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CHARACTERISTICS OF A MAP |
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SOIL MAP QUALITY
When evaluating the quality of a soil map, it is assumed that the edaphologist knows his speciality and is sufficiently experienced. The following aspects are therefore generally assumed to be correct:
the density of observations (this should be indicated in the map report)
the decisions taken at each point.
Quality control measures relating to the description of soils can be grouped as follows:
occasional controls:
comparative trials to compare the work of different prospectors.
controls comparing field descriptions and laboratory analyses
systematic controls:
validity controls: monitoring the norms governing description.
coherence controls: coherence and compatibility between the data corresponding to the same soil.
probability controls: carrying out evaluations to check whether the data obtained have acceptable values, taking into account general knowledge of the area.
The reliability of a map refers to the confidence with which it can be used to predict soil properties and behaviour at a determined point.
Reliability depends on:
the scope with which the map unit has been defined.
the purity of the map unit
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