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How can I create geodesic buffers around polygons? I'm on 9.3.1 ArcMap, but I need a programatic solution.

IBUfferConstruction only does geodesic buffers for points.

What are my options?

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If upgrading to ArcGIS 10.1 (which was recently released) is an option, then this that I just read in the "What's New in ArcGIS 10.1" PDF may be of interest.

Geodesic buffering

The Buffer tool now creates true geodesic buffers for line and polygon input data. Prior to 10.1, only input point features would create geodesic buffers.

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