• chapter 12 - Basic editing (add/change features)• How to create new features with attribute settings• We will skip Chapter 13 (More Editing Techniques,

including topology, very useful for creating/correcting a geological map)

• Hands-on editing demo using the ch. 12 tutorial• U:\ArcGIS\mgisdata\MapDocuments\ex_12a.mxd

GEOL 452/552 - GIS for Geoscientists I

Lecture 18 - editing (chapter 12)

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Basic ArcGIS editing tasks! Digitize new features from a paper

map or scanned map.! Examples: field boundaries, roads,

rock contacts, faults, etc. (other examples from your background?)

! Construct new features from survey descriptions based on air photos or satellite imagery.

! Update features that have changed since they were created, or fix errors.

! Update or correct attributes of features.

! Advanced: create and validate 2

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• Create/change vector data geometry and attribute values interactively (“digitizing”)

• Edit features in an existing layer or make a new layer for new features (via ArcCatalog!)

• Need to find the Editor toolbar

• Activate: Pressor Customize-Toolbars-Editor

The Editor Toolbar

Editor Tool bar will be greyed out - that’s OK!

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Create a new layer for the new features (using Arc Catalog)

• Create a new File Geodatabase in U:\ArcGIS\mgisdata\Austin called Edwards

U:\ArcGIS

Edwards.gdb

Rename New File Geodatabase into Edwards

Make it your Default GeoDB

linepolygonpoints

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• Make a new feature class (“layer”) called faults inside the Edwards GeoDB• Set faults coordinate system to NAD 1983 Texas State Plane Central

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What about Coordinate systems?

! ArcMap can edit across coordinate systems, e.g.:"GPS points layer file has unprojected GCS "Editing is performed in the data frame’s UTM and

converted on the fly"But: Edited GPS points are permanently stored in GCS

when edit mode is left.

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Start Editing mode

• Editor bar will get color (not be greyed out any more)• An new Window called Create Feature will appear• Create Feature shows the faults layer from the TOC• The Construction Tools part shows different Feature Templates - use

the simple Line for now

alone

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The Editor toolbar

Alternative ways to the Editing Windows8

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Feature templates! Feature templates store all info needed to

add a feature to a feature class.! They also have different construction tools

that can be used to create new features.

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The Edit tool;)7(#(++/

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Adding featuresU Choose template and construction toolU With edit tool, click inside map to create vertices

of a “sketch”U You can Zoom, pan, etc., resume sketch with U Double-click or F2 to “finish the sketch.”

Sketch in Progress

Freshly created Feature (even smells good ...)

Centroid

Automatically selected

Red = current

vertex

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(11-G+2

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Editing context menus Sketch menu

Right-click outside sketch

Vertex menuRight-click on sketch (vertex,line)

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Avoiding dangles

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13

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Setting snapping

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Snapping

Correct topology—the horizontal line intersects the vertical one, creating three lines.

A dangle error — the two lines fail to physically connect

vertex

Automatically connects new point to existing point or line

Circle: Snap distance around mouse cursor

end point of line is dragged inside the

b

SNAP! snapped

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Tolerance units

! Screen units"User sets the tolerance

as the number of pixels on the screen.

"Remains consistent regardless of the zoom level.

"Easy to work with at all scales

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Types of snapping0%#"1%$..2%&

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Saving work

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The Sketch menu

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• Temporary sketch for creating new features • Select layer to add feature to (target layer) and press pencil

button • You can use zoom, pan while sketching (click sketch button

again to go back)• Right-click: pulldown menu for context menus:

– On vertex: vertex menu – Not on vertex: sketch menu

• Double click to end sketch and create actual new feature (newly made feature will be selected)

• Click on Select tool (Black Arrow) exits sketch mode• Delete feature: Select - Hit Delete Key (Ctrl-Z Undo)

Sketching - summary

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Edit Sketch Properties

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Attributes window

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Editing attributes

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• Ch 12 Tutorial - 31• HW10 will be ex 1,2,3,4 extra 5 (due Nov 8)• Mini proj 2 questions?• Mini proj 3 questions?

Wrap up

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