Hawth's Analysis Tools for ArcGIS

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 Summary

ADD AREA TOOL
Input: a polygon feature layer
Output: a new or updated AREA field in the attribute table
Features:

• adds a new field or updates existing fields with the AREA and/or PERIMETER of each polygon (in coordinate system units)
• the user can specify a multiplier constant that is applied to each area/perimieter value to change the units (e.g. if the data is in UTM, then applying a multiplier of 0.000001 to the area field will result in the units being km^2 instead of m^2)

Limitations:

• may not work with geodatabases

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 Help

Getting started. A polygon feature layer must be loaded into ArcMap in order to use this tool. Select the feature layer you wish to process from the drop-down box and choose between the option to add new field(s) or updates existing field(s). You can add/update either AREA, or PERIMETER, or both - this is controlled using the AREA and PERIMETER check mark boxes. If you are adding new fields note that the field names should be 10 characters or shorter, with no spaces or special characters (e.g. %*,';:" etc), and should not start with a number.

Converting units. You can activate the multiplier by checking the "Convert area units" box or the "Convert perimeter units" box. Note that by default the units are the units of the coordinate system (AREA: m^2 for UTM, ft^2 for SPC, etc; PERIMETER: m for UTM, ft for SPC, etc). If you use a multiplier for the area and perimeter, note that the multiplier for the perimeter will almost always be the square root of the multiplier for the area.