Format: 

[1]F. Lastname, "Title of map," in Title of Compilation. City, State, Country: Publisher, Month Day Year. [Map]. Available: URL or Database Name

[2]F. Lastname, "Title of map," in Title of Compilation. City, State, Country: Publisher, Month Day Year. [Map].

In-text: In-text citations are treated as if they were footnotes and are enclosed in square brackets [1].

Examples: 

[1]"Poverty Rate by Census Tract: Hurricane Katrina Disaster Areas Louisiana, Mississippi, and Alabama Region." Washington, DC, USA: U.S. Census Bureau, Sep. 2005. [Map]. Available: https://www2.census.gov/geo/maps/special/HurKat_Orig/Katrina_Poverty_Rat...

[2]"Rochester, NY," in Google Maps. Mountain View, CA, USA: Google, Accessed on: Dec. 12, 2017. [Map]. Available: https://goo.gl/maps/hQNyouiux6A2

Notes: 

Consider including an access date for online materials, especially if you do not know the date of publication; when the access date is used in place of the date of publication, place it immediately after the publisher preceded by a comma as in the second example (see p. 39, "Books, Monographs: Examples," 4). The title of the map should appear in sentence case (i.e. only capitalize the first word and any proper nouns), while the title of the website or compilation should appear in title case (i.e. capitalize each word) (see p. 39, "Periodicals: Basic Format," 1). If you are citing a webpage compiled by a corporation or organization and it's appropriate, include the location for the publisher along with their name; otherwise, omit this information and place a comma between the title of the website and the date. Use [Map] or another appropriate descriptive label to indicate that you are not citing a traditional text-based source.

Questions? Contact an RIT Librarian at libraryhelp@rit.edu

Source:
IEEE - Adapted from: Books, Monographs (p. 38-39); Reports (p. 35-36); Reports and Handbooks (p. 39-40)