tutorial4 - University of Arkansas Libraries ArcGIS Desktop...

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University of Arkansas Libraries ArcGIS Desktop Tutorial (http://libinfo.uark.edu/gis/tutorial.asp) Section 4 Page 1 Section 4: Preparing Data for Analysis 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. Selecting Features: 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 .
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University of Arkansas ArcGIS Desktop (http://libinfo.uark.edu/gis/tutorial.asp) Libraries Tutorial Section 4 Page 2
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University of Arkansas Libraries ArcGIS Desktop Tutorial (http://libinfo.uark.edu/gis/tutorial.asp) Section 4 Page 3 The Select tool dialog box opens. 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. Once the statement has been formulated, the OK button on the Query Builder should be clicked. Then the OK button on the Select dialog box. The output is automatically added to the map display. If the user wishes to learn more about the dissolve operation, the Help button should be selected.
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University of Arkansas ArcGIS Desktop Libraries Tutorial (http://libinfo.uark.edu/gis/tutorial.asp) Section 4 Page 4 Remove the layer that you are no longer in need of by performing a right mouse click and selecting Remove from the pop up menu.
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University of Arkansas ArcGIS Desktop (http://libinfo.uark.edu/gis/tutorial.asp) Libraries Tutorial Section 4 Page 5
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University of Arkansas Libraries ArcGIS Desktop Tutorial (http://libinfo.uark.edu/gis/tutorial.asp) Section 4 Page 6 Clipping Features : 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.
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  • Spring '10
  • Arshad
  • Coordinate system, University of Arkansas, ArcGIS Desktop Tutorial, Libraries ArcGIS Desktop, Arkansas Libraries ArcGIS

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