The Impervious Surface - 1995 layer contains polygon features generated from the 1995 through 1998 Digital Aerial Survey mapping line work. The use of multiple years of DAS updates best reflects the impervious layer as it was in 1995.The Impervious Surface layer features represent the various impervious surface types found within The City of Calgary. These features are classified by surface type and description based on the classifications and specifications used in the Digital Aerial Survey Program. Additional higher level general surface type classification and referencing to the Alberta Township System (ATS) has been applied to each impervious surface layer feature. To learn more about other DAS products available, visit Digital Aerial Survey.

The Impervious Surface - 2010 layer contains polygon features generated from the 2010 Digital Aerial Survey mapping line work. The Impervious Surface layer features represent the various impervious surface types found within The City of Calgary. These features are classified by surface type and description based on the classification and specifications used in the Digital Aerial Survey Program. Additional higher level general surface type classification and referencing to the Alberta Township System (ATS) has been applied to each impervious surface layer feature. To learn more about other DAS products available, visit Digital Aerial Survey.

Every year in May, The City conducts the Central Business District (CBD) cordon count. The cordon count is performed at 31 locations around the CBD over a four week time period, collecting data on how people travel into and out of downtown Calgary. The CBD cordon circles the downtown with the Bow River to the north and the railway tracks to the south and from 11 Street in the west to the Elbow River in the east. These data represent the total number of persons entering (inbound) and exiting (outbound) at each location, by modes, during a 16 hour time period. This raw dataset is NOT normalized to average weekday. It is a snapshot of the inbound and outbound activity on a single day at these locations and reflects conditions specific to that day such as construction, lane closures, weather, etc. Therefore, data may not be directly comparable between locations or years.

The Development Permit Public Notices data set consists of development permits which have been made public. The City of Calgary is required by law to publish Development Permit information for two weeks.