Vector Data Model: Preparation and Types (Georelational or Object-Based) (Especially for GATE-Geospatial 2022)

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Vector Data Preparation

The vector data model prepares data in two basic steps:

  • It uses points and their x-, y-coordinates to represent spatial features as points, lines, and areas.
  • It organizes geometry objects and their spatial relationships into digital data files that the computer can access, interpret, and process.
Vector Data Models

Vector Data Model

The vector data model has undergone more changes over the past two decades than any other aspect of GIS.

This Diagram Shows Types of Vector Data Model

The vector data model may be georelational or object based, may or may not involve topology, and may include simple or composite features.

Georelational Data Model

The georelational data model uses a split system to store spatial data and attribute data.

Object-Based Data Model

The object-based data model, on the other hand, stores spatial data and attribute data in a single system.

Recent trends suggest that GIS vendors have adopted the object based data model in their software development.

ESRI, Inc. has introduced a new vector data model with each new software package:

  • Coverage with Arc/Info,
  • Shape-file with Arc View, and
  • Geodatabase with ArcGIS

The coverage and shape file are examples of the georelational data model, whereas the geodatabase is an example of the object-based data model.

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