Environmental variables (EV) | ||
Environmental variable | Abbreviation | Proxy for |
Digital elevation model | DEM | Temperature, topographic variation |
Slope | Slope | Soil moisture, soil nutrients, soil characteristics |
Aspect | Aspect | Slope direction, sun exposure |
Solar radiation | Solar_rad | Insolation |
Curvature | Curvature | Exposure to wind, water and soil nutrient runoff direction |
Relative relief 3 × 3 | Rel_3 | Large scale topographic differences, 30 × 30 meters |
Relative relief 6 × 6 | Rel_6 | Large scale topographic differences, 60 × 60 meters |
Relative relief 9 × 9 | Rel_9 | Large scale topographic differences, 90 × 90 meters |
Wetness index | Wet_ind | Groundwater |
Profile curvature | Prof_curv | Affects the acceleration or deceleration of flow across the surface |
Planform curvature | Plan_curv | Relates to the convergence and divergence of flow across a surface |