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Tim Rocks

grid from g value

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Hi,

I have creating a solid model using geochemistry data. Is there a way to extract and create a grid file from a specific g value concentration?

Or is there a way to interpolate my dataset to produce a grid file (surface) of the g value i require?

Thanks

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Hi Tim,

The RockWorks 15 Utilities Solid -> Grid command has the option to extract a grid file with the highest or lowest elevation for the minimum or maximum concentration value for the vertical column of cells at each (x,y) location. To extract the elevation for a specified concentration value that is not the minimum or maximum, filter the concentration model file to contain only the value of interest.

  • Choose the Utilities Solid | Filter | Range Filter menu command.
    • Specify the input solid model file and new output solid model file name.
    • Under Filters, add a check mark to the High-Stop/Low-Pass option.
      • Set the Threshold to the value you wish to extract.
      • Set the Replacement to the same value. This will replace any values higher than the value of interest with the cutoff value.
    • Add a check mark to the Low-Stop/High-Pass option.
      • Set the Threshold to a slightly smaller value than the High-Stop/Low-Pass Threshold. For example, I set the High-Stop/Low-Pass Threshold to 75, and the Low-Stop/High-Pass Threshold to 74.99.
      • Set the Replacement to NULL or -1e27.
    • ‚ÄčThis will create a solid model containing only the specified value, e.g. 75.
  • Choose the Solid | Convert | Solid -> Grid menu command to extract a grid file.
    • Specify the solid model file created in the previous step.
    • Specify the output grid file name for the upper surface.
    • Select the option Z = Highest Elevation of Highest G-Value.
  • Repeat the Solid | Convert | Solid -> Grid command.
    • Specify the same solid model file as in the previous step.
    • Specify the output grid file name for the lower surface.
    • Select the option Z = Lowest Elevation of Highest G-Value.

‚ÄčThe result is two grid files representing the upper and lower surface of the ore body.

Thanks,

Tom B

RockWare Inc

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hey thanks Tom,

that is a useful function. unfortunately, i after trying this out it doesn't produce the desired surface (no fault of rockworks).

in this case the high concentrations are above and below a low concentration area. the situation is an mineral ore body bound by higher concentrations of silica above and below it.

is there any way to create a grid from the higher concentrations that form the lower and higher bounding units? i am particular interesting in creating a surface that is the lower boudary mineralisation.

Regards,

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Hi Tim,

You may be able to create separate models with just the upper or lower zones if they can be segregated by a constant Z elevation. Change the Project Dimensions to change the Z extents.

If this method does not resolve the problem, you are welcome to upload a ZIP file with your MOD file to http://rockware.com/upload and I will take a look.

Thanks,

Tom B

RockWare Inc

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