ArcCatalog and Geodatabases Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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: ____________ __________ Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Preview Geography Preview Table Preview Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Metadata The metadata view in ArcCatalog can be used for viewing ____________________. Metadata can be _________, __________, __________or _______________ using the Metadata toolbar. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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 Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

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

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) Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Geodatabase Elements Workspace Geodatabase Feature Dataset Feature Class Geometric Network Relationship Class Table Raster Data Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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 2-Must have the same spatial reference. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Feature Dataset Properties The Feature Dataset Properties wizard can be used for viewing or defining a feature dataset’s spatial reference properties. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Feature Class Types Point Annotation Line Polygon Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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. Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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 Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

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.

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Coded value Range Domains Coded value Range Domains Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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 Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Relationships 2-Relationship between spatial and non-spatial objects Spatial data Non-spatial data Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 Relationships 3-Relationship between two spatial objects Spatial data Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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 Dr. Abdelrahman Abueladas Digital Mapping Lecture 8

Dr. Abdelrahman Abueladas Digital Mapping Lecture 8 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