Much of the information that we use is geospatially referenced. The need for homogeneous representation of global geographic themes is recognised as critical for sustainable development goals. The richness of local geographic data created and maintained by individual countries vary widely, creating what is known as a geospatial digital divide. Attempts to bridge this divide include the adoption of Discrete Global Grid Systems that provide an abstract and uniform method of partitioning space on Earth. This paper considers how the local methods of partitioning space adopted in individual countries and provided as open data can be integrated with this global grid system. The paper proposes a novel ontology design pattern for representing the integration of both grid systems, and evaluates it against existing methods. It is shown how a uniform treatment of spatial semantics is used to represent geographic places across grid systems. This proposal is a step towards the effective utilisation of these grid systems in building global geographic information systems.