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Summary

Instructions provided describe how to symbolize polygons according to what percentage of total area they represent.

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Procedure

Calculate the area of each feature to one field and the total area of all features to a second field. Divide the first field by the second field and place the resulting values into a third field, which is used as the 'Value' field for the layer symbology.

- Generate area values for all polygon features and store them in Field A.
- Right-click Field A, select 'Statistics', and note the 'Sum' value.

**Note:**

If interested in doing this on subsets of the data, perform a series of 'Select by Attributes' operations. For example, "Land Use = Federal". Do this for each selection set, taking note of the sum for each subset.

- Create Field B and use the Field Calculator to attribute the entire field to populate the records with the appropriate sum value.

**Note:**

For selected subsets, calculate the field values only for the selected records.

- Create Field C and using the Field Calculator calculate Field C equal to Field A divided by Field B.
- Symbolize the data based on Field C.