I have a python script that creates an event layer from a csv file and then projects the event layer to a feature class. When the user runs the tool they are asked for the input csv file, input and output coordinate system (set as a spatial reference data type parameters). However I would then like to have them select the geographic transformation to use, from a list generated from the input\output coord systems, like the standard project tool does. Is this possible?
Thanks in advance.
You should be able to add this to a script tool. Xander Bakker has a blog post Implementing cascading drop down lists in a toolbox using validation with Python in which he uses a dictionary for a similar purpose. You might look in the documentation Programming a ToolValidator class for additional info.