Lecture Contents:

• Raster Data Model
  
• Vector Data Model
  
• Attribute Data Model
  

Raster Data Model

A format for storing, processing, and displaying ,graphic data in which graphic images are stored as values for uniform grid cells or pixels is called raster data model Raster data models incorporate the use of a grid-cell data structure where the geographic area is divided into cells identified by row and column. This data structure is commonly called Raster.

Vector Data Model

All spatial data models are approaches for storing the spatial location of geographic features in a database. Vector storage implies the use of vectors (directional lines) to represent a geographic feature.

Attribute Data Model

A separate data model is used to store and maintain attribute data for GIS software. These data models may exist internally within the GIS software, or may be reflected in external commercial Database Management Software (DBMS). A variety of different data models exist for the storage and management of attribute data.