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30-m Topographic Wetness Index

Published by National Park Service | Department of the Interior | Catalog Last Checked: January 07, 2026 at 11:13 AM | Dataset Last Updated: March 17, 2014 at 12:00 AM
The lidar Topographic Wetness Index (TWI) is the TWI data product produced and distributed by the National Park Service, Great Smoky Mountains National Park. Concave, low gradient areas will gather water (low TWI values), whereas steep, convex areas will shed water (high TWI values). Values range range from less than 1 (dry cells) to greater than 20 (wet cells).

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