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Unformatted text preview: o y if both 4 and 5 are y o n otherwise overlay layers 7 and 8 to obtain layer 9, coding as follows o y if both 7 and 8 are y o n otherwise Result the loggable cells are y on layer 9 Operations used o recode o overlay o spread we could have achieved the same result using the operations in other sequences, or by combining recode and overlay operations o e.g. overlay layers 2 and 3, coding as follows y if layer 2 is 2 and layer 3 is 2, n otherwise this would replace two recodes and an overlay o e.g. some systems allow layers to be overlaid 3 or more at a time the names given to operations vary from system to system, but most of the operations themselves are common across systems...
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- Fall '08