Data abstraction model in GIS
The Earth’s surface is extremely complex. It is shaped by a dynamic interplay of physical, biological, and human processes operating over space and time . Geographic Information System is used to map and analyze the complexities on the surface of the Earth. Because of the complexities it is very difficult to represent the real-world features in a Geographical Information System. The Data Abstraction Model (DAM) refers to the conceptual framework that simplifies complex real-world geographic phenomena into manageable digital structures. It helps users understand how spatial data is organized, stored, accessed, and represented inside a GIS. Levels of Abstraction in GIS GIS data abstraction generally operates in three hierarchical levels : Conceptual Data Model (What) Defines what exists in the real world without implementation details Includes geographic entities such as rivers, roads, land parcels, mountains, etc. Uses semantic relationships (e....