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Landform classes defined by topographic indices and slope (Weiss 2001).
| Landform Class | TPI500 | TPI2000 | Slope |
|---|---|---|---|
| deep streams | ≤-1 | ≤-1 | |
| shallow valleys and mid-slope drainage pathways | ≤-1 | >-1 and <1 | |
| upland drainage are | ≤-1 | ≥1 | |
| U-shaped valleys | >-1 and <1 | ≤-1 | |
| plains | >-1 and <1 | >-1 and <1 | ≤5° |
| open slopes | >-1 and <1 | >-1 and <1 | >5° |
| upper slopes and mesas | >-1 and <1 | ≥1 | |
| local ridges and hills in large valleys | ≥1 | ≤-1 | |
| mid-slope of ridges and small hills in plains | ≥1 | >-1 and <1 | |
| high ridges | ≥1 | ≥1 | |
