How does learning affect the structure of domain knowledge? This question is difficult to address in domains such as geoscience, where spatial knowledge is paramount. We explore a new platform, called CogSketch, for collecting and analyzing participants sketches as a means of discerning their spatial knowledge. Participants with differing levels of experience in the geosciences produced sketches of geologic structures and processes on a tablet computer running CogSketch software. This allowed for the analysis of not only the spatial-relational structure of the sketches, but also the process through which the sketches were constructed.