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Unable to map my latitude and longitude to correct location

AhsanApp

Hello team esri.

I am using arcgis-runtime library 100.4.0 on android and I have tried several ways to map my marker on the points.

Point point = (Point) GeometryEngine.project(new Point(x, y), SpatialReference.create(102739));
Point point = new Point(x, y, SpatialReference.create(102739));
Point point = new Point(x, y);

and finally I am doing this:

graphicsOverlay.getGraphics().add(graphic);
graphicIds.add(position);

The value I am getting from point = Point: [38.915019, -77.009938, 0.000000, NaN] SR: 102739

but all are pointing to invalid coordinates.

Testing on device Samsung S9. Target sdk 28 and min sdk 24.

Thanks.

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Accepted answers

AhsanApp

Thanks Colin, I used the graphic constructor to pin the location so it looks like this now.

Graphic graphic = new Graphic(x, y);
graphic.setSymbol(pictureMarkerSymbol);
graphic.getAttributes().putAll(attr);

Working as expected.

All comments

AhsanApp

Thanks Colin, I used the graphic constructor to pin the location so it looks like this now.

Graphic graphic = new Graphic(x, y);
graphic.setSymbol(pictureMarkerSymbol);
graphic.getAttributes().putAll(attr);

Working as expected.

Anonymous User

Ok, let me know how you get on with Wgs84.

Also, this sample is doing most of the things you're trying to do (creating a graphic from a point and a picture marker symbol). Could be a helpful reference.

Cheers,

Trevor

AhsanApp

Hi Trevor.

Below is the complete code I am using to display the marker.

Point point = new Point(x, y, SpatialReference.create(102739));

//point = new Point(x,y);
Map<String, Object> attr = new HashMap<>();
attr.put("position", position);
PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol((BitmapDrawable) getResources().getDrawable(R.mipmap.pin_blue));
Graphic graphic = new Graphic(point, attr, pictureMarkerSymbol);
//graphic.computeCalloutLocation(point, mMapView);
graphicsOverlay.getGraphics().add(graphic);
graphicIds.add(graphicsOverlay.getGraphics().get(graphicsOverlay.getGraphics().size() - 1).getZIndex());

I hope this answers your first question.

Yes, I am targeting the Washington DC area, so I will be changing my Spatial Reference to Wgs84.

By invalid I mean the markers are not placed on the expected location.

Thanks.

Anonymous User

Hi Ahsan,

Can you share a bit more of your code? Just want to make sure I'm not misunderstanding what you're doing in the code above. Just have a few questions:

1) Those are three different points you're making in your code, you're definitely assigning them to them as the geometry to your graphic?

2) I can see the Spatial Reference (wkid-well known id) is for a very specialized coordinate system for a local coordinate system in Texas, but the x y values you give look like you're trying to use WGS84 to put a marker in the Washington DC area. Are you sure you don't mean to be using `SpatialReferences.getWgs84()`?

3) What makes it invalid? Is it not drawing where you expect or are you getting an error of some kind?

Thanks!

Trevor

ColinAnderson1

You can use the following constructor on Graphic to directly create a graphic from lat/lon values and once it is added to a graphics overlay it should display correctly in the overlay's coordinate system.

  /**    
  * Creates a new graphic with a point defined in the WGS 84 SpatialReference.    
  *    
  * @param latitude the latitude    
  * @param longitude the longitude    
  * @since 100.0.0    
*/   
public Graphic(double latitude, double longitude)

To reproject the point directly I think you need something like

Point point = (Point) GeometryEngine.project(new Point(x, y, SpatialReferences.WGS84), SpatialReference.create(102739));

so that the original project of the point is also defined as well as the target projection.

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