topic Distance measurement is wrong in Developers Questions https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593593#M4025 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I'm using ESRI base maps and add local UTM layers in my map app. From I can read, UTM layers would be magically re-projected into ESRI's web mercator. All UTM layers shows ok, but when I use Draw tool to measure the distance between the two borders of a Township, Range and Section(1 mile) I get 1.4miles. Does the distance calculation use a different projection?&nbsp; </P><P>Does anyone have some ideas to solve the problem?&nbsp; Please help.</P><P>Thanks in advance,</P><P>li </P></BODY></HTML> Tue, 24 Nov 2015 15:32:29 GMT fuliaoli 2015-11-24T15:32:29Z Distance measurement is wrong https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593593#M4025 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I'm using ESRI base maps and add local UTM layers in my map app. From I can read, UTM layers would be magically re-projected into ESRI's web mercator. All UTM layers shows ok, but when I use Draw tool to measure the distance between the two borders of a Township, Range and Section(1 mile) I get 1.4miles. Does the distance calculation use a different projection?&nbsp; </P><P>Does anyone have some ideas to solve the problem?&nbsp; Please help.</P><P>Thanks in advance,</P><P>li </P></BODY></HTML> Tue, 24 Nov 2015 15:32:29 GMT https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593593#M4025 fuliaoli 2015-11-24T15:32:29Z Re: Distance measurement is wrong https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593594#M4026 <HTML><HEAD></HEAD><BODY><P>check the data frame and file coordinate systems from their properties... there are 1.6 km per mile so 1.4 isn't close</P></BODY></HTML> Tue, 24 Nov 2015 16:06:27 GMT https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593594#M4026 DanPatterson_Retired 2015-11-24T16:06:27Z Re: Distance measurement is wrong https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593595#M4027 <HTML><HEAD></HEAD><BODY><P>Dan,</P><P>Thanks a lot for your quick reply. I checked some samples again and tried by setting geodesic=true, which solved the calculation problem.</P><P>Have a happy Thanksgiving!</P><P>Regards,</P><P>li</P></BODY></HTML> Tue, 24 Nov 2015 18:52:18 GMT https://community.esri.com/t5/developers-questions/distance-measurement-is-wrong/m-p/593595#M4027 fuliaoli 2015-11-24T18:52:18Z