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Table 1 Slope position classes defined by Weiss, 2001.

From: Identifying malaria vector breeding habitats with remote sensing data and terrain-based landscape indices in Zambia

Slope Position Class TPI Slope
valley <-1 SD  
lower slope ≥-1 SD and <-0.5 SD  
flat slope ≥-0.5 SD and ≤0.5 SD ≤5°
middle slope >-0.5 SD and <0.5 SD >5°
upper slope >0.5 SD and ≤1 SD  
ridge >1 SD  
  1. SD = standard deviation, (>) = above mean, (<) = below mean