What should I be aware of before trying to reproject a SAD69 feature class to SIRGAS2000? What are the steps needed to accomplish this task?
I found this link that points to a program called ProGriD developed by IBGE (the brazilian institute of geography and statistic).
Instead of using a third-party software I would like to do it in ArcMap, because in ArcMap I can create a python script to run against all feature classes at once and store the reprojected data in a brand new database instead of modifying the old one.
*Note:I 'm not familiar with reprojections. I'm a developer, not a geographer.