1. Physical Structure of GDB
Geodatabase
Feature datasets
Spatial Reference
Object classes, subtypes
Features classes, subtypes
Raster datasets
Rasters
Relationship classes
Geometric networks
TIN datasets
nodes, edges, faces
Planar topologies
Locators
Attribute Domains
Addresses, X.Y location
ZIP Codes, Place names
Validation rules
Introduction to Geodatabases

2. Subtypes and Attribute domain
Problem Scenario (2)
Subtypes (6)
Integrity with Attribute Domain (3)
Domain Types (3)
Split and Merge Policy (5)
Attribute Validation
Creating Domains (6)
Summary, Review Questions and Next…
Geography,
KHU,
Jinmu Choi
Introduction to Geodatabases

3. Introduction to Geodatabases
Scenario
Scenario
Assuming a feature class called WaterMains may store pressurized water mains
It may be true in a water network that only transmission water mains can have a pressure between 60 and 100 psi, while distribution water mains can have a pressure between 40 and 65 psi
Now you have to implement this validation rule: How?
Introduction to Geodatabases

4. Introduction to Geodatabases
Solving scenario
Use lightweight classification: subtypes
You don’t have to create separate feature classes for transmission and distribution water mains
You want to distinguish these types of water mains from each other to establish separate set of domains and default values with subtypes
Introduction to Geodatabases

5. Introduction to Geodatabases
When to use Subtypes
Use subtypes
When trying to distinguish objects by their default value, attribute domains, various rules
Use additional classes
When trying to distinguish objects based on different behaviors, attributes, access privileges, or multi-versioned
Introduction to Geodatabases

6. Introduction to Geodatabases
Subtypes
Feature classes or objects contain subtypes
A feature’s subtype is determined by its subtype code value
The subtype code is stored in an integer field in the feature class or table
Each subtype can have own set of default values and attribute domains for a given field
Introduction to Geodatabases

7. Introduction to Geodatabases
Creating Subtypes
Add a Field for subtype using Integer
Use subtype tab on the feature property
Introduction to Geodatabases

8. Creating Subtypes (cont.)
Introduction to Geodatabases

9. Creating Subtypes (cont.)
Introduction to Geodatabases

10. Introduction to Geodatabases
Deleting Subtypes
Use Subtype tab in the feature property
Select subtype in the list and click Delete key
You cannot delete a subtype if it is currently referenced by a topology rule: close ArcMap
Introduction to Geodatabases

11. Introduction to Geodatabases
Enforcing Integrity
Maintaining accurate data is a concern of all GIS users
Attribute domains in a geodatabase specify valid values for an attribute
When attributes are being edited, attribute domains help prevent data errors in one of two ways:
Create a list of valid attribute values from which users must choose
With valid range of data, give users the ability to check that all features are valid after editing
Introduction to Geodatabases

12. Introduction to Geodatabases
Attribute domain
Attribute domains are rules that describe the permissible values of a field type
Attribute domains are used to constrain the values allowed in any particular attribute for a table, feature class, or subtype
Multiple feature classes and tables can share attribute domains in the database
Attribute domains are stored in a geodatabase, Not feature dataset and classes
Introduction to Geodatabases

13. Check Integrity with Domain
Use Domain
Class Property
Create Domain
Validate Features
Geodatabase Property
Introduction to Geodatabases
ArcMap: Editor/validation

14. Domain Types - Range domain
Two different types of attribute domains
Range domain specifies a valid range of values for a numeric attribute
Validation in ArcMap: After editing, run Editor/Validation to validate features that have a range domain
After running Validate Features, the features with errors remain selected
Introduction to Geodatabases

15. Domain Types – Coded value domain
Coded value domain are explicit lists of acceptable values and can apply to any type of attribute
Attribute domains don’t have a property that allows or disallows null values in an associated field: treat null as valid value
Introduction to Geodatabases

16. Domain Types – Coded value domain
Validation is automatic for coded value domains
When you're editing an attribute of a feature class that references a coded value domain, you cannot manually enter an attribute value of the feature class
Instead, choose the desired value from a dropdown list that contains the valid values
Introduction to Geodatabases

17. Validation with Policies
Introduction to Geodatabases

18. Splitting Behavior in AD
Type of Split policy
Duplicate — both features inherit the same attribute value as the original feature
Default value — both features are assigned the default attribute value if one has been specified in the field properties (or subtype) [If no default value has been specified, both features inherit the same value as the original feature]
Geometry ratio — each feature
is assigned a new attribute
value based on a ratio of
the original feature's attribute
value
Introduction to Geodatabases

19. Introduction to Geodatabases
Examples of Splitting
Introduction to Geodatabases

20. Introduction to Geodatabases
Merging Behavior in AD
Type of Merge policy
Default value — the new feature is assigned the default attribute value if one has been specified
[If no default value has been specified, the feature will inherit the value of one of the originals]
Sum — the new feature is assigned an attribute value that is the sum of the values of the original features
Weighted average — the new feature is assigned an
attribute value that is the
weighted average, based on
geometry, of the values of
the original features
Introduction to Geodatabases

21. Introduction to Geodatabases
Examples of Merging
Introduction to Geodatabases

22. Setting Attribute Domain
Introduction to Geodatabases

23. Browsing Attribute Domain
Use Domain tab on the GDB property
Use Domain button on the Subtype tab of the feature class property
Introduction to Geodatabases

24. Introduction to Geodatabases
Creating Range Domain
Use Domain tab on the GDB property
Introduction to Geodatabases

25. Introduction to Geodatabases
Creating Coded Domain
Use Domain tab on the GDB property
Introduction to Geodatabases

26. Deleting Attribute Domain
User Domain tab in the GDB property
Select domain and click Delete key
While a domain is being used by a table or feature class, it cannot be deleted or modified: close ArcMap
Introduction to Geodatabases

27. Introduction to Geodatabases
Use Domain in a Table
If a domain is associated with a feature class or table, an attribute validation rule is created in the GDB
Introduction to Geodatabases

28. Introduction to Geodatabases
Summary
Subtypes
Integrity with Attribute Domain
Domain Types
Attribute Validation: Split and Merge Policy
Creating Domains
Introduction to Geodatabases

29. Introduction to Geodatabases
Next…
Lab: Working with Domains and Subtypes
Next: Field Study
Exam Guide
Next: Relationships
Reading
Read Building GDB (handout)
Ch 6
Introduction to Geodatabases