2004 Digital Polling Division Boundaries: Changes

Digital polling division boundaries for 2004 were compared to polling division boundaries for 2006 and 2008 for select federal electoral districts. Polling divisions were identified by change type: larger than the comparison year, smaller than the comparison year, no change, and new division. Original polling division data was downloaded in December of 2009 from: http://geogratis.cgdi.gc.ca/geogratis/en/option/select.do?id=1169 NOTES: Be aware that polygons marked as no change that show boundary changes between the two comparison years can be 1) subdivided in one year and not the other, or 2) have an area difference of less than 1000 square meters. Polling divisions were identified based on the federal electoral district and polling division numbers, but not on any further division. A change threshold of 1000 square meters was used based on a previous analysis by Global Forest watch. Boundary changes that result in an area change of less than 1000 square meters will register as no change. Polygons identified as present in one year and not the other should be visually checked. Some are the same (or similar) shape with different polling division numbers, and some are truly new polling divisions present in one shapefile and not present in the other.