geographic information systems
type: Concept
narrower: overlay

concepts
type: Collection
type: ConceptGroup
member: overlay

overlay
definition: Overlay is, for most people, one of the most definitive operations of geographic information systems (GIS). Overlay makes it possible to combine vector and/or raster data for any areas based on a common coordinate system. [Source: Encyclopedia of Human Geography; Overlay]
broader: geographic information systems
type: Concept