Authoritative data sources are identified through open source research. That data is then acquired and transformed into a usable data format. The properly formatted data then goes through preprocessing steps that includes a geocoding operation to give spatial context to the data. The data goes through further refinement using remote sensing techniques. After preprocessing, every record goes through a review process and each polygon is determined by the outer most fence or the obvious footprint of the building based on interpretation of the best available imagery and open source information. Polygons were used to represent the idea of population containment. The polygon attempts to outline the area where the incarnated population is most likely to be at any given period of time. The VAL_DATE field indicates the date in which the review step took place.