topic Re: Transform MapPoint to GCS in ArcGIS Pro SDK Questions

Transform MapPoint to GCS

BrianBulla — Mon, 31 Jul 2017 19:39:21 GMT

Hi,

I'm converting some code from ArcObjects to ArcPro. The following bit of code is working. It converts a point clicked on by the user, to decimal degrees, but I'm sure there is a smoother way to do this.

var mousePoint = MapView.Active.ClientToMap(e.ClientPoint);

ToGeoCoordinateParameter ddParam = new ToGeoCoordinateParameter(GeoCoordinateType.DD);
string geoString = mousePoint.ToGeoCoordinateString(ddParam);

ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show(geoString);

string[] mapPoint = geoString.Split(' ');

mapPoint[0] = mapPoint[0].Remove(mapPoint[0].Length - 1); //the N
mapPoint[1] = "-" + mapPoint[1].Remove(mapPoint[1].Length - 1); //the W; use the '-' to change it from Easting

What would the proper way be to take mousePoint and convert/transform it to DD.

Thanks,

Re: Transform MapPoint to GCS

BrianBulla — Wed, 02 Aug 2017 17:16:04 GMT

So I guess I am answering my own question, but by scouring through more of the SDK samples on GitHub, I came up with this:

protected override Task<bool> OnSketchCompleteAsync(Geometry geometry)
{

double lat;
double lng;

var coord = GeometryEngine.Instance.Project(geometry, SpatialReferences.WGS84) as MapPoint;
if (coord != null)
{
lng = coord.X;
lat = coord.Y;

Previously I was using the HandleMouseDown event, but this event gives me the Geometry of the click, which is exactly what I was looking for. Then I just have to Project it. Much simpler than my first attempt.

Hopefully this helps someone else.

Re: Transform MapPoint to GCS

Wolf — Wed, 02 Aug 2017 17:57:20 GMT

Hi Brian,

You probably noticed by now that there are some significant differences between ArcObjects and the ArcGIS Pro SDK. If you are new to the ArcGIS Pro SDK I would recommend to look at some the 'ProConcept' documents we provide on our documentation wiki: https://github.com/Esri/arcgis-pro-sdk/wiki . Needless to say samples are always helpful (which you already discovered) and so are our ProSnippets which are in essence small copy/paste ready snippets that perform a specific task. In case you haven't tried this there are quite a few technical sessions on YouTube, you can find them searching for "arcgis pro sdk for .net".