Convert Multiple Solid Models to High/Low/Sum/Average Grid Models

RockWorks | ModOps | Solid | Extract Grids | Solids -> Grids

Given a list of solid model names, this program will create a single output grid model for each model in which the z-values represents either:

• Grade values: Extract the highest value, lowest value, average, median, most frequently occurring, sum of corresponding values within the solid model (i.e. all nodes which fall within the same vertical region). This program allows you to view, in plan-view or 3D, a virtual summary of the underlying values.
• Elevation values: the highest elevation for the highest or lowest G value, or the lowest elevation for the highest or lowest G value. This allows you to view an elevation distribution of the model values.

This program generates the grid models only, and it assigns a name automatically. It does not offer display options, just grid model output. See the Grid | Display program to display the output grid models as a map or 3D surface.

See also
     Solid -> Grid to flatten a single solid model into single statistical grid
     Solid -> Grids to extract a series of grids from a solid model based on elevation
     Solid -> Zone Grids to extract grids based on "zones" between surfaces

Feature Level: RockWorks Basic and higher

Menu Options
Step-by-Step Summary

Menu Options

• Input/Output
  • Input
    • Input Solid Model Column: Click to the right to select the name of the column in the current datasheet where you have listed the names of the solid model file (.RwMod files) to be processed.
  • Output
    • Output Grid Model Column: Click to the right to select the name of the column in the current datasheet where the name of the output grid will be recorded. RockWorks will assign the grid name automatically, based on the name of the solid model, plus any suffix you define.
      ! Any existing data in this column will be overwritten.
    • Grid Sufix: (Optional) Enter any suffix to be added to the auto-named grid model.
      • If you leave this blank, then each output grid will have the same name as the solid model from which it was extracted. Example: The grid model extracted from "Arsenic_02-14-17.RwMod" would be automatically named "Arsenic_02-14-17.RwGrd".
      • If you enter text here, this will be appended to the model name. Example: If you enter a Suffix of "_highs", then the grid model extracted from "Arsenic_02-14-17.RwMod" would be automatically named "Arsenic_02-14-17_highs.RwGrd".
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• Type of Conversion: Click this tab to select the desired solid -> grid conversion.
  • Average G Value: Select this option to compute the average of the node G values in each vertical column of the solid model, and store that average value in the corresponding grid node.
  • Highest Elevation of Highest G Value: Select this option to determine the highest G value in each vertical column model nodes, and store the uppermost elevation for that value in the corresponding grid node.
  • Highest Elevation of Lowest G Value: Select this to determine the lowest G value in each vertical column model nodes, and store the uppermost elevation for that value in the corresponding grid node.
  • Highest G Value: Select this to create a grid model in which the highest G value in each vertical column of model nodes is stored in the corresponding grid node.
  • Lowest Elevation of Highest G Value: Select this to determine the highest G value in each vertical column model nodes, and store the lowermost elevation for that value in the corresponding grid node.
  • Lowest Elevation of Lowest G Value: Select this to determine the lowest G value in each vertical column model nodes, and store the lowermost elevation for that value in the corresponding grid node.
  • Lowest G Value: Select this option to create a grid model in which the lowest G value in each vertical column of model nodes is store in the corresponding grid node.
  • Median G Value: Choose this to compute the median node G value in each vertical column of the solid model, and store that G value in the corresponding grid node. The statistical median is the number separating the higher half of the sampling from the lower half. It is often a better representation of the "average" (versus the mean) when a distribution is skewed by outliers.
  • Most Frequently Occurring G Value: Choose this option to compute the most frequently occurring node G value (the mode) in each vertical column of the solid model, and store that G value in the corresponding grid node. Note: This doesn't work well for multimodal populations (i.e. vertical columns where there are "ties" for the most frequently occuring G values). In these cases, the program will arbritarily choose the first candidate. Also note that selecting this option will require significantly more time for performing the solid-to-grid conversion.
  • Number of Non-Null Nodes: Select this option to count the number of non-null (not equal to -1.0e27) G values in each vertical column of the solid model, and store that count in the corresponding grid node.
  • Number of Null Values: Select this to count the number of null (=-1.0e27) G values in each vertical column of the solid model, and store that count in the corresponding grid node.
  • Standard Deviation of All G Values: Select this option to compute the Standard Deviation of all the non-null nodes within each version column of the solid model, and store that count in the corresponding grid node. With some data sets, this number is an approximation of the vertical anisotropy (i.e. square root of variance).
  • Sum of all G Values: Select this option to compute the sum of the nodes in each vertical column of the solid model, and store that summed value in the corresponding grid node.
  • Weighted Arithmetic Mean: Select this option if the grid nodes are to represent a weighted arithmetic mean of the vertical column of model nodes:
    Z = Sum ( G x Voxel_Height ) / Sum ( Voxel_Height )
  • Weighted Harmonic Mean: Select this option if the grid nodes are to represent a weighted harmonic mean of the vertical column of model nodes:
    Z = Sum ( Voxel_Height ) / Sum ( Voxel_Height / G )
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Step-by-Step Summary

1. Access the RockWorks Datasheet program tab.
2. Open an existing datasheet or create a new datasheet and enter or import your solid model file names into a single column in the datasheet.
3. Select the ModOps | Solid | Extract Grids | Solids -> Grids menu option.
4. Enter the requested menu settings, described above.
5. Click the Continue button to proceed.

   RockWorks will read each input solid model file, and for each column of node values it will perform the requested data computation, storing the result as the Z value for that X,Y node location in the output grid file. This process is repeated for each column of nodes in the source file, and for each solid model file listed in the datasheet. The completed grid files will be saved with the same name as the input model, with any defined suffix.

6. Use the ModOps | Grid | Display program to view the resulting grid models as a 2D map and/or 3D surface.

See also

• Adding this program to your Playlist
• Adding this program to your Favorites
• Save/load/view menu settings
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