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When a user acquires a particular data set of interest, it is rarely in the exact form that is needed during analysis. This tutorial describes how to change the data to make it more appropriate to the scope of the project. Data can be prepared using ArcToolbox accessible through either ArcCatalog or ArcMap for the purposes of this tutorial we have chosen to use ArcMap to interface with ArcToolbox. It is often the case that we are only interested in a particular feature or features of an acquired data set and that the others are unnecessary to our purposes. We can extract only those features we need by selecting them and saving them in a new output feature class. To select a feature of interest, the user must click the ArcToolbox Analysis Tools menu followed by Extract and then Select. In the Select tool dialog box, you may select the Input Features from the drop?down menu or browse to the feature. After specifying a name and location for the Output Feature Class move next to the Expression option. If you are not familiar or don’t know the fields with which to structure an expression use the Query Builder accessible through the SQL button. From the list of fields, operators, and unique values put together an SQL query statement to select which features you want. Sometimes the acquired data sets cover a greater area than the user is interested in. The data set can be clipped to the area of interest by using features in one layer to clip the features in another layer. To clip one layer based on another, the user must us Clip found in the Extract portion of Analysis Tools in ArcToolbox. To find out more about the Clip operation, the Help button can be clicked. In the following example a state of Arkansas polygon was used to clip a Metropolitan Statistical Area layer. The resulting layer is a clipped msa layer that only shows the Metropolitan Statistical Areas in Arkansas. In the Dissolve dialog box, you may select the Input Features from the drop?down menu or browse to the feature. After specifying a name and location for the Output Feature Class move next to the Dissolve_Field(s) option.
Tags : metropolitan statistical areas, metropolitan statistical area, feature class, input features, arcmap, query statement, arccatalog, analysis content, query builder, state of arkansas, sql query, analysis tools, polygon, drop down menu, msa
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