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Data channel
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This is the numeric on which to base the size of the plotted symbol.
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Mask channel
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The "Mask" channel records whether a row of data is selected or not. A dummy is used to indicate that the data is NOT selected, while a 1 indicates the data is selected. (In fact any non-dummy value will be interpreted as "selected").
Any channel can be used as a Mask channel, but only those channels whose CLASS is set to MASK are included in the list.
Multiple mask channels can be used to record the results of different filters or selections. The latest mask channel specified in any of the filter/selection options is used when creating plots.
Script Parameter: SEMPLOT.MASK
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Scaling
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Either Linear or Logarithmic. Linear scaling uses the data value itself in the proportional sizing formula, while Logarithmic scaling uses the log 10 value. Logarithmic scaling is recommended in cases where the data covers a large dynamic range.
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Zero base level ([log 10] data units)
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An optional Base value can be removed from the data value before the scaling is applied. (Note that for the logarithmic option the base value is a logarithmic value as well). Data with values less than the base value are assumed to have zero size, and are not plotted.
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Scale factor ([log 10] data units/mm)
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The size of symbols in mm is given by the following relation:
Size = (Data_value – Base_value) / Scale_factor
or, for log scaling:
Size = (log10(Data_value) – Base_value) / Scale_factor
Because the scale divides the data value, the smaller the scale factor is, the larger the symbols will be.
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Symbol
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A number of symbols are available. These are taken from the default Geosoft symbol font.
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Weight
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The drawing weight for the symbols. Options range from ultra-light to xx-bold.
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Line colour
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The outline colour for the symbols.
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Fill colour
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The fill colour for the symbols.
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Plot proportional symbol legend?
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If Yes, plots a proportional symbol legend.
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Current map or all maps?
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This GX operates on already-existing maps only. This controls determines whether only the current map is to be re-plotted using proportional symbols, or if all maps are to be re-plotted.
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