1. ArcCatalog and Geodatabases
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ArcCatalog
ArcCatalog is one of the three components of the ArcGIS software. The other two are ArcMap and ArcToolbox.
ArcCatalog has advanced capabilities for accessing, managing and previewing data.
View Types
There are three different types of views for data display:
____________
__________
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Folder Connection
To access the data in a folder or geodatabase, a connection has to be established.
To establish the connection, click on the Connect to Folder button.
In the Connect to Folder wizard, navigate to the folder or geodatabase that contains the data and click OK.
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Preview
Geography Preview
Table Preview
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Metadata
The metadata view in ArcCatalog can be used for viewing ____________________.
Metadata can be _________, __________, __________or _______________ using the Metadata toolbar.
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Why Geodatabase?
What do you need to do with your GIS data?
some suitable habitat mapping of endangered species
Location of trade center
Watershed analysis and modeling
Etc..
There is a need to represent and store data in a way that supports
Meaningful and accurate analysis
Organizational workflows.
Geodatabase supports for all these
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Why Geodatabase?
Maintaining accurate data is a concern of all GIS users. The geodatabase offers you the ability to ____________ geographic features that represent the real world. As the real world changes, you must update these features and their attributes. When creating or updating data, you can add behavior to your features and other objects to minimize the potential for errors.
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Geodatabase
A geodatabase is a relational database that contains spatial and non-spatial objects.
Types of Geodatabases
1-Personal Geodatabases:
Have .mdb extension.
Can be viewed by ______________ but edited by only _________________
Have a maximum size of ____________.
Do not store raster data.
2-File geodatabase :
Many Number of users Single user and small workgroups
Storage format: File system folder that holds each dataset in a separate file (.gdb)
Size ___________ per dataset.
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Geodatabase
3-Multi-user Geodatabases:
Require ArcSDE and a DBMS ( Data Base Management Systems).
Can be read and edited by multiple users at the same time.
Can store raster data.
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10. Personal Geodatabases
Importable Data Types:
Coverages
Shapefiles
CAD drawings
INFO tables
DBF tables
Can be opened with ArcCatalog.
Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

11. Advantages of Geodatabase
It provide advantages for
Modeling
Analyzing
Managing
maintaining GIS data.
Using geodatabase GIS features can be created that support real world feature behavior
Data access from a centralized location possible
(ESRI, 2006)
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Geodatabase Elements
Workspace
Geodatabase
Feature Dataset
Feature Class
Geometric
Network
Relationship Class
Table
Raster Data
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A feature class
Is a collection of features geographic objects in tabular format that share the same geometry type (point, line, or polygon), such as Wells, Roads, and Parks.
It have the same behavior
and the same attributes.
All feature classes have a field
named “Shape.”
A feature class can be stored at the
geodatabase root or in a feature dataset.
A feature class can be standalone
A feature dataset :is a collection of feature classes.
All the feature classes in a
feature dataset:
1- Should have topological relationships Must have the same spatial reference.
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14. Feature Dataset Properties
The Feature Dataset Properties wizard can be used for viewing or defining a feature dataset’s spatial reference properties.
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Feature Class Types
Point
Annotation
Line
Polygon
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Tables
A table (or object class) is a collection of non-spatial objects in tabular format that have the same behavior and the same attributes. All object classes have a field called “ObjectID,” sometimes also called FID or OID.
Tables can be stored at the root level of geodatabases but not inside feature datasets.
Table format supported: INFO, dBase and others.
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Domains
Domains help enforce data integrity
Attribute Domain
Attribute domains define what ___________ are allowed in a field in a feature class or nonspatial attribute table.
There are two different types of domains
1-Range Domains A type of attribute domain that defines the ________________________ for a numeric attribute. For example, the permissible range of values for a pipe diameter could be between 1 and 32 inches.
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Domains
Attribute Domain
2- Coded value domains are explicit lists of acceptable values. They can be applied to an attribute of any field type for example, text, numeric, or date.
Coded value domains include both the code values and a more user-friendly description of what the codes represent.
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Domain Properties
Field Type: Text, short integer, long integer, double, date, etc.
Domain Type: Coded values, range
Split policy: Duplicate, default or geometric ratio
Merge policy: Default, sum, weighted average
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20. Subtype Subtypes are subsets of feature classes and tables.
Objects in a class can be differentiated based on attribute values attached to the features.
Example: A feature class that represents roads can have two types of roads - US Highway and Interstate. Each type forms a class subtype.
Creating subtypes can be more _____________ creating many feature classes
or tables in a geodatabase. For example,
a geodatabase with a dozen feature classes that have subtypes will
perform better than a geodatabase with a hundred feature classes.

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Coded value
Range Domains
Coded value
Range Domains
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Relationships
A Relationship is an association or link between two objects in a database.
1-A relationship can exist between spatial objects (features of feature classes), non-spatial objects (records of tables), or between spatial and non-spatial objects.
Relationship between non-spatial objects
State Name
and code
State Population
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Relationships
2-Relationship between spatial and non-spatial objects
Spatial data
Non-spatial data
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Relationships
3-Relationship between two spatial objects
Spatial data
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4-Relationship Class
A relationship class is an association between two object classes (i.e., feature classes or tables).
Relationships can be one-to-one, one-to-many or many-to-many.
Can be created and edited using ArcInfo or ArcEditor only, but can be accessed with ArcView.
Can be inside or outside feature datasets.
Relationship Class
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Organize the geodatabase
Step 1: Create the geodatabase and load data
Step 2: Create behaviors, such as domains, as needed
Step 3: Create behaviors, such as subtypes, as needed
Step 4: Test your model for functionality, workflow, and performance
Step 5: Revise your model and repeat the process, as needed
Dr. Abdelrahman Abueladas Digital Mapping Lecture 8