I've been working in GIS for about a year and have a functional grasp of Projections and Transformations from within ArcGIS (10.0). Geosoft Oasis is another program we use. In working with our data we primarily use NAD83 Zone 13 and 14 North. Although WGS84, NAD27, and NAD83(CSRS) often join the mix. With each of these different Coordinate Systems, there are many transformation options to go from one to the other.
I would really like to have a better understanding of how much of an error is created in each transformation. To do that, could someone tell me the best way to test this out?
As an example, we often have data that spans Zones. What happens when we using Zone 13 projection in our arc project in an area that should be Zone 14, but we don't want to break the data up? How much of a penalty is there if I work in WGS84 and then transform the data into a NAD83 projection (or a NAD27 one)? Are the errors cumulative? If I switch back and forth 50 times will my data move? Or if I switch between 3 Projections using 3 Transformations?
I'm not sure of a good method for finding an answer to these questions. I would like to be able to work through it myself instead of taking someone's word for it, but that might be a more technical task than I'm able to do...
Any help is appreciated, thanks,