arc gis期末复习考点第十二章(4)

Step 1: Download or make a polygon layer of the study area.

Step 2: Perform a clip operation by using the vegetation map as the input layer and the study area map as the clip layer.

18. Suppose you need a map showing toxic waste sites in your county. You have downloaded a shapefile from the Environmental Protection Agency (EPA) website that shows toxic waste sites in every county of your state. What kind of operation will you use on the EPA map so that you can get only the county you need?

Solution 1: If the shapefile includes a field of county names, then one can run a select operation to select the county of interest.

Solution 2: Download or make a polygon layer of the county, and then perform a clip operation by using the vegetation map as the input layer and the study area map as the clip layer.

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