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I have looked at many libraries. Many simply don't work, others are very poorly documented.

I have a very long list of X/Y coordinates (US FT) and an associated WKID. I am trying to convert that to Lat/Lon format for mapping.

Can anyone suggest routes for completing this process in vb.net?

(the closest I've come to success is finding the esri.arcgisruntime.geometry.ProjectionConverter.convert - This seems to give me the option to suggest a wkid, x & y coord... but It's poorly documented and, unfortunately, I can't get it to do any conversions)

    Dim wkid as integer= 102100
    Dim ref As New Esri.ArcGISRuntime.Geometry.SpatialReference(wkid)
    Dim converter = New Esri.ArcGISRuntime.Geometry.ProjectionConverter()
    Dim mappoint = New Esri.ArcGISRuntime.Geometry.MapPoint(-9638404.7886215933, 3990218.2857465576, ref)
    Dim typ As Type = GetType(Esri.ArcGISRuntime.Geometry.MapPoint)
    Dim glob As New Globalization.CultureInfo("en")
    Dim result = converter.Convert(mappoint, typ, wkid, glob)

FYI, if there are some arcgis account auth required, I do not have that.

  • 1
    Precisely what did you try to do with ArcGIS Runtime, and precisely where are you stuck? This is a great opportunity to show your skills at documenting a problem that you have encountered. – PolyGeo Dec 12 '15 at 3:29
  • sorry, was quite a long day. I added the code i used with arc runtime library. – stevo22 Dec 12 '15 at 13:24
  • You left out the definition and content of wkid – Vince Dec 12 '15 at 15:27
  • I'm passing wkid to the code, it's an integer. – stevo22 Dec 12 '15 at 16:50
  • Try setting the spatial reference as well when creating the MapPoint, then the wkid in the converter will be the output wkid like EPSG:4269 (NAD 1983). The help says "The input geometry must have a spatial reference defined." – mkennedy Dec 13 '15 at 1:48
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For those interested I've managed to get this working, I'm converting from MGA meters to a local map grid projection, also in meters.

private Esri.ArcGISRuntime.Geometry.MapPoint ConvertToLocalMapGridCoords(Esri.ArcGISRuntime.Geometry.MapPoint sourceMapPoint, string projectionFile)
{
    var wkTextDest = System.IO.File.ReadAllText(projectionFile);

    var projectionConverter = new Esri.ArcGISRuntime.Geometry.ProjectionConverter();
    var result = projectionConverter.Convert(sourceMapPoint, typeof(MapPoint), wkTextDest, System.Globalization.CultureInfo.InvariantCulture);

    return (Esri.ArcGISRuntime.Geometry.MapPoint)result;
}

I'm calling it using: (You will most likely be doing something completely different here!)

const int wkidSource = 102100;
var coordPoint = newMapControl.ScreenPointToCoordPoint(e.Location);

var mouseMapPoint = Esri.ArcGISRuntime.Geometry.ConvertCoordinate.FromDecimalDegrees(string.Format("{0},{1}", coordPoint.GetY(), coordPoint.GetX()), new Esri.ArcGISRuntime.Geometry.SpatialReference(wkidSource));

var convertedMapPoint = ConvertToLocalMapGridCoords(mouseMapPoint, @"C:\abc\xyz.prj");

I'm creating a spacial reference from a well known text (ESRI Projection File .prj).

Note: coordPoint.GetY(), coordPoint.GetX() are just Decimal latitudes and longitudes respectively.

  • Thanks Kris, I'm a bit late on this because I ended up scrapping the method and going a different route. Glad you were able to get this working. I can't test, but Since you're the only answer I'll give you that. Thanks for posting this for future endeavors. :) – stevo22 Jul 19 '16 at 19:12

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