Unit Two: Attribute Tables In this unit… ► Features & properties Basic features Rearranging...

Unit Two: Attribute TablesUnit Two: Attribute TablesIn this unit…In this unit…

Features & Features & propertiesproperties

Basic featuresBasic featuresRearranging columnsRearranging columns

Freezing & Sorting columnsFreezing & Sorting columnsField Labels & Hiding fieldsField Labels & Hiding fields

Editing TablesEditing TablesEntering Edit Mode (!?)Entering Edit Mode (!?)

Changing Attribute valuesChanging Attribute values

►ReviewReview

►Opening Opening TablesTables

►Arranging Arranging and Moving and Moving WindowsWindows

2Unit Two – Attribute TablesUnit Two – Attribute Tables

Review – GIS Data TypesReview – GIS Data Types

►““Feature DataFeature Data”” Data Structures:Data Structures:

►““ShapefilesShapefiles””►““CoveragesCoverages””►““GeodatabasesGeodatabases” ”

Examples:Examples:►LakesLakes►HousesHouses►RoadsRoads

►““Image DataImage Data”” Data Structures:Data Structures:

►image image e.g. “e.g. “Digital Raster Digital Raster GraphicGraphic” (DRG” (DRG))

►““GRIDGRID””►““Digital Elevation Digital Elevation

ModelModel” (DEM)” (DEM)

Examples:Examples:►Aerial photoAerial photo►Image of USGS topo Image of USGS topo


ReviewReview

Each “Each “RecordRecord” in the ” in the table…table…

……Connected to a “Connected to a “FeatureFeature” ” in the “in the “Feature DataFeature Data””

THIS is the heartTHIS is the heartof GIS!of GIS!

THIS is the heartTHIS is the heartof GIS!of GIS!


ReviewReview

Attribute Tables – Just Columns & Rows.Attribute Tables – Just Columns & Rows.

When tables contain the attributes of geospatial features, When tables contain the attributes of geospatial features, the power of the data in the table is expanded… every the power of the data in the table is expanded… every

value can be represented graphically on a map!value can be represented graphically on a map!


ReviewReview

We want We want “Attributes” of a “Attributes” of a “Layer”, so…“Layer”, so…

Opening an Opening an Attribute Attribute

TableTable

Context is LayerContext is Layer

……right click and select right click and select ““Open Attribute Table”Open Attribute Table”


Arranging and Moving Arranging and Moving WindowsWindows

Here’s the issue: windows that you open land on top and stay on top.The Window menu is unlike those you would find in most other Windows programs: ► no tiling, ► no cascading, ► no switching

between windows.

Big change for AV Big change for AV 3.x users!3.x users!

Learn to cope.Learn to cope.


Arranging and Moving Arranging and Moving WindowsWindows

You can always You can always minimize minimize windows… windows… They go to the They go to the bottom of the bottom of the screen.screen.

► Better: re-arrange the windows altogether

But look… bothwindows are

“Active”

►You can take action in both windows

……andand► re-size them by dragging re-size them by dragging

the corners or borders.the corners or borders.

► Just drag them using Just drag them using the title bar…the title bar…


Table Features and Table Features and PropertiesProperties

► Some window features: Current record Record advance Show All / Show

Selected toggle Selected record

counter Options button

Make Column Active Active

Select a Row

► Click HERE to…

► and HERE to…Table Table Option Option MenuMenu

BasicsBasics



Rearranging Rearranging ColumnsColumns

Move Column left or right

Change Column Width

► Click AND DRAG to…

► Click and drag EDGES to…



FreezingFreezingandand

SortingSorting ► Context for Field or data actions is “Column” – right-click in header

► “freezing” - “unfreezing” toggle: frozen columns stay on the left of the table and do not scroll.

► You can sort the “ “ActiveActive” ” column from here as well.



Field LabelsField Labelsandand

Hiding FieldsHiding Fields

Table context menus Table context menus don’t set ANY table don’t set ANY table properties…properties…

Instead: “Layer Context Instead: “Layer Context Menu”… in the T.O.C. Menu”… in the T.O.C. pane of the ArcMap pane of the ArcMap windowwindow

… … right-click on the Layer… right-click on the Layer… and pick “Properties”and pick “Properties”

… to change the field’s label, enter a new alias here.

