Dear List,

I am dealing with hundreds of shape files. (generated by ArcGIS 9.3)
They are composed of multiple polygons.
The polygons are classified as 1, 2, 3, and 4 according to their seasonal
status.

I want to calculate the total areas of each shape files.
Furthermore, the areas of 1, 2, 3, and 4 are also needed to be computed for
each shape file.

Please kindly advise if it is possible to use R packages and functions are
suitable for the tasks.
(may be adehabitat)
Thank you.

Elaine

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