Our land use data sets can be aggregated into combinations of administrative units of the user's choice. Currently, the finest resolution we provide is at the first level administrative unit (i.e., state, province, etc.). Our database, based on ESRI's Admin98 boundaries dataset of the world, contains 2605 first level administrative units.
The user begins with an initial choice of World Macro Regions as defined by the United Nations. These regions can then be further subdivided or aggregated sequentially over several steps to arrive at a final set of regions that the user desires.