Chang Ch 4 - Object-Based Vector Data Model

Front 1

Object-based Vector data model

Back 1

stores spatial and attribute data in same system. Treats spatial data as objects.

Front 2

Property

Back 2

describes an attribute or characteristic of an object.

Front 3

Method

Back 3

performs a specific action.

Front 4

Association

Back 4

set of objects with similar attributes.

Front 5

Aggregation

Back 5

defines how many instances of one class can be associated with the other class through multiplicity expressions at both ends of the relationship. (i.e. address associated with one zip code but many apartments)

Front 6

Composition

Back 6

describes the whole-part relationship between classes. (i.e. census tract aggregate of number of census blocks)

Front 7

Type Inheritance

Back 7

in a composition relationship solely owns the part. (i.e. highway controls lifetime of roadside rest area.)

Front 8

Instantation

Back 8

defines relationship between superclass and subclass, but subclass can have additional properties (i.e. residential area is member of built-up area but has unique properties such as lot size)

Front 9

Feature Class

Back 9

object of a class can be created from an object of another class. (i.e. high density residential area object can be created from a residential area object).

Front 10

Feature Dataset

Back 10

stores spatial data of the same geometry type

Front 11

Interface

Back 11

represents a set of externally visible operations of an object. These objects can have properties and methods that are hidden in the object.

Front 12

Encapsulation

Back 12

refers to the mechanism that is used to hide the properties and methods of an object so that the object can only be accessed through the predefined interfaces.

Front 13

Inheritance

Back 13

Means that an object inherits properties and methods from the class to which the object belongs.

Front 14

Polymorphism

Back 14

means that the same method can produce different effects, depending on the kind of object to which the method is being applied.

Front 15

ArcGIS Four general validation rules for grouping of objects:

Back 15

Attribute Domains, Relationship Rules, Connectivity Rules, Custom Rules

Hint 15

*NOT AVAILABLE IN COVERAGE MODEL, ONLY GEODATABASE

Front 16

Attribute Domains

Back 16

group objects into subtypes by a valid range of values or a valid set of values for an attribute.

Front 17

Relationship Rules

Back 17

rules such as topology rules connect objects that are associated.

Front 18

Connectivity Rules

Back 18

let users build geometric networks such as streams, roads, and water and electric utilities.

Front 19

Custom Rules

Back 19

allow users to create custom features for advanced applications.