1. Unit Two: Attribute Tables In this unit… ► Features & properties  Basic features  Rearranging columns  Freezing & Sorting columns  Field Labels & Hiding fields ► Editing Tables  Entering Edit Mode (!?)  Changing Attribute values ► Review ► Opening Tables ► Arranging and Moving Windows

2. Unit Two – Attribute Tables 2 Review – GIS Data Types ► “ Feature Data”  Data Structures: ► “Shapefiles” ► “Coverages” ► “Geodatabases”  Examples: ► Lakes ► Houses ► Roads ► “Image Data”  Data Structures: ► image e.g. “Digital Raster Graphic” (DRG) ► “GRID” ► “Digital Elevation Model” (DEM)  Examples: ► Aerial photo ► Image of USGS topo

3. Unit Two – Attribute Tables 3 Review Each “Record” in the table… …Connected to a “Feature” in the “Feature Data” THIS is the heart of GIS! THIS is the heart of GIS!

4. Unit Two – Attribute Tables 4 Review Attribute Tables – Just Columns & Rows. When tables contain the attributes of geospatial features, the power of the data in the table is expanded… every value can be represented graphically on a map!

5. Unit Two – Attribute Tables 5 Review We want “Attributes” of a “Layer”, so… Opening an Attribute Table Context is Layer …right click and select “Open Attribute Table”

6. Unit Two – Attribute Tables 6 Arranging and Moving Windows 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 3.x users! Learn to cope.

7. Unit Two – Attribute Tables 7 Arranging and Moving Windows You can always minimize windows… They go to the bottom of the screen. ► ► Better: re-arrange the windows altogether But look… both windows are “Active” ► ► You can take action in both windows…and ► re-size them by dragging the corners or borders. ► Just drag them using the title bar…

8. Unit Two – Attribute Tables 8 Table Features and Properties ► ► Some window features:   Current record   Record advance   Show All / Show Selected toggle   Selected record counter   Options button Active Make Column Active Select a Row ► ► Click HERE to… ► ► and HERE to… Table Option Menu Basics

9. Unit Two – Attribute Tables 9 Table Features and Properties Rearranging Columns Move Column left or right Change Column Width ► ► Click AND DRAG to… ► ► Click and drag EDGES to…

10. Unit Two – Attribute Tables 10 Table Features and Properties FreezingandSorting ► ► 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. ► “Active” ► You can sort the “Active” column from here as well.

11. Unit Two – Attribute Tables 11 Table Features and Properties Field Labels and Hiding Fields Table context menus don’t set ANY table properties… Instead: “Layer Context Menu”… in the T.O.C. pane of the ArcMap window … right-click on the Layer… and pick “Properties” … to change the field’s label, enter a new alias here. 4 This checkbox makes the field “ 4 isible”. Population

12. Unit Two – Attribute Tables 12 Your turn… Chapter 2: Step 1 through 9

13. Unit Two – Attribute Tables 13 Editing Tables Warning: You are now leaving the safe, virtual ArcMap Environment.

14. Unit Two – Attribute Tables 14 Editing vs Data Definition Know what you want! Editing: ► ► means changing attribute values. ► ► requires “Edit Mode” Adding & Deleting Fields: ► ► is not considered “Editing” ► ► can’t be done in edit mode. 1. 1.Delete a field: the context is an existing field, so right click the field’s header. 2. 2.Add a Field: Options menu, (no context) and complete the field definition dialog. Table Option Menu

15. Unit Two – Attribute Tables 15 Adding Fields Field Type Guidelines: ► Use ‘text’ 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 3,824 ► Use ‘short’ or ‘long’ for integers (numbers that will require no decimal places i.e. ‘scale’ = 0)  ‘Short’ for numbers between -32,000 and +32,000  ‘Long’ for numbers between about -2 billion and +2 billion ► Use floating point for fractional numbers (require decimal places)  Single floating point – aka ‘float’ – for precision < 7  Double floating point – aka ‘double’ – for precision >6 Don’t worry too much: 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.

16. Unit Two – Attribute Tables 16 Editing Tables Entering Edit Mode ► Use the selection in the Tools Menu or Editor Bar appears here… ► Right-click anywhere in the window margins & pick “Editor” But can be “docked ” here. ► Use the Edit Icon or 1. Add the “Edit Toolbar”. 2. CLOSE TABLES THAT YOU WANT TO EDIT FIRST! 3. Select E DITOR M ENU

17. Unit Two – Attribute Tables 17 Editing Tables Changing Attribute Values 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 Cells ► Calculator ► Selection ► Get out of Edit Mode white=editable pencil=edit mode

18. Unit Two – Attribute Tables 18 Editing Tables Changing Attribute Values ► Edit Cells ► Calculator ► Selection 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 C ALCULATE V ALUES. 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!!

19. Unit Two – Attribute Tables 19 Your turn… Chapter 2: Step 10 through END