editing basics (in arcgis 9.2) by alma vargas. levels of desktop arcgis arc view version that most...
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Editing Basics(in ArcGIS 9.2)
By Alma Vargas
Levels of Desktop ArcGIS
• Arc View • Version that most clients will use
• The version that this session will focus on
• Arc Editor• Limited capabilities, but more than the ArcView
version
• The version that the Advanced Editing session will use
• Arc INFO • Have all editing functionality available
* All of the above versions come with Arc Catalog & Arc Toolbox
File Formats that Can be Edited Using ArcGIS
• Shapefiles (carry-over from ArcView 3.x)
• Personal Geodatabases (new format – most commonly used)
• Multi-User Geodatabases (new format) (for extremely large datasets)
COVERAGES cannot be edited in Arc GIS and Shape files have limited editing capabilities in Arc GIS!!!
Editing Map Data in ArcGIS
Important Data Layers to Edit:
• Points − Schools
− Students
• Lines− Street Networks
− Railroads
− Rivers
• Polygons − Study Areas
− Attendance Areas
− Development Tracts
− Lakes
• Open ArcMap• Add Data Layers• Customize Look of Layers• Zoom into Specific Area• Set Selectable Layers• Start Editing• Set Target• Set Task• Notice Editor Toolbar (Edit Tool & Sketch
Tool)• Set Snapping Environment
Steps to Set Up Editing in Arc GIS…
Open a newMap Document
and add theData Layers
ArcView
Steps to Set Up Editing in ArcGIS
Set the data up the way you want it to look.
Then zoom-in to a specific area.
ArcView
ArcView
Steps to Set Up Editing in ArcGIS
First you need the Editor toolbar to be available.
Or you can load the Editor toolbar by right-clicking on the top section and making sure that there is a check near “Editor.”
The Editor Toolbar “button” opens and closes the Editor toolbar.
Steps to Set Up Editing in ArcGIS
Set the Selectable Layer (the one you want to edit)
ArcView
Steps to Set Up Editing in ArcGIS
After starting an edit session, more items on the Editor
toolbar become active.
ArcView
Steps to Set Up Editing in ArcGIS
Once you start your edit session, you need to assign a TARGET
layer and select a TASK.
Steps to Set Up Editing in ArcGIS
DEPENDING ON YOUR TASK, NEW TOOLS ARE NOW AVAILABLE.
ArcView
The Sketch Tool (is used to draw lines or shapes)
The Edit Tool (is used for selecting features)
Steps to Set Up Editing in ArcGIS
Steps to Set Up Editing in ArcGIS
Next, you will need to choose what elements you would like the cursor to
“snap” to.
Setting up the “Snapping”
Environment!
First, you will need to set up your “Snapping”
environment….
ArcView
ArcView
You will also need to open the Options window and …
…and check on the SNAP TIPS
Set/check the snapping tolerance…
Setting up the “Snapping”
Environment!
Steps to Set Up Editing in ArcGIS
Exercise Editing Basics in ArcGIS
• Set Selectable Layers
• Start Editing
• Set Task (Cut Polygon Features)
• Set Target (start with Study Areas)
• Notice Editor Toolbar (Edit Tool & Sketch Tool)
• Set Snapping Environment
Setting Up the Editing Environment
Editing Data In ArcGIS
Let’s split a Study Area and see what happens…
Editing Polygons
A “sketch” is generated. This
represents the most current edit where
it appears with vertices and
endpoints and a small “x” next to the sketch. Once you complete the
sketch (double-click) then it
appears light blue (selected).
Editing Polygons (cont’d.)
Editing Data In ArcGIS
* Now we need to edit the attributes and give them new unique Study Area numbers.
Attributes button
Change Study Area number
Editing Data In ArcGISEditing Polygons (cont’d.)
The labels also automatically update.
Editing Data In ArcGISEditing Polygons (cont’d.)
Editing “Streets”Set up the edit environment.
Set up snapping.
Editing Data In ArcGIS
Adding a street.
Editing Streets (cont’d.)
A “sketch” of the new street.
Adding attributes to the street.
Editing Data In ArcGIS
Editing Points
2. Adding School Sites.
1. Setting the
environment.
Adding Adding attributes to attributes to the school.the school.
A “sketch” of the new school.
Editing Data In ArcGIS
Editing Data In ArcGIS - Editing Tables
Right-click on the layer namein the legend and
open the Attribute Table
NOTICE THAT THE HEADERS NAMES ARE WHITE AND NOT GRAY.Now we can change the information in the cells for each record.
You can change them individually or you can select multiple recordsand CALCULATE a particular field (column) all at the same time with
the same information (i.e.: changing a Study Area number for many projects).
Undoing Your Edits in ArcGIS
Undo Button
Under the Edit pull-down menu, Undo (Ctrl+Z)/Redo (Ctrl+Y)
When you stop editing, select no to “saving edits”
Upon exit, select no to “saving edits”
Delete key
Saving Your Edits in ArcGIS
During an edit session
–Save Edits
–Stop Editing/Save Edits
After you have stopped editing & want to exit
–Save Edits
–Stop Editing/Save Edits
–Save the map document / Ctrl+S (option)
–Exit ArcMap
Other Editing Options
Task pull-down menu
TOOL Buttons Menu (cursor
functions)
SketchIntersection
Arc
End Point Arc
Tangent Midpoint
Distance-Distance Direction-
Distance
Trace
The task to choose depends upon the data layer you are
editing.
Editing Basics (ArcGIS 9.2)
QUESTIONS?