GEOL 452/552 - GIS for Geoscientists I
Basic ArcGIS editing tasks
Lecture 18 - editing (chapter 12)
! 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
• 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
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The Editor Toolbar
• 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: Press
or
Customize-Toolbars-Editor
2
Create a new layer for the new
features (using Arc Catalog)
•
Create a new File Geodatabase in
U:\ArcGIS\mgisdata\Austin
called Edwards
Editor Tool bar will be greyed out - that’s OK!
Rename New File Geodatabase
into Edwards
U:\ArcGIS
Edwards.gdb
line
polygon
points
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Make it
your
Default
GeoDB
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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
What about Coordinate systems?
! ArcMap can edit across coordinate systems, e.g.:
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" 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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The Editor toolbar
Start Editing mode
alone
•
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
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Alternative ways to the Editing Windows
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8
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Feature templates
The Edit tool
! 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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Editing context menus
Adding features
Sketch menu
U Choose template and construction tool
U 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.”
Re
ve d = c
rte
x urren
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Vertex menu
Right-click on
sketch (vertex,line)
Right-click outside
sketch
t
Freshly created
Feature
(even smells good ...)
Sketch in Progress
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T:3:#
(11-G+2
Centroid
Automatically
selected
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Avoiding dangles
Setting snapping
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Snapping
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Automatically connects new point to existing point
or line
Tolerance units
vertex
! Screen units
A dangle error — the two
lines fail to physically
connect
" 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
Correct topology—the
horizontal line intersects
the vertical one, creating
three lines.
Circle: Snap distance around
mouse cursor
b
end
point of
line is
dragged
inside
the
SNAP!
snapped
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Types of snapping
Saving work
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Sketching - summary
The Sketch menu
• 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:
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– 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)
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Edit Sketch Properties
Attributes window
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Wrap up
Editing attributes
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•
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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?
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