topic Different distance in different projections in ArcGIS Network Analyst Questions https://community.esri.com/t5/arcgis-network-analyst-questions/different-distance-in-different-projections/m-p/676885#M6531 <HTML><HEAD></HEAD><BODY><SPAN>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. After reprojecting my base feature class and building network dataset in a new projection my distance measurement changed. The distance which in&nbsp; NAD_1983 is 4200 feet, in WGS_1984 is 1700 feet. I know the real distance is 4200 feet, but I do not know how to make my network dataset in WGS_1984 returns true distance. Any advice?</SPAN></BODY></HTML> Thu, 07 Jul 2011 18:57:41 GMT JoannaLaroussi 2011-07-07T18:57:41Z Different distance in different projections https://community.esri.com/t5/arcgis-network-analyst-questions/different-distance-in-different-projections/m-p/676885#M6531 <HTML><HEAD></HEAD><BODY><SPAN>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. After reprojecting my base feature class and building network dataset in a new projection my distance measurement changed. The distance which in&nbsp; NAD_1983 is 4200 feet, in WGS_1984 is 1700 feet. I know the real distance is 4200 feet, but I do not know how to make my network dataset in WGS_1984 returns true distance. Any advice?</SPAN></BODY></HTML> Thu, 07 Jul 2011 18:57:41 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/different-distance-in-different-projections/m-p/676885#M6531 JoannaLaroussi 2011-07-07T18:57:41Z Re: Different distance in different projections https://community.esri.com/t5/arcgis-network-analyst-questions/different-distance-in-different-projections/m-p/676886#M6532 <HTML><HEAD></HEAD><BODY><SPAN>Thanks a lot! This solution works <span class="lia-unicode-emoji" title=":slightly_smiling_face:">🙂</span></SPAN><BR /><SPAN>Answering for your question about projection on the fly: it does not work well in my web application, so it was not a good solution.</SPAN></BODY></HTML> Fri, 08 Jul 2011 17:36:02 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/different-distance-in-different-projections/m-p/676886#M6532 JoannaLaroussi 2011-07-08T17:36:02Z