Resumen
Geographic information systems (GIS) are used to collect, analyze, the present information describing the physical and logical properties of the geographic world. Geographically referenced data is the spatial data that pertain to a location on the surface of earth. There are four functional units in a typical GIS: Data Input Unit, Data Model, Data Manipulation Capabilities, Result Presentation Facilities. This article proposes a new model called the Geographic Information System Entity Relational model (GISER). This model explicitly represents the discretization aspects so as to unify the two approaches. GISER extends the Enhanced Entity Relationship (EER) model to include continuous fields. The continuous fields are associated with the discretizations and interpolation models. GISER also uses procedure-valued attributes within the EER model. GISER implementation using current relational and object databases raises the issues of implementation of continuous fields. Future works work includes the evaluation of the GISER model in different GIS application domains.