topic Get Maps DistanceUnit? in ArcGIS API for Silverlight Questions

Get Maps DistanceUnit?

RyanCoodey — Wed, 02 Jun 2010 16:37:04 GMT

Is their a way to get a Map objects DistanceUnit? I need to feed this to the MeasureAction.MapUnits... i don't want to hard code it because it can potentially change in my app. Can i get more info, such as this, than just the WKID from the Spatial Reference?

Thanks a lot!

Re: Get Maps DistanceUnit?

DominiqueBroux — Thu, 03 Jun 2010 08:31:34 GMT

ArcGISTiledMapServiceLayer and ArcGISDynamicMapServiceLayer have both a method 'Units' which is a string such as 'esriDecimalDegrees'.
On the 'Initialized' event, you might convert this string to an esriUnits enum by using Enum.Parse. Something like :

esriUnits units = (esriUnits)Enum.Parse(typeof(esriUnits), myMapServiceLayer.Units, true);

Re: Get Maps DistanceUnit?

RyanCoodey — Fri, 10 Dec 2021 21:59:13 GMT

Great, thanks a lot dbroux. What i did is spin through the layers until I found the first occurance of this type and also where the Maps SpatialReference is equal to the Layers SpatialReference.

            if (MapUnit != DistanceUnit.Undefined)
                measureAction.MapUnits = MapUnit;
            else
            {
                //Try and get proper map units if not specified by user
                String sUnits = "";
                for (Int32 i = 0; i < Map.Layers.Count; i++)
                {
                    if (Map.SpatialReference.WKID == Map.Layers.SpatialReference.WKID)
                    {
                        if (Map.Layers is ArcGISDynamicMapServiceLayer)
                        {
                            sUnits = ((ArcGISDynamicMapServiceLayer)Map.Layers).Units;
                            break;
                        }
                        else if (Map.Layers is ArcGISTiledMapServiceLayer)
                        {
                            sUnits = ((ArcGISTiledMapServiceLayer)Map.Layers).Units;
                            break;
                        }
                    }
                }
                esriUnits units = (esriUnits)Enum.Parse(typeof(esriUnits), sUnits, true);
                DistanceUnit distanceUnit = Utility.Utility.esriUnitsToDistanceUnit(units);

                if (distanceUnit != DistanceUnit.Undefined)
                    measureAction.MapUnits = distanceUnit;
                //Default to DecimalDegrees if nothing else
                else
                    measureAction.MapUnits = DistanceUnit.DecimalDegrees;

Thank you!!!