Creating a mask layer

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Creating a mask layer	Randy .	Jan 06, 2010
Re: Creating a mask layer	Saqib Mehmood	Jan 06, 2010
Re: Creating a mask layer	David B	Jan 07, 2010
Re: Creating a mask layer	Randy .	Jan 07, 2010

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Subject	Creating a mask layer
Author	Randy .
Date	Jan 06, 2010
Message	I've got a study area (polygon) I like to stand out. Is there a way in ArcMap to mask out everything outside the polygon without having to create a mask feature class for the original feature class? In the example above the there is only one polygon. I'd like to mask out the reverse. Is this possible?

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Subject	Re: Creating a mask layer
Author	Saqib Mehmood
Date	Jan 06, 2010
Message	You can display a subset of a single layer using definition query. Please take a look at the following link: http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Displaying_a_subset_of_features_in_a_layer
	Saqib Mehmood saqibqureshi@gmail.com

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Subject	Re: Creating a mask layer
Author	David B
Date	Jan 07, 2010
Message	Maybe use the data frame clipping options? Open Date Frame Properties dialog > Data Frame tab and set the options to clip using the study area polygon feature

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Subject	Re: Creating a mask layer
Author	Randy .
Date	Jan 07, 2010
Message	Thanks David that is pretty close but will work for my current map. The down side is that the Data Frame "clip to shape" clips all layers. Saqib, definition query doesn't work here. I only have "One" polygon in the feature class. In the old ArcPlot / coverage days I could specify the Null polygon.