topic Different projections for routing and base map in ArcGIS API for Silverlight Questions https://community.esri.com/t5/arcgis-api-for-silverlight-questions/different-projections-for-routing-and-base-map/m-p/550402#M14051 <HTML><HEAD></HEAD><BODY><SPAN>I combined together three samples:</SPAN><BR /><SPAN>Routing </SPAN><A href="http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Routing">http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Routing</A><BR /><SPAN>Driving directions </SPAN><A href="http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#RoutingDirections">http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#RoutingDirections</A><BR /><SPAN>Reverse geocoding </SPAN><A href="http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#LocationToAddress">http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#LocationToAddress</A><BR /><SPAN>in order to make a routing tool, which uses my own network dataset. The route is created from points �??clicked�?? by user on the map; after geocoding points, the shortest path between them is created and later there are displayed turn by turn directions. Everything works fine besides distance measurements. All displayed distanced represents about 1/3 of real distance and I learned that this is due to different projections. On the daily basic I am using NAD_1983_StatePlane_New_York_Long_Island_FIPS_3104_Feet projection, but in order to overlay my network dataset with other data in the web application I had to reproject it to WGS_1984_Web_Mercator_Auxiliary_Sphere.&nbsp; An article </SPAN><A href="http://blogs.esri.com/Dev/blogs/arcgisserver/archive/2010/03/05/Measuring-distances-and-areas-when-your-map-uses-the-Mercator-projection.aspx">http://blogs.esri.com/Dev/blogs/arcgisserver/archive/2010/03/05/Measuring-distances-and-areas-when-your-map-uses-the-Mercator-projection.aspx</A><BR /><SPAN>tells that �??you don't have to perform your measurements in the same coordinate system used by the map. When a user submits a geometry to your application for measurement, you can re-project that geometry into a more appropriate coordinate system for measurement. The re-projected geometry is used internally for measurement only; you don't display it on the map. Once the measurement is complete, you return the correct result to the user.�?�&nbsp; I am looking for some guidance how exactly reproject my points/route into NAD 1983 to receive right measurement and in the same time have a graphic output of route, which will overlay with my WGS 1984 base maps.</SPAN></BODY></HTML> Fri, 08 Jul 2011 17:07:31 GMT JoannaLaroussi 2011-07-08T17:07:31Z Different projections for routing and base map https://community.esri.com/t5/arcgis-api-for-silverlight-questions/different-projections-for-routing-and-base-map/m-p/550402#M14051 <HTML><HEAD></HEAD><BODY><SPAN>I combined together three samples:</SPAN><BR /><SPAN>Routing </SPAN><A href="http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Routing">http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Routing</A><BR /><SPAN>Driving directions </SPAN><A href="http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#RoutingDirections">http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#RoutingDirections</A><BR /><SPAN>Reverse geocoding </SPAN><A href="http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#LocationToAddress">http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#LocationToAddress</A><BR /><SPAN>in order to make a routing tool, which uses my own network dataset. The route is created from points �??clicked�?? by user on the map; after geocoding points, the shortest path between them is created and later there are displayed turn by turn directions. Everything works fine besides distance measurements. All displayed distanced represents about 1/3 of real distance and I learned that this is due to different projections. On the daily basic I am using NAD_1983_StatePlane_New_York_Long_Island_FIPS_3104_Feet projection, but in order to overlay my network dataset with other data in the web application I had to reproject it to WGS_1984_Web_Mercator_Auxiliary_Sphere.&nbsp; An article </SPAN><A href="http://blogs.esri.com/Dev/blogs/arcgisserver/archive/2010/03/05/Measuring-distances-and-areas-when-your-map-uses-the-Mercator-projection.aspx">http://blogs.esri.com/Dev/blogs/arcgisserver/archive/2010/03/05/Measuring-distances-and-areas-when-your-map-uses-the-Mercator-projection.aspx</A><BR /><SPAN>tells that �??you don't have to perform your measurements in the same coordinate system used by the map. When a user submits a geometry to your application for measurement, you can re-project that geometry into a more appropriate coordinate system for measurement. The re-projected geometry is used internally for measurement only; you don't display it on the map. Once the measurement is complete, you return the correct result to the user.�?�&nbsp; I am looking for some guidance how exactly reproject my points/route into NAD 1983 to receive right measurement and in the same time have a graphic output of route, which will overlay with my WGS 1984 base maps.</SPAN></BODY></HTML> Fri, 08 Jul 2011 17:07:31 GMT https://community.esri.com/t5/arcgis-api-for-silverlight-questions/different-projections-for-routing-and-base-map/m-p/550402#M14051 JoannaLaroussi 2011-07-08T17:07:31Z Re: Different projections for routing and base map https://community.esri.com/t5/arcgis-api-for-silverlight-questions/different-projections-for-routing-and-base-map/m-p/550403#M14052 <HTML><HEAD></HEAD><BODY><SPAN>Somebody from Network analyst forum suggested vey neat solution without writing thousand lines of code: </SPAN><BR /><A href="http://forums.arcgis.com/threads/34288-Different-distance-in-different-projections?p=115830#post115830">http://forums.arcgis.com/threads/34288-Different-distance-in-different-projections?p=115830#post115830</A></BODY></HTML> Fri, 08 Jul 2011 17:32:07 GMT https://community.esri.com/t5/arcgis-api-for-silverlight-questions/different-projections-for-routing-and-base-map/m-p/550403#M14052 JoannaLaroussi 2011-07-08T17:32:07Z