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Calculate Polygon Areas

This tool allows the user to calculate the areas of a selected shapefile and add these to the attributes.

See also the Update Measurements plugin instructions for a plug in that will measure line length, polygon perimeter and area and add these to the attributes.

Click on [GIS Tools]

Click on [Vector]

Click on [Calculate Polygon Areas]

If it cannot detect the shapefile units a warning will show asking if you wish to use the units in the projection. Click OK

The calculate area box appears


Select the layer.

Set the shapefile units

Set the units of the area you want created

If this is the first time, select the 'Use a new field' and give it a new name if required

If there is already an area field, select 'Update an existing Field', and select the field from the list

Click on [Calculate]

Your field will now have the area calculated.

The option to specify decimal places is not in this tool. To specify decimal places, use the Update Measurements Plug-in

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This page has been accessed 1,316 times. This page was last modified on 12 April 2008, at 02:46.