GIS Data Models and Spatial Data Structures Lecture 2 Objectives

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In GIS, what does the object-based model represent?

Discrete features with identifiable boundaries and attributes

What is the purpose of GIS data models?

To represent real-world features in various forms like points, lines, arcs, and polygons

What are the two basic models in which geospatial data is depicted?

Object-based model and field-based model

What is a characteristic of spatial objects in GIS?

They have well-defined or identifiable boundaries

What is the main function of a data model in a database?

To provide a conceptual representation of data structures

How do GIS data models represent real-world features?

As points, lines, arcs, and polygons

What is the main difference between raster and vector GIS data models?

Raster data models represent data using a grid of cells, while vector data models represent data using points, lines, and polygons.

What is the significance of topology in GIS data structures?

Topology defines the spatial relationships between GIS features.

What is a distinguishing characteristic of the object-based model in GIS?

Spatial objects in the object-based model have identifiable boundaries and attributes.

Why do GIS data models represent real-world features as points, lines, arcs, and polygons?

To ensure a more accurate representation of the real-world features.

What is the purpose of a database management system (DBMS) in GIS?

To store and manage spatial and attribute data efficiently.

In what way does the field-based model differ from the object-based model in GIS?

The field-based model represents continuous surfaces, while the object-based model represents discrete features.

Learn about raster and vector GIS data models, advantages and disadvantages of each, topology, topological and non-topological data structures, and database management system in GIS.

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