Topographic mapping depicts natural and manmade features on the earth's surface such as transportation & access networks, hydrography, Alberta Township System, Geo-administrative Areas and contours.
The 1:20 000 Base Feature dataset is the most accurate and detailed of the Base products, and was created to populate GIS applications. The Access & Geo-Administrative layers are updated periodically.
1:20 000 Historic files are not updated, but provide a reliable base for cartographic mapping. Small scale products are more generalized and offer provincial Base mapping coverage.