Title: Topographic Map Maker Date: Varies depending on data set. Geography: Ontario Publisher: Ontario Ministry of Natural Resources Availability: Freely available for all to download from the web. More info. Title: Toronto and Surrounding Area Base Data Classes (OMNR Aurora District) Date: Varies depending on data set. Geography: GTA and Surrounding Area, Aurora District Publisher: Ontario Ministry of Natural Resources Availability: Available for direct download by Ryerson community members. More info.