copyright © 2006 by maribeth h. price 11-1 chapter 11 basic editing in arcmap

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

11-3

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

11-4

The Editor toolbarMenu

Sketching tools

Task bar

Targetlayer Split Rotate

Sketch Properties

Attribute Editor

Edit tool

Copyright © 2006 by Maribeth H. Price

11-5

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

11-6

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.

++

Copyright © 2006 by Maribeth H. Price

11-7

Types of snapping

End snapping

Edge snapping

Vertex snapping

?

Snapping tolerance

+

Copyright © 2006 by Maribeth H. Price

11-8

Setting snapping

Copyright © 2006 by Maribeth H. Price

11-9

Editing features

The Edit tool, sketch tool, and Task bar work together when editing

Edit tool

Sketch tool

Copyright © 2006 by Maribeth H. Price

11-10

Target Layer

Controls which layer new features will be placed in.

Copyright © 2006 by Maribeth H. Price

11-11

Creating a feature

Double-click to finish sketch

Copyright © 2006 by Maribeth H. Price

11-12

Editing context menus

Vertex menuSketch menu

Right-click off sketchRight-click

on sketch

Copyright © 2006 by Maribeth H. Price

11-13

Sketch menu options

Enter absolute point

Enter change in xy

Constrain direction

Constrain length

Copyright © 2006 by Maribeth H. Price

11-14

More options

90

45

Deflect from sketch Parallel to feature

Deflect from feature Direction and length

Copyright © 2006 by Maribeth H. Price

11-15

Adjacent polygons

Topological errors between two polygons

Coincident boundary between two polygons

gap

overlap

Copyright © 2006 by Maribeth H. Price

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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

11-17

More tricks

Multipart features Perpendicular edge snapping

Copyright © 2006 by Maribeth H. Price

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More sketch tools

Distance Arc tool

Intersection Trace toolMidpoint

Copyright © 2006 by Maribeth H. Price

11-19

Modifying a feature

Click and drag vertices

Sketch keeps track of new figure shape

Double-click when finished

Copyright © 2006 by Maribeth H. Price

11-20

Rotating features

Select feature

Rotate tool

Drag around rotation point

Click and drag to move rotation point

Copyright © 2006 by Maribeth H. Price

11-21

Splitting polygons

Select polygon to split

Sketch new boundary

Double-click to finish sketch and create polygons

Copyright © 2006 by Maribeth H. Price

11-22

Attribute Editor

Selected features

Edit all selected Edit single feature

Explore features

Copyright © 2006 by Maribeth H. Price

11-23

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

11-24

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

11-25

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!!!!!