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GEO 383/683 GIS LABS

LAB 2: Displaying, classifying, and symbolizing data in ArcGIS 8.1

• What we mean by symbology.
• What we mean by classification, and why it is important.
• Different classification methods (natural breaks, equal interval, defined interval, quantile, std dev, manual).
• Normalizing (pop density and percentages).
• Understand graduatedand proportional symbols: points, symbols, lines.
• Dynamic, interactive, and manual labels.

Key Software Features
• Color palette (r-click symbol in table of contents).
• Symbol selector (click symbol in table of contents).
• Symbology tab in Layer Properties window.
• Classification dialog (from symbology tab in layer properties).


Changing symbology (all done in layer properties).
• Polygons: change fill and outlines (color, pattern, size).
• Point symbology – shape, size and color.
• Lines - line style, width, color.
• Import from layer file (click import button on symbology tab).
• Setting a layers transparency (layer properties(display tab).

Symbolizingfeatures by categorical attributes (example: road types).

• Symbolizing by attribute (in layer properties and attributes can be text or numeric).
o select field to use.
o using color schemes (color ramps).
o changing individual colors (right click for properties for selected .symbols or properties for all symbols).
Using styles and creating layerfiles
• Styles (preset symbols in Symbol selector).
• Saving layer files (right click layer name in table of contents).
o Remember you are saving the rendering information, NOT THE DATA.

Classifying by standard methods and manual
• classify fields (symbology tab in layer properties and only for numeric fields).
o change colors(right click for properties for selected symbols or properties for all symbols).
o number of classes
o change classification method
o read histogram and edit
o normalizing
• change class labels:
o number format dialog (right click on Label column in symbology tab).
• manual classification (changing values manually,moving histogram bars).
• mapping density (dot density):
o select field
o dot color
o dot value
• Graduated symbols


Dynamic labels

• add labels (right click on data layer(properties)
• layer properties/labels tab to edit labels: label field, font, color, placement, priority, scale range, etc.
•label priority with respect to other data layers (data frame properties/label tab).
• controlling labels (label placement options).
Manual and interactive labeling
• add text manually and edit it (right-click on selected text to get properties).
• interactive labeling: (from draw toolbar).
o click arrow next to the letter A on draw toolbar.
ofind the tool that looks like a tag.
o labels can be moved like any other manual text using the select elements tool from the tools toolbar.
• convert labels to annotation dialog (right click layer), turning annotation on and off.
• Insert title and text (from insert menu).


• Insert(legend.
• Follow wizard.1. Choose what layer you want in your legend.
▪ The ones on the right are all layers available.
▪ The ones on the left are those that are in the legend.
2. Legend title screen.
▪ I recommend not having a title on your legend unless you have multiple legends on your layout.
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