Transcript ArcCatolog and Geodatabases

ArcCatalog and
Geodatabases
Francisco Olivera, Ph.D., P.E.
Srikanth Koka
Department of Civil Engineering
Texas A&M University
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:
Contents
Preview
Metadata
Main menu
Standard
toolbar
Catalog
Tree
View Type
Display
Preview
Type
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.
Preview
Geography Preview
Table Preview
Metadata
The metadata view in ArcCatalog can be used for viewing information
about the data.
Metadata can be created, edited, imported or exported using the
Metadata toolbar.
Geodatabase
A geodatabase is a relational database that contains spatial
and non-spatial objects.
Types of Geodatabases
Personal Geodatabases:
Have .mdb extension.
Can be viewed by multiple users but edited by only one user at a
time.
Have a maximum size of 2 Gigabytes.
Do not store raster data.
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.
Personal Geodatabases
Importable Data Types:
Coverages
Shapefiles
CAD drawings
INFO tables
DBF tables
Can be opened with ArcCatalog and MSAccess.
Geodatabase Elements
Workspace
Geodatabase
Feature Dataset
Feature Class
Geometric
Network
Relationship Class
Table
A feature class is a collection
of geographic objects in
tabular format that 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.
New feature classes can be
created using ArcCatalog. To
do this, right click on a
geodatabase or feature
dataset, and point to
New/Feature Class.
Feature Class
Feature Class Types
Annotation
Line
Point
Polygon
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.
Attribute Domain
Attribute domains are used
to constrain the values
allowed in any particular
attribute of a table or
feature class.
There are two different
types of domains
Range Domains
• Define a range of
acceptable values for an
attribute
Coded Value Domains
• Define a set of acceptable
values for an attribute
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
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.
Feature Dataset
A Feature Dataset is a
collection of feature classes
that have the same spatial
reference.
Feature datasets can also
store relationship classes and
geometric networks, but not
tables.
New feature datasets can be
created using ArcCatalog. To
do this, right click on a
geodatabase, then point to
New/Feature Dataset.
Feature Dataset Properties
The Feature Dataset
Properties wizard can be
used for viewing or
defining a feature
dataset’s spatial
reference properties.
Relationships
A Relationship is an association or link between two objects in
a database.
A relationship can exist between spatial objects (features of
feature classes), non-spatial objects (records of tables), or
between spatial and non-spatial objects.
Relationships
Relationship between non-spatial objects
State Name
and code
State
Population
Relationships
Relationship between spatial and non-spatial objects
Spatial data
Non-spatial data
Relationships
Relationship between two spatial objects
Spatial data
Spatial data
Relationship Class
A relationship class is an association
between two object classes (i.e.,
feature classes or tables).
Relationships can be one-to-one, oneto-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
References
Mac Donald, “Building a Geodatabase”, Environmental
Systems Research Institute (ESRI), Redlands, Calif
http://www.ce.utexas.edu/prof/maidment/giswr2003/visual/
lecture22003.ppt
http://mark.gisc.kennesaw.edu/4405/Geodatabase.pdf
http://visc.sis.pitt.edu/resources/tutorials/GIS/Geodatabas
es.pdf
http://www.gis.state.ar.us/Downloads/GIS/presentations/Ge
odatabase%20101.pdf