Partial dependence plots showing the effect of various environmental factors on the distribution of vegetation units. (a) MAP influencing the distribution of unit 7, the Thornbush savanna – Nama-Karoo transition; (b) MAP influencing the distribution of unit 8, the Aristida congesta-Senegalia mellifera thornbush savanna; (c) MAP influencing the distribution of unit 9, the Senegalia mellifera-Dichrostachys cinerea degraded thornbush savanna; (d) MAP influencing the distribution of unit 10, the Schmidtia kalahariensis-Rhigozum trichotomum arid thornbush savanna.