Everything we have done up until this point has been in the absence of the Geomorphic Change Detection Software (GCD 5.0). You do not need the GCD Software to do meaningful change detection analyses. The principles and methods are straight forward to apply in a GIS environment, or to code up independently. However, the GCD Software exists to facilitate these tasks and analysis by making them easier to undertake and promoting more consistency in the processing. Here we will talk briefly about the history of GCD software development, explain what the software does, show you around in the software, and then go through the same exercises we did in topic E, but with the GCD software.