Rowley, T.H., Hopkins, K.G., and Terziotti, S., 2018, Geomorphological Features of North Carolina: U.S. Geological Survey data release, https://doi.org/10.5066/P9PRAVAQ.
Summary
A raster of the ten most common geomorphic landscape forms in North Carolina. Common geomorphic forms were identified using light detection and ranging (lidar) derived digital elevation models (DEM) with a resolution of 30 ft. (~10m). Common forms were created using r.geomorphon, a feature in GRASS GIS (Stepinski et al., 2011; Jasiewicz et al., 2013). Geomorphon requires a user input search radius and flatness threshold. A search radius of 60 cells (1800 ft.) was used for the entire state and two different flatness thresholds values of 1 degree for portions of the state in the Blue Ridge/Piedmont ecoregion and 0.0001 degree for portions of the state in the Coastal Plain ecoregion. Stepinski, T., Jasiewicz, J., 2011, Geomorphons - [...]
Summary
A raster of the ten most common geomorphic landscape forms in North Carolina. Common geomorphic forms were identified using light detection and ranging (lidar) derived digital elevation models (DEM) with a resolution of 30 ft. (~10m). Common forms were created using r.geomorphon, a feature in GRASS GIS (Stepinski et al., 2011; Jasiewicz et al., 2013). Geomorphon requires a user input search radius and flatness threshold. A search radius of 60 cells (1800 ft.) was used for the entire state and two different flatness thresholds values of 1 degree for portions of the state in the Blue Ridge/Piedmont ecoregion and 0.0001 degree for portions of the state in the Coastal Plain ecoregion.
Stepinski, T., Jasiewicz, J., 2011, Geomorphons - a new approach to classification of landform, in : Eds: Hengl, T.,
Evans, I.S., Wilson, J.P., and Gould, M., Proceedings of Geomorphometry 2011, Redlands, 109-112 (PDF)
Jasiewicz, J., Stepinski, T., 2013, Geomorphons - a pattern recognition approach to classification and mapping
of landforms, Geomorphology, vol. 182, 147-156 (DOI: 10.1016/j.geomorph.2012.11.005)
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Geomorphons for North Carolina at 30ft Resolution_FGDC.xml Original FGDC Metadata
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10.68 KB
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Geomorphons_of_NC_30ft.tif
392.72 MB
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Purpose
This dataset was generated to support the North Carolina SPARROW project to help identify floodplains and stream channels throughout the state. The product classifies the ten most common geomorphic features including flat, summit, ridge, shoulder, spur, slope, hollow, footslope, valley, and depression based on a line-of-sight analysis of the elevations of the surrounding cells, in eight directions, from a central cell. For example, if the central cell has a higher elevation than all of the surrounding cells, it would be classified as a summit. The hollow, valley, and depression forms roughly map the extent of the floodplain. This information will be used to estimate watershed metrics such as floodplain area and floodplain width within North Carolina.
