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10.3 LandformRelief/modal slopeRelief and modal slope will be interpreted for land-unit tracts above and including the level of land system.Relief and modal slope classes will also be generated according to Table 5 of Speight (2009). The <strong>ASRIS</strong> teamwill calculate these values where absent using the continental digital elevation model. It is acknowledgedthat slopes will be underestimated in some landscapes as a result. Codes are provided in Table 10.Table 10: Relief and modal slope classesCodeB Badlands 32%Code descriptionB1 Badlands 9–30 m >56%B2 Badlands 30–90 m >100%GP Gently undulating plains 100%RH Rolling hills 90–300 m 10–32%RL Rolling low hills 30–90 m 10–32%RM Rolling mountains >300 m 10–32%RP Rolling plains 300 m 32–56%SR Steep rises 9–30 m 32–56%UH Undulating hills 90–300 m 3–10%UL Undulating low hills 30–90 m 3–10%UP Undulating plains 300 m 56–100%Landform patternLandform pattern is recorded using the glossary provided by Speight (2009, p58–72).27
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