Data Models for Composite Features: TIN, Regions and Routes (Especially for GATE-Geospatial 2022)

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Composite Features

Composite features refer to those spatial features that are better represented composites of points, lines, and polygons. ESRI՚s coverage model, for example, includes such composite features as TINs (Triangulated Irregular Networks) , regions, and routes. The inputs to a TIN include point, line, and area features. There are three types of data models for composite features:

This Diagram Shows Data Model for Composite Features

TIN

Triangular irregular network data model approximates the terrain with a set of non-overlapping triangles.

Regions

Regions is defined here as a geographic area with similar characteristics. A coverage feature class that can represent a single area feature as more than one polygon.

Routes

A route is a line feature such as highway, a bike path, or a stream but unlike other linear features, a route has a measurement system that allows linear measures to be used on a projected coordinate system.

Composite feature classes allow several attribute tables to be associated with sections, routes, or regions. For this reason the individual attribute tables for composite classes are referred to as subclass tables.

The way a user organizes coverage is to have one composite feature subclass for each homogeneous set of attributes. In other words, a set of regions with common attributes is assigned to the same region subclass.

Figure Shows a Schematic of How Regions Are Related to Attri …

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