Calculatearea

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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

Image:image117.gif

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.