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Custom Soil Resource Report <br /> Map unit symbol Map unit name Rating Acres in AOI Percent of AOI <br /> 69 Valent sand,0 to 3 Farmland of local 13.0 0.9% <br /> percent slopes importance <br /> 72 Vona loamy sand,0 to 3 Farmland of local 1.0 0.1% <br /> percent slopes importance <br /> 85 Water Not prime farmland 99.8 7.1% <br /> Totals for Area of Interest 1,397.0 100.0% <br /> Rating Options—Farmland Classification (Two Rivers Ranch <br /> Area Soils) <br /> Aggregation Method: No Aggregation Necessary <br /> Aggregation is the process by which a set of component attribute values is reduced <br /> to a single value that represents the map unit as a whole. <br /> A map unit is typically composed of one or more "components". A component is <br /> either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute <br /> being aggregated, the first step of the aggregation process is to derive one attribute <br /> value for each of a map unit's components. From this set of component attributes, <br /> the next step of the aggregation process derives a single value that represents the <br /> map unit as a whole. Once a single value for each map unit is derived, a thematic <br /> map for soil map units can be rendered. Aggregation must be done because, on <br /> any soil map, map units are delineated but components are not. <br /> For each of a map unit's components, a corresponding percent composition is <br /> recorded. A percent composition of 60 indicates that the corresponding component <br /> typically makes up approximately 60% of the map unit. Percent composition is a <br /> critical factor in some, but not all, aggregation methods. <br /> The majority of soil attributes are associated with a component of a map unit, and <br /> such an attribute has to be aggregated to the map unit level before a thematic map <br /> can be rendered. Map units, however, also have their own attributes. An attribute of <br /> a map unit does not have to be aggregated in order to render a corresponding <br /> thematic map. Therefore, the "aggregation method"for any attribute of a map unit is <br /> referred to as "No Aggregation Necessary". <br /> Tie-break Rule: Lower <br /> The tie-break rule indicates which value should be selected from a set of multiple <br /> candidate values, or which value should be selected in the event of a percent <br /> composition tie. <br /> 48 <br />