school of geography faculty of environment introduction to editing
TRANSCRIPT
School of GeographyFACULTY OF ENVIRONMENT
Introduction to Editing
ArcGIS Editor Toolbar
• All editing functions are controlled through the toolbar
Edit Menu
Edit Tool
Sketch Tool
Task List
Target Layer
Split Tool Rotate Tool
Attribute
Dialog
Sketch
Properties
Common Editing Tasks
• Create New Data
• Create new geometry (coordinates that represent points, lines polygons)
• Update new attributes
• Edit Existing Data
• Edit and update geometry
• Edit and update attributes
Create and Edit Features
Choose
Data FrameStart Editing
Set the Target
Layer
Set Options
Snapping tolerance
sets distance at which
snapping will occur
Sticky tolerance
determines how far
an object has to move
before it does
Create New Features
• Task should be set to Create New Feature
• Most common tool: Sketch tool
• Click with your left mouse button and you create a vertex
• Double click and you end the feature
Vertex
Sketch Tool
Working with Sketches
Right clicking and moving away from a vertex
Right clicking
on last drawn vertex
Edit Attributes
• Add values or copy/cut paste them for a single or multiple selected features
Attribute
Values
Edit the Values of a Vertex
• Edit Sketch Properties dialog
• Highlight a vertex
• Can edit values directly
End the Editing Session
• Stop editing without saving changes OR
• Stop editing and save the changes made OR
• Save edits and continue making changes
Editing Lines – How to Start?
• How do I start constructing a line?
• Start with a vertex
• Absolute X,Y
• Snap to existing vertex or end
• Creating vertices based on other features
• Parallel, perpendicular, etc.
• Distance, direction, segment deflection, etc.
Editing Lines
• can extend or trim a line based on another feature
Line is extendedLine is trimmed
Creating Curves
• Use Arc, End Point Arc or Tangent tool
• Which one should you use? Need to experiment!
Arc
Tangent
Arc End Point
Creating Polygons
• Start with a vertex
• Digitise a set of vertices
• Double click on the starting vertex to end the polygon
• Digitise on a backdrop map
• Can create other vertices based on measurements (e.g. deflection and length) – then use Square and Finish function
Editing Existing Polygons
• Modify/Reshape/Cut Polygon
• Split an existing polygon into two
• Or change just a single vertex
Editing Points, Lines and Polygons
Hands-on Exercise #9