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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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