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I'm looking for a way to automatically assign a color to a feature, mainly polylines. I want to do this by populating a field with a value so I can link it to a color. I believe this is possible with representation symbology, but I haven't been able to find out how to use the override field for color. Is there a specific type of field it has to be? Is there some format the attributes have to be, ie RGB values? Perhaps there are other ways to do this as well? I am open to ideas, but representation symbology is what I need the end result to be.

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Do you just want to symbolize based on an attribute? –  Anthony -GISCOE- Mar 15 '11 at 12:53
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up vote 2 down vote accepted

Required - ArcInfo License

Must be using a Personal or File Geodatabase

http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Managing_feature_class_representations

Create a default [subtype] representation you want to automate [See RoadType below] Then set up a rule (creates RuleID)

Apply the Override to all other representations.

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Limitations is set by License Level and Toolbox (for automation) is limited in geoprocessing Features need to be converted to Representation before applying http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=An_overview_of_the_Representation_Management_toolset

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