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I was going to go back and reference some of the things I learned from Ben Smith and then I looked and saw it was........ you. Long time, no see. I have not noticed a difference. From what little research I've done, it has more to do with the control elements of the datum. If you had a feature class of geodetics, they would perhaps be impacted. "As part of continuing efforts to improve the NSRS, on June 30, 2012, NGS completed the National Adjustment of 2011 Project. This project was a nationwide adjustment of NGS "passive" control (physical marks that can be occupied with survey equipment, such as brass disk bench marks) positioned using Global Navigation Satellite System (GNSS) technology. The adjustment was constrained to current North American Datum of 1983 (NAD 83) latitude, longitude, and ellipsoid heights of NGS Continuously Operating Reference Stations (CORS <http://www.ngs.noaa.gov/CORS/>). The CORS network is an "active" control system consisting of permanently mounted GNSS antennas, and it is the geometric foundation of the NSRS. Constraining the adjustment to the CORS optimally aligned the GNSS passive control with the active control, providing a unified reference frame to serve the nation's geometric positioning needs." https://www.ngs.noaa.gov/web/surveys/NA2011/ That is, unless I've completely misunderstood what I just read and that the change would have a cascading effect. Good luck! Michael Ray <https://www.linkedin.com/in/mikesray/> Town of Canton <http://www.town.canton.ma.us/> - GIS Analyst [log in to unmask] (339)502-5737 <(339)%20502-5737> X1140 [image: Inline image 1] On Wed, Oct 4, 2017 at 4:28 PM, Smith, Ben - NRCS, Tolland, CT < [log in to unmask]> wrote: > Hi All, > > Besides the name, does anyone know if there is supposed to be a difference > in ArcMap between the *NAD 1983 (2011) StatePlane Connecticut FIPS 0600 > (US Feet)* and *NAD 1983 StatePlane Connecticut FIPS 0600 (US Feet)* > projections? I tried testing it with and without transformations, and > there seems to be nothing different. > > Thanks, > > Benjamin Smith, Hydrologist > > USDA, Natural Resources Conservation Service > > 344 Merrow Road, Suite A > <https://maps.google.com/?q=344+Merrow+Road,+Suite+A%0D+Tolland,+CT+06084&entry=gmail&source=g> > > Tolland, CT 06084 > <https://maps.google.com/?q=344+Merrow+Road,+Suite+A%0D+Tolland,+CT+06084&entry=gmail&source=g> > > ' (860) 871-4027 > > * [log in to unmask] > > > > > > > > > This electronic message contains information generated by the USDA solely > for the intended recipients. Any unauthorized interception of this message > or the use or disclosure of the information it contains may violate the law > and subject the violator to civil or criminal penalties. If you believe you > have received this message in error, please notify the sender and delete > the email immediately. > ------------------------------------------------------------------------- > This list (CTGIS-L) is an unmoderated discussion list for all CT GIS Users. > > If you no longer wish to receive e-mail from this list, you can remove > yourself by going to http://listserv.uconn.edu/ctgis-l.html > ------------------------------------------------------------------------- This list (CTGIS-L) is an unmoderated discussion list for all CT GIS Users. If you no longer wish to receive e-mail from this list, you can remove yourself by going to http://listserv.uconn.edu/ctgis-l.html