S-map's primary map layer is soil classes, i.e. delineated areas that are labelled with the soil family name. Each soil family is defined as a unique combination of attributes (NZSC classification, parent material, rock type, dominant texture and permeability class). Soil classes are further characterised as siblings according to their depth to rock class, stoniness, land type, drainage, texture (more detailed), functional horizons and miscellaneous variant information. This layer is a "dissolved" representation of the soil depth attribute for S-map soils. Soil depth (Webb & Lilburne 2011) is defined according to a traditional agronomic concept of soil depth (Taylor & Pohlen 1970). In a practical sense, it can be thought of as the depth to a layer that makes augering or digging difficult. Soil depth is identified as the depth to:· A very stony horizon (more than 35% stones by volume)· A soft or hard rock surface· Shattered rock· A pan, as defined in Hewitt (2010)· Firm consistence, together with massive or gross structure. Note that while the layer defining soil depth may cause some restriction in root penetration, it does not necessarily define the base of the potential rooting depth.The dominant depth class is defined as:d Deepmd Moderately Deeps Shallowvs Very Shallow
S-map builds on previous soil mapping by filling gaps with new mapping, and upgrading the information content and associated database to meet a new national standard.
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