topic GeometryEngine shapePreservingAreaOfGeometry in ArcGIS Runtime SDK for iOS Questions https://community.esri.com/t5/arcgis-runtime-sdk-for-ios-questions/geometryengine-shapepreservingareaofgeometry/m-p/542785#M4648 <HTML><HEAD></HEAD><BODY><SPAN>Hi Guys,</SPAN><BR /><BR /><SPAN>I have an app that lets the user record a polygon and writes it to a file. One of the attributes included is the Area of the polygon, i am using the following code to calculate the area:</SPAN><BR /><BR /><SPAN>[self.geometryEngine shapePreservingAreaOfGeometry:&lt;PolygonGeometry&gt; inUnit:AGSAreaUnitsHectares];</SPAN><BR /><BR /><SPAN>Although, this codes gives out the area. I am not sure if it is the right calculation.</SPAN><BR /><BR /><SPAN>Can anyone tell me if my calculation is correct? or how to accurately calculate the area of a polygon in hectares.</SPAN><BR /><BR /><SPAN>Thanks.</SPAN><BR /><BR /><SPAN>EDIT:</SPAN><BR /><BR /><SPAN>It seems that i just need to project my polygon first to an Equal Area Projected Coordinate System and then use the shapePreservingAreaOfGeometry function.</SPAN></BODY></HTML> Wed, 24 Jul 2013 15:45:57 GMT DavidMorrison1 2013-07-24T15:45:57Z GeometryEngine shapePreservingAreaOfGeometry https://community.esri.com/t5/arcgis-runtime-sdk-for-ios-questions/geometryengine-shapepreservingareaofgeometry/m-p/542785#M4648 <HTML><HEAD></HEAD><BODY><SPAN>Hi Guys,</SPAN><BR /><BR /><SPAN>I have an app that lets the user record a polygon and writes it to a file. One of the attributes included is the Area of the polygon, i am using the following code to calculate the area:</SPAN><BR /><BR /><SPAN>[self.geometryEngine shapePreservingAreaOfGeometry:&lt;PolygonGeometry&gt; inUnit:AGSAreaUnitsHectares];</SPAN><BR /><BR /><SPAN>Although, this codes gives out the area. I am not sure if it is the right calculation.</SPAN><BR /><BR /><SPAN>Can anyone tell me if my calculation is correct? or how to accurately calculate the area of a polygon in hectares.</SPAN><BR /><BR /><SPAN>Thanks.</SPAN><BR /><BR /><SPAN>EDIT:</SPAN><BR /><BR /><SPAN>It seems that i just need to project my polygon first to an Equal Area Projected Coordinate System and then use the shapePreservingAreaOfGeometry function.</SPAN></BODY></HTML> Wed, 24 Jul 2013 15:45:57 GMT https://community.esri.com/t5/arcgis-runtime-sdk-for-ios-questions/geometryengine-shapepreservingareaofgeometry/m-p/542785#M4648 DavidMorrison1 2013-07-24T15:45:57Z