topic If I draw polygons in NAD83 zone 15 and the end users open my shapefile in NAD83 zone 14. Can that create important discrepancy in the polygon's area ? in Coordinate Reference Systems Questions https://community.esri.com/t5/coordinate-reference-systems-questions/if-i-draw-polygons-in-nad83-zone-15-and-the-end/m-p/782574#M446 <HTML><HEAD></HEAD><BODY><P>Thanks</P></BODY></HTML> Mon, 17 Jul 2017 19:27:21 GMT LucRobichaud 2017-07-17T19:27:21Z If I draw polygons in NAD83 zone 15 and the end users open my shapefile in NAD83 zone 14. Can that create important discrepancy in the polygon's area ? https://community.esri.com/t5/coordinate-reference-systems-questions/if-i-draw-polygons-in-nad83-zone-15-and-the-end/m-p/782574#M446 <HTML><HEAD></HEAD><BODY><P>Thanks</P></BODY></HTML> Mon, 17 Jul 2017 19:27:21 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/if-i-draw-polygons-in-nad83-zone-15-and-the-end/m-p/782574#M446 LucRobichaud 2017-07-17T19:27:21Z Re: If I draw polygons in NAD83 zone 15 and the end users open my shapefile in NAD83 zone 14. Can that create important discrepancy in the polygon's area ? https://community.esri.com/t5/coordinate-reference-systems-questions/if-i-draw-polygons-in-nad83-zone-15-and-the-end/m-p/782575#M447 <HTML><HEAD></HEAD><BODY><P>UTM uses transverse Mercator which maintains angle/shape accuracy, not areas which would also be calculated at the planar surface, not topographic surface. I wouldn't expect the areas to be really off in zone 14 versus zone 15--since they're already "off".</P></BODY></HTML> Wed, 19 Jul 2017 19:31:05 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/if-i-draw-polygons-in-nad83-zone-15-and-the-end/m-p/782575#M447 MelitaKennedy 2017-07-19T19:31:05Z