I am sorry in advance for my may be naive question. I have been exploring ArcGIS 10 mainly for some built in functionality. However, I am focusing on a research based on cellular automata modeling of settlements. I am looking for a guiding reply how to start the process with ArcGIS 10. I have historical vector maps for calibration, some are yet to be digitized. Can anyone suggest whether I should rasterize for CA? Please.