Linked from
The 7 pages that link to Soil survey, each with the reason it gives.
Soil horizonRelated: Surveyors record horizon sequences to map soil properties and boundaries.
Soil profileRelated: Profile observations support the characterization and mapping of soil units.
Soil scienceRelated: Surveys turn soil observations into maps used for land decisions.
Soil typeRelated: Surveys identify where soil types occur and how they should be managed.