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The Attribute Table! . Without the attribute table, a polygon is just a polygon, a point is a point The attribute table defines what points, lines, or polygons (features) are and describes their characteristics. . Is it a city or a tree? . The Attribute Table! . Area. 2745.767. - PowerPoint PPT Presentation
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Without the attribute table, a polygon is just a polygon, a point is a point
The attribute table defines what points, lines, or polygons (features) are and describes their characteristics.
The Attribute Table!
Is it a city or a tree?
The Attribute Table!
The Attribute Table!
You can add/associate data to your attribute table by:
creating a new field joining (one-to-one)joining (one-to-one) relating (one-to-many
records)
Area
796.5096 2745.767 1840.4960
You can add/associate data to your attribute table by:
creating a new field joining (one-to-one) relating (one-to-many relating (one-to-many
records)records)
The Attribute Table!
Schools
Relational Database Model
Types of relationships Cardinality - one-to-one, one-to-many,
many-to-many
Examples…? state capitol to statestate to citiescities to state
Keys fields are used to create relationships between tables.
Can be a number or a text field.
Always create a relationship from the spatial table (shapefile, geodatabse) to the non-spatial table
Most Common!
Joins and Relates
One-to-One relationshipis created using the JOIN operation
external table is appended to your shapefile/geodatabase attribute table
One-to-Many relationshipis created using the RELATE operation
external table is physically separate from the attribute table
Two ways of linking an external table to a shapefile or geodatabase
Joins
Non-Spatial Layer table (dbf, csv, txt)
Spatial Layer shapefile, geodatabase
A join appends the fields from thenon-spatial table to the spatial table.
You can symbolize and query table information that is contained in the non-spatial table
Ave00
Joins
Spatial Layer shapefile, geodatabase
Non-Spatial Layer table
NAME
Relates
Spatial Table Non - Spatial Table
Cannot symbolize Cannot use “select by attribute” across tables
A relate does not append the fields from the non-spatial to spatial table (tables separate)
Relates
Spatial Layer shapefile, geodatabase
Non-Spatial Layer table
Joining and Relating Tables
1 to 1 Join 1 to Many Relate Many to 1 Join Many to Many Relate
Allows link from the spatial table to the external table!(right-click on the shapefile/geodatabes to begin the join or relate)
Manipulation of Fields and Attribute Data – Adding and Deleting Fields
Add Fields from the Options button in the attribute table
Delete Fields by right-clicking on the field
Manipulation of Fields and Attribute Data – Adding Fields
Add Fields from the Options button in the attribute table
Manipulation of Fields and Attribute Data – Field Calculator
-Saves time in data entry - automatically calculate values for a field-copying-concatenating-creating new values using mathematical operations (add field 1 to field 2)
-Advanced Field Calculatorperforms advanced calculations using Visual Basic for Applications (VBA) statements
Right-click on field heading
Field Calculator
Manipulation of Fields and Attribute Data - Summarize
Summarizing allows you to aggregate your records by a field
•sum •average•count•minimum•maximum value•standard deviation•variance
ArcMap creates a new table containing the summarized data
Useful for joining tables
Manipulation of Fields and Attribute Data - Summarize
Right-click fieldSummarized DialogCreate a new table