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The expert knowledge concerning the nine vegetation classes was expressed in the following linguistic form (for the "pointwise" knowledge):
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only (top of ridges or bottom of valleys) and (altitude higher than 1850 m) |
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only (altitude from 900 to 1700m) and (plateau) |
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principally (altitude from 500 to 1000m) and (plateau) |
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only (altitude from 900 and 1800m) and (abrupt slopes near 80%) |
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principally (altitude from 1000 to 1600m) and (medium slopes or top of ridges) |
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only (altitude higher than 1800m) and (plateau) |
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only (altitude less than 300m) and (irrigable zone) |
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only (altitude less than 300m) and (near roads) |
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principally (altitude less than 300m) and (near roads) |
This knowledge introduces combination of contexts
(generally elementary contexts but sometimes not, for example "irrigable
zones") by means of "and"
or "or" operators. Moreover
uncertainty and imprecision
must be taken into account as the expert knowledge is uncertain
and imprecise.