This checkbox makes the field “isible”.

Population


Your turn…Your turn…

Chapter 2: Step 1 through 9Chapter 2: Step 1 through 9


Editing TablesEditing Tables

Warning:Warning: You are now leaving the You are now leaving the safe, virtual safe, virtual

ArcMap Environment.ArcMap Environment.


Editing vs Data DefinitionEditing vs Data DefinitionKnow Know

what you what you want!want!

Editing:► means changing attribute

values. ► requires “Edit Mode”

Adding & Deleting Fields:► is not considered “Editing”► can’t be done in edit mode.

1. Delete a field: the context is an existing field, so right click the field’s header.

2. Add a Field: Options menu, (no context) and complete the field definition dialog.

Table Table Option Option MenuMenu


Adding FieldsAdding FieldsField Type Guidelines:Field Type Guidelines:► Use ‘Use ‘texttext’ for fields that contain alpha, or numbers that won’t be used for math’ for fields that contain alpha, or numbers that won’t be used for math

Like zip codes: you don’t want the text ‘03824’ to display as a number 3,824Like zip codes: you don’t want the text ‘03824’ to display as a number 3,824► Use ‘Use ‘shortshort’ or ‘long’ for integers (numbers that will require no decimal places i.e. ‘scale’ = 0)’ or ‘long’ for integers (numbers that will require no decimal places i.e. ‘scale’ = 0)

‘‘Short’ for numbers between -32,000 and +32,000Short’ for numbers between -32,000 and +32,000 ‘‘Long’ for numbers between about -2 billion and +2 billion Long’ for numbers between about -2 billion and +2 billion

► Use floating point for fractional numbers (require decimal places)Use floating point for fractional numbers (require decimal places) Single floating point – aka ‘float’ – for precision < 7Single floating point – aka ‘float’ – for precision < 7 Double floating point – aka ‘double’ – for precision >6Double floating point – aka ‘double’ – for precision >6

Don’t worry too much:Don’t worry too much: If you ask for the wrong kind of field, for the number of If you ask for the wrong kind of field, for the number of decimal places requested, ArcGIS will pick the right field type for you. decimal places requested, ArcGIS will pick the right field type for you.


Editing TablesEditing TablesEntering Entering

Edit ModeEdit Mode

► Use the selection in Use the selection in the the TTools Menuools Menu

oror

Editor Bar Editor Bar appears appears

here…here…

► Right-click anywhere Right-click anywhere in the window margins in the window margins & pick “Editor”& pick “Editor”

But But can be can be ““dockeddocked

” here.” here.

► Use the Edit Use the Edit IconIcon oror

1.1. Add the “Add the “Edit Edit ToolbarToolbar”.”.

2.2. CLOSE TABLES CLOSE TABLES THAT YOU WANT THAT YOU WANT TO EDIT FIRST!TO EDIT FIRST!

3.3. Select ESelect EDITORDITOR M MENUENU


Editing TablesEditing TablesChanging Changing Attribute Attribute ValuesValues

Now that you’re in

Edit Mode: What do you want to do?

Change one or two values?

Create new values that are calculated from existing ones?

Change values in a set of records that are all related by common attribute value?

Add a field?

Delete a field?

► Edit CellsEdit Cells

► CalculatorCalculator

► SelectionSelection

► Get out of Edit Get out of Edit ModeMode

► Get out of Edit Get out of Edit ModeMode

white=editable

white=editable

white=editable

white=editable

pencil=edit modepencil=edit mode

pencil=edit modepencil=edit mode


Editing TablesEditing TablesChanging Changing Attribute Attribute ValuesValues

► Edit CellsEdit Cells

► CalculatorCalculator

► SelectionSelection

To edit single values, just put the cursor in the cell, and type.

To calculate based on other values in the table, right-click the header, select CALCULATE VALUES. and enter a formula.

With no selected records: formula calculates how many toes for every record... ..in this case there is one selected record so the formula calculates only for that record.

BE CAREFUL WHAT IS SELECTED!!


Your turn…Your turn…

Chapter 2: Step 10 through ENDChapter 2: Step 10 through END

Unit Two: Attribute Tables In this unit… ► Features & properties Basic features Rearranging...

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