GGR272H1 Lecture Notes - Lecture 9: Binary Large Object, Spatial Database, Arcgis
Document Summary
Gis involves spatial and attribute data: spatial data relate to the geometries of spatial features, attribute data describe the characteristics of the spatial features. For example: attribute data such as street names, address ranges and postal codes are associated with each street segment in the tiger/line files. Georelational data model stores spatial data and attribute data separately and links the two by the feature id: the two data sets are synchronized so that they can be queried, analyzed and displayed in unison. Object-based data model (e. g. geodatabase) combines both geometries and attributes in a single system. Raster data model is different; each cell value corresponds to a value of a continuous feature at the cell location: only an integer raster has a value attribute table that summarizes cell values and their frequencies. Attribute data store in tables and organized in rows and columns.
