Multi-layer digital elevation model

A multi-layer digital elevation model (DEM) structure is disclosed. A device may access a first structure that comprises a plurality of first elevation values and a plurality of location identifiers that may correspond to a geographic region. The first elevation values may be associated with a first layer in the geographic region and correspond to respective location identifiers. The device may access a second structure that identifies a second layer in the geographic region. Second elevation values that may correspond to at least some of the plurality of location identifiers may be determined. A multi-layer DEM structure may be generated that stores the first elevation values and the second elevation values in association with corresponding location identifiers.