A Map can have more properties such as 'elevation', 'name' (e.g. Level 1), and 'shortName' (e.g. L1). The elevation property can be used to determine the order of the floors (first, second, etc). Elevation is 0 based, going up and down in integers representing the number of floors above or below 0, which is ground level.
The Mappedin 'things' object is where you would specify what properties you want to download for Maps. Only specify what you will actually use, to minmimze transfer time. Work with your Mappedin developer relations contact to set up any custom properties you need.
See below for an example a 'things' object with available Map properties specified:
maps: ['name', 'elevation', 'shortName']
Map Group this map belongs to.
Polygons on this Map.
Create coordinate using lat/lon
latitude of coordinate
longitude of coordinate
Create coordinate using mappedin units
x of coordinate
y of coordinate
map rotation in radians from north