Feature request #8559
Doing calculations with CRS projections set "On The Fly"
|Pull Request or Patch supplied:||No||Resolution:|
If you have data in a certain projection--say long-lat WGS84--and you want to do a calculation that can only be done in a different projection--e.g. geometry, like area--you should be able to re-project all your data "on the fly" (including to a custom or user-defined CRS) and then do the calculation, using the coordinates of your data that come from the "on the fly" projection. Shouldn't have to save the re-projected data in the new projection and then open it in it's own projection first before doing the calculations (as seems to be the case now).
This is a basic functionality in ArcMap.