In 2012 we studied the metadata of the DANS EASY archive to get insights in the internal structure of the collection and to explore the possibilities to further enhance the search process. Above you see one of the experiments. Click on the picture to see the interactive version. All the results of the project can be found here
This specific visualization displays the category hierarchy of EASY graphically in a tree (dendogram). In addition, it displays the datasets that were assigned to more than one category in a treemap, grouped by the number of datasets they were assigned to. If you move your mouse over a dataset, the visualization shows the corresponding categories in the category tree. If you click on a dataset your browser will open this dataset in DANS EASY in a new tab (using its persistent identifier).