Plot Proportional Size Symbols

Use the Map Tools > Symbols > Proportional Size menu option (PROPSYMB GX) to place proportionally scaled symbols on your map. Symbol plotting parameters include the following:

• Data channel used for scaling symbols
• Zero base level (data units)
• Scale factor (data units/mm)
• Symbol
• Weight
• Line colour
• Fill colour

The option  is also available with the following extensions:

• Geochemistry extension: Geochem Map > Point Plots menu (CHPROPSYMB GX).
• Grav/Mag Interpretation extension: Euler 3D > Plot Solution Symbols menu (PROPSYMB GX).

To plot proportional size symbols on a map:

1. Select /open the map with which you want to work.

2. Select the Map Tools> Symbols > Proportional Size menu option or run the PROPSYMB GX. The system displays the Proportional Size dialog box.

3. Specify the data and mask channels you wish to process.

   If you specify a base value, the value is subtracted from the data before calculating the symbol sizes. Negative values after subtracting the base are not plotted.

4. If you wish to edit the look of your symbols, click the Symbol button and the Symbol Attributes dialog is displayed.

5. Specify the sizing and colour symbol plotting parameters and close the dialogs.

6. Oasis montaj displays the symbols on your map.

Proportional Size dialog options

Data channel	Select the channel to plot from current database. The sizes of the plotted symbols are scaled according to the data values in this channel. The symbol size in mm is given by the following relationship: Size (mm) = (Value – base) / Scale; Script Parameter: PROPSYMB.CHANNEL
Zero base level (data units)	Zero base level (data units). This value is subtracted from the data value in the size channel, before the scaling factor is applied. Values less than or equal to the base level are not plotted. Script Parameter: PROPSYMB.BASE
Scale factor (data units/mm)	Symbol scale size units/mm. Script Parameter: PROPSYMB.SCALE
Mask channel	Select a mask channel from the dropdown list. If the use of the mask channel is enabled, and set to this channel, only those data values whose corresponding mask channel value is not a dummy will be plotted or exported. Channels must have their CLASS attribute set to MASK to appear as selections in the drop-down list. If the mask channel does not exist, it will be created with its CLASS attribute set to MASK. Script Parameter: PROPSYMB.MASK
Symbol	Select the symbol to use with Symbol Form GUI. Script Parameters: PROPSYMB.SYMBOL: Font face name, e.g. "symbols.gfn" PROPSYMB.GEOFONT: 1 if a Geosoft font, O for TrueType (TT) PROPSYMB.SYMBOL: Symbol number. PROPSYMB.WEIGHT: Symbol weight PROPSYMB.LINE_COLOR: Symbol edge colour PROPSYMB.FILL_COLOR: Symbol fill colour PROPSYMB.ANGLE: Symbol angle

Application Notes

Use the PROPSYMBLEG GX to plot a proportional symbol legend.

Plotted data is masked to the current data view’s clip region. Data outside the clip region is still written to the map, but is not visible. To see this data, uncheck the "Masked to view" box in the Map Manager tool.