copyright © 2006 by maribeth h. price 11-1 chapter 11 basic editing in arcmap
TRANSCRIPT
Copyright © 2006 by Maribeth H. Price
11-1
Chapter 11
Basic Editing in ArcMap
Copyright © 2006 by Maribeth H. Price
11-2
Outline
• Understanding the basic editing process
• Using snapping to ensure topological integrity of features
• Adding features to map layers
• Using the sketch tools and context menus for detailed and precise location of features
• Entering and editing attribute data
Copyright © 2006 by Maribeth H. Price
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What can you edit?
• ArcView– Shapefiles and geodatabase feature classes
• ArcEditor and ArcInfo– Geodatabase networks – Geodatabase topologic features
Coverages can only be edited in the ArcEdit program of ArcInfo. They cannot be edited in ArcMap.
Copyright © 2006 by Maribeth H. Price
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The Editor toolbarMenu
Sketching tools
Task bar
Targetlayer Split Rotate
Sketch Properties
Attribute Editor
Edit tool
Copyright © 2006 by Maribeth H. Price
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Snapping
A dangle—the two lines fail to connect
Correct topology—the horizontal line intersects the vertical one, creating three lines.
nodeAutomatically connects features
Moves the editing cursor exactly to the same point once it gets close.
Copyright © 2006 by Maribeth H. Price
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Snapping tolerance
Snapping tolerance
a
b
ac
b
When edit cursor falls inside tolerance it jumps to the precise location so next point falls in the same spot.
++
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Types of snapping
End snapping
Edge snapping
Vertex snapping
?
Snapping tolerance
+
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Setting snapping
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Editing features
The Edit tool, sketch tool, and Task bar work together when editing
Edit tool
Sketch tool
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Target Layer
Controls which layer new features will be placed in.
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Creating a feature
Double-click to finish sketch
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Editing context menus
Vertex menuSketch menu
Right-click off sketchRight-click
on sketch
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Sketch menu options
Enter absolute point
Enter change in xy
Constrain direction
Constrain length
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More options
90
45
Deflect from sketch Parallel to feature
Deflect from feature Direction and length
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Adjacent polygons
Topological errors between two polygons
Coincident boundary between two polygons
gap
overlap
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Creating adjacent polygons
Draw first polygon with Create New Task
Add new polygon with AutoComplete
Two polygons with coincident boundary.
Copyright © 2006 by Maribeth H. Price
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More tricks
Multipart features Perpendicular edge snapping
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More sketch tools
Distance Arc tool
Intersection Trace toolMidpoint
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Modifying a feature
Click and drag vertices
Sketch keeps track of new figure shape
Double-click when finished
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Rotating features
Select feature
Rotate tool
Drag around rotation point
Click and drag to move rotation point
Copyright © 2006 by Maribeth H. Price
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Splitting polygons
Select polygon to split
Sketch new boundary
Double-click to finish sketch and create polygons
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Attribute Editor
Selected features
Edit all selected Edit single feature
Explore features
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Saving work
Save early, save often!!!
Stops editing and asks to save any unsaved edits
Saves and continues editing
Copyright © 2006 by Maribeth H. Price
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Coordinate systems
• ArcMap can edit across coordinate systems– Edited coordinates always saved to source
file coordinate system regardless of data frame coordinate system
• Projecting on-the-fly may degrade performance– Avoid it when possible
Copyright © 2006 by Maribeth H. Price
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TIPS
• Always have a backup copy
• Shapefiles simplest and most robust
• Keep number of open files down
• Try to keep layers in same coordinate system
• Save frequently!!!!!