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A check file is a map showing two pieces of information:
the specific instance/occurrence /exclusion of the soil type that determines the final fuzzy membership at a location; and
the rule in the determining instance/occurrence/exclusion that determines the final fuzzy membership at a location.
A check file is a .3dr file and is named by adding "chk" at the end of the output file name for the soil type.
Each value in a check map has two parts: the integer part and the decimal part. The integer part is the ID of instance/occurrence/ exclusion, which indicates the determining instance/occurrence/exclusion at that location. The ID corresponds to the order of the instance/occurrence /exclusion in the soil type (1 for instance, 2 for occurrence, 3 for exclusion). If none of the existing instances, occurrences and exclusions has effect at a location, the integer part of the check file value at that location will be -1.
The decimal part is the determining rule's ID, which indicates the determining environmental variable at that location.
For example, suppose that a pixel in the check file has an output of 103.04. This value can be interpreted as follow:The integer part of the check file in this example is 103. "1" indicates that it is the instance that determines the final fuzzy membership. "03" indicates that for this location the third instance in the soil type is the determining instance. The decimal part of the check file in this example is "04", which means the fourth environmental feature is the determining environmental feature at this location.
Similarly, "205.03" means the 3rd rule of the 5 the occurrence is the determining rule. "301.05" means the 5th rule of the 1st exclusion is the determining rule.
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