Name: Adams_NTWI.tif

Display Field:

Type: Raster Layer

Geometry Type: null

Description: GIS raster dataset displaying Topographic Wetness Index (TWI) for north Adams County, PA. This TWI raster was derived from the 2006-08 PAMAP LiDAR DEM data. The TauDEM extension (D-Infinity tools) for ArcMap was used to create flow direction, slope, and contributing area rasters. TWI was then calculated using the following equation: Ln (Contributing Area/Slope). The methodology was described by Cody Fink in his 2013 thesis entitled Dynamic Soil Property Change in Response to Natural Gas Development in Pennsylvania. TWI results in a dimesionless raster and should be displayed using a red (low values representing no flow) to blue (high, representing high probability flowpaths) color gradient. TWI results vary depending on raster size and analysis options so value thresholds for probability-based overland flowpaths for water should be field verified.

Copyright Text: Jamie Shallenberger, SRBC, and Cody M. Fink.

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Spatial Reference: 102729  (2272)  LatestVCSWkid(0)

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