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Table 1 Grading rules of single factors for land suitability

From: Determination of production regions for pollution-free Chinese medicinal materials by geographic information system: Achyranthes bidentata (Niu Qi) in Tianjin as an example

Level Rating score
Assessment factors 10 8 6 4 2
Distance from road (m) > 3000 3000–2000 2000–1000 1000–500 < 500
Distance from residential area (m) > 5000 5000–3000 3000–2000 2000–1000 < 1000
Land slope (°) 0–5 5–10 10–15 15–20 > 20
Land usage status Tidal flats and wasteland Meadow Cultivated land Waters and residents not considered