editing how to make your own!. esf laboratory for applied gis 2 orthophoto background green is...

EDITING

How to make your own!

esf Laboratory for Applied GIS

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Orthophoto background

Green is County boundary

Yellow is soils layer (NRCS)

This is called the “Coincident Line” problem


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File types

• Shape files• FC• Coverages

– ArcINFO format– PC ArcInfo format

• Rasters of various kinds• TINs (Triangulated Irregular

Networks)• Networks

Can editCan editCannot edit in ArcMap

Can’t even open in ArcMap* nope Yup

Yup

* Open in ArcView 3.3 & save as a shapefile


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Editing Steps

1. Load only the data needed for editing into ArcMap

2. Click on the “Selection” tab at the bottom of the TOC (demo)

3. Make sure only the layer to be edited is selected

4. This gets around the Booby Trap of having the wrong layer in the Target window!

Setup

• Load Edit toolbar• Set Task• Set Target


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Set Snapping

• Snapping environment– Select “snapping” from Edit dropdown– Priority of snapping

is the order of thelayers (drag ‘em’).

– In this case the mills will be snapped to the road’s edges.

– Set snapping Tolerance (how close for jump)– Edit/options


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Snapping tricks

• Press “T” will show you what the current snapping tolerance is…

• If you need to change the snapping tolerance often then load the interactive snap tolerance toll to any tool bar– Rt clk blank spot on menu bar, scroll down

to the bottome of the list that appears and click cutomize. Click the Command tab and then Edit and scroll down to the tool

– Drag it to any tool bar (Edit, perhaps)– Clicking on the tool allows you to draw a

circle that is the snapping tolerance you need.


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Setting Snapping Stuff

Pixels or map units

No, No, No

Distance between vertices

Number of vertices to be deleted when you

screw up – and you will when using stream

mode!

Tip says what you are snapped to


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Sketch Construction Tools: Sketch tool

Use the Sketch tool to create point features and digitize the vertices of line or polygon features. After you finish the sketch, ArcMap adds the finalsegment, and the sketch turns into a feature.


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Sketch Construction Tools: ArcTool

The Arc tool helps you create a segment that isa parametric (true) curve. Instead of being made of numerous vertices, a parametric curve has only two vertices as endpoints.


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Sketch Construction Tools - midpoint

The Midpoint tool lets you define the location of the next vertex by clicking two points; the new vertex is placed at the midpoint of the line between these points.


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Midpoint tool?


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Sketch Construction Tools

The Trace tool helps you create segments that Follow along parallel to an existing segment.


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Trace tool

• Traces along an existing line features (instead of typing the angle and length of each segment.)

• select the parcel features before you can start tracing the road casing feature.

• The Trace tool only follows selected features.


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Split Poly Tool

• Use the “Cut Polygon Features” task• Why

– Makes a perfect match between polys when Split – every time and…

– Select poly to split with the Edit Tool • Use pencil tool to draw a line

through the poly where you want it split

• Rt click anywhere to finish the job

IMPORTANT STUFF

• 3Ts– TARGET– TASK– TOOL

• 3Ss– Snapping What– Snapping distance– Selection


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editing how to make your own!. esf laboratory for applied gis 2 orthophoto background green is...

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