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Workshop 4Symbology in ArcMap

Displaying SymbolsClick on plus and minus signs to the left of the layer name to expand or collapse layer names and/or symbology.

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Class Exercise•Open C:\ArcGIS Training Materials \Symbology\Symbology_Doc1.mxd•Zoom in to 1:100,000 scale•Drag the Quaternary Geology layer beneath the Base Map layer. •Drag the Quaternary Geology layer above the Base Map layer.•When are the Base Map layers NOT visible?

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Drawing Order Affects What You See!

Solid Fill Polygon Layer On Top of Base Map Layer = Base Map Layers Not Visible

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Solid Fill Polygon Layer Beneath Base Map Layer = Base Map Layers Visible

Drawing Order Affects What You See!

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Fill Color and TransparencyTo “see through” a polygon layer, there are two options:

1.Set the Fill Color to No Color in the Symbol Selector dialog box. (Hint: You may need to reset your Outline Color to distinguish this layer from other layers.)

OR2. Set a Transparency percentage in the Properties/Display dialog box.

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Setting Fill Colorto “No Color” Select “No Color” from the Fill Color box.

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Result:

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Setting TransparencyOpen Properties dialog box by double clicking on the layer name. Select the Display tab. Type in a transparency percentage.

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Result:

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Symbology Types• Features Single Symbol

• Categories Unique ValuesUnique

Values/Many Fields

• Quantities Graduated ColorsGraduated Symbols

• Multiple Attributes Quantity by Category

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Features (Single Symbol)Every feature is given the same symbol.

In this example, dams in CT are represented by a red dot.

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Go to the Symbol Selector dialog box by clicking on the symbol in the legend.

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The Symbol Dialog Box

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Point Example – Boat Launches

Start with a custom color

Choose a shape, size,and angle

View the result

Creating and Modifying Symbols

Finding New Symbols

There are many other sets of symbols available

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Creating and Modifying Symbols

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Polygon Example – DEP Property

Start with a custom color

Add a marker fill

View the result

Categories (Unique Values)Features are grouped according to a value in a field.

In this example, DEP Property is grouped by Area Type.

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Categories (Unique Values, Many Fields)

Features are grouped according to values from more than one field.

In this example, aquifer protection areas are symbolized by two fields: Av_legend and Adopted.

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Quantities (Graduated Colors)

Features are symbolized according to quantitative data.

In this example, different colors depict town population.

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Quantities (Graduated Symbols)

Features are symbolized according to quantitative data.

In this example, different size points depict town population.

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Multiple Attributes (Quantity by Category)

Features are symbolized according to categorical and quantitative data. In this example, Pop./sq. mile and Description are shown.

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Environmental Justice Areas

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DEP’s Layer Files

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Characterized by “.lyr”.

Does not contain actual spatial or attribute data, only “points to” data

Contains “instructions” for displaying symbology

Can have multiple datasets in one layer

Saving a Layer FileIf you custom symbolize a layer, you might want to save it for use in this .mxd and other .mxd’s.

Right click on the layer name in ArcMap, choose “Save as Layer File…” and specify a location in which to save your file. Symbology in ArcMap 24