1. A non-transitory computer readable medium having computer-executable program code stored thereon, such that when the program code is executed by a computing device, it causes the computing device to: access property data corresponding to a geospatial area; generate property data statistics from the accessed property data; receive a user selection of at least one comparison category and at least one aggregation level that defines divisions of the geospatial area for statistical aggregation; determine, from the property data statistics, selected property data statistics that correspond to the divisions defined by the selected aggregation level and to the selected comparison category; generate and display at least one thematic map image that illustrates the divisions defined by the selected aggregation level such that their respective appearances depend on the selected property data statistics corresponding thereto; while the at least one thematic map image is being displayed, receive a first user selection of a first division, which is one of the divisions that is displayed in the at least one thematic map image, and in response to receiving the first user selection, automatically: generate a graph image that graphs the selected property data statistics that correspond to the selected comparison category and to the first division across time; and display the graph image together with the at least one thematic map; while the graph image is being displayed together with the at least one thematic map image, receive a second user selection of a second division, which is another one of the divisions that are displayed in the at least one thematic map image, and in response to receiving the second user selection, automatically: update the graph image such that it distinguishably graphs the selected property data statistics that correspond to the second division across time in comparison to the selected property data statistics that correspond to the first division, the selected property data statistics that correspond to the second division having not been included in the graph image prior to the updating of the graph image; and display the updated graph image together with the at least one thematic map.