topic Re: Displaying marker on ArcGIS map in ArcGIS API for Flex Questions

Displaying marker on ArcGIS map

SamarthGupta — Fri, 16 May 2014 11:45:48 GMT

Hi everyone,

I am building a flex desktop application for displaying some co-ordinates using ArcGIS Maps. As, i am new to ArcGIS map's, i have been going through API reference, and other things to be friendly.
When i was going through map point to display marker's on map, i wasn't able to find out in which format did map point takes the co-ordinates of the location to display marker.

I have a list of co-ordinates where i wish to show multiple markers i have northings, eastings, latitude, longitude (555388.31, 3455103.45, 31.22878668, 75.581577) respectively which correspond to location some where near "Jalandhar, Punjab, India"

Can, some knows about the format of map point?

Re: Displaying marker on ArcGIS map

KomanDiabate — Fri, 10 Dec 2021 22:34:16 GMT

I think all you need is X and Y coordinates to create mappoints.

Assuming you have you data in an arrayCollection or a tempArray you can add XY data to the map in the following fashion:

for(var i:int=0;i<tempArray.length;i++)
{
 var obj:Object=tempArray.getItemAt(i);     
 var myGraphicPoint:Graphic = new Graphic(new MapPoint(obj.X , obj.Y, new SpatialReference(3857)));
 myGraphicPoint.symbol = pointSymbol;
 myGraphicsLayer.add(myGraphicPoint);
}

Re: Displaying marker on ArcGIS map

SamarthGupta — Fri, 10 Dec 2021 22:34:18 GMT

I have tried as you suggested, and got i my markers as well. Thanks

But, the problem is that when i placed the latitudes value in x and longitudes value in y markers were scattered all over the map as if positions weren't recognized, i even tried placing my earthing value in x and northing value in y but i got the same result.

I have used this code:

protected function getLocation_resultHandler(event:ResultEvent):void
{
 if(event.result.information.rmk != "error")
 {
  filterXML = event.result as XML;
     
  var data:Array = new Array();
  for each(table1 in filterXML.information)
  {
  }
  var myGraphicPoint:Graphic = new Graphic(new MapPoint(table1.lng , table1.lat, new SpatialReference(3857)));
  myGraphicPoint.symbol = pictureMarker;
  myGraphicsLayer.add(myGraphicPoint);
 }
}

This code gets me last latitude and longitude which are in table1 as i have already written those correspond to location some where in Punjab, but in AcrGIS map marker is placed some where near Africa

Re: Displaying marker on ArcGIS map

KomanDiabate — Sat, 17 May 2014 19:50:46 GMT

This is more than likely a spatial reference issue. Make sure you are using the right Spatial reference . Also make sure X is long and Y is lat.

var myGraphicPoint:Graphic = new Graphic(new MapPoint(table1.lng , table1.lat, new SpatialReference(3857)));

Re: Displaying marker on ArcGIS map

SamarthGupta — Mon, 19 May 2014 03:35:28 GMT

How to decide which spatial reference should i use? Any, reference...