I have a map service where all the data is having GCS NAD 1927 as its coordinate system. I have published the map service with the same projection as the data source. I would like to know is ESRI applies any transformation since the base map coordinate system is in WGS 1984 Web Mercator. IF it is applying is it possible for us to know how and what transformation is being applied
My another question is DO I need to set the data frame coordinate system same as WGS 1984 Web Mercator or shoudl I leave as the same as the feature class coordinate system. If we apply on the fly projection to the data frame , will there be any performance lag ? And From Accuracy stand point what should be followed ?