This map of the area to the south of Xochimilco (southern Basin of Mexico) is a part of the Codex Cardona, whose current location is unknown. The authorship and timing of production of the Cardona manuscripts are still under investigation, but the naming of the Mendoza Moctezuma family and a reference to a spurious Royal Decree of April 14, 1523 in the codex provide a potential association with a late-colonial cacique group that made all kinds of contrived documents.
What is potentially valuable about this map, and other manuscripts and maps that comprise the Codex, is that it appears to have been based on some degree of investigation in other sources or firsthand knowledge that might now be otherwise inaccessible.
(Brief description by Stephanie Wood.)