See this example properly formatted in the QUT Cite tool.
Standard in-text citation examples are in Getting started - In-text citation.
Author A. Title [format]. Place of publication: Publisher; Year [cited Year Month Day]. Available from: https://www.xxxx.xxx.xx
Brisbane City Council. [Historical Floods William Street, Brisbane City, 1974] [Internet]. Brisbane (QLD): Brisbane City Council; 2017 [updated 2017 May 5; cited 2018 Jan 13]. Available from: http://floodinformation.brisbane.qld.gov.au/fio/
If a map does not have a formal title construct a title using the name of the area covered by the map and place in square brackets.