFeatures = shapeFileLayer.QueryTools.GetFeaturesNearestTo(position, GeographyUnit.Meter, 1, new string[] { "FIELD2", "PRIMARY_NA", "NAME_32_DI", "LAT","LON" }); 
             if (selectedFeatures.Count > 0) 
             { 
                 //"succuess"; 
             } 
  
  
    This is not work for me. 
  
 Thanks, 
 Dinesh

#4


Hi Dinesh,


Would you please try to use the GeographyUnit.DecimalDegree
instead GeographyUnit.Meter in the GetFeaturesNearestTo method? As I notice
from the codes the position now is under decimal degree after the projection
and the shape file should also be under decimal degree. So I guess it might be
the reason we can’t find the feature when using this method.


Please let us know if any questions on this.


Best Regards,


Johnny




#5

Hi Dinesh, 
  
 Would you please try to use the GeographyUnit.DecimalDegree instead GeographyUnit.Meter in the GetFeaturesNearestTo method? As I notice from the codes the position now is under decimal degree after the projection and the shape file should also be under decimal degree. So I guess it might be the reason we can’t find the feature when using this method. 
  
 Please let us know if any questions on this. 
 Best Regards, 
 Johnny 


#6

Hi Johnny, 
  
    I got a success to find a feature ,In my case i do not need to convert point , from decimal degree to meter , because  when i clicked on point than it  gives me point in meter. 
  
 Thanks for your support Johnny. 
  
 Thanks, 
  
 Dinesh

#7

Dinesh, 
  
 Good to hear it was solved. 
  
 Any more questions, please feel free to let us know. 
 Thanks, 
 Johnny