Removing Closed Depressions from a Grid Model

RockWorks | ModOps | Grid | Filters | Fill Sinks

This program is used to removed closed depressions from a grid model. There are several applications for this utility:

• Eliminating closed depressions from a grid model prior to creating a simulated drainage net (see above graphic).
• Cleaning up an "oversampled" grid model or other types of models that may have depressions caused by either the sampling method (e.g. LIDAR) or the gridding algorithm (e.g. inverse-distance).
• Creating a model that can be subtracted from the original model in order to identify and estimate the volumes of depressions (e.g. sinkholes, excavations, subsidence, etc.).

! This program requires that the RockWorks grid model (.RwGrd file) to be filtered already exists in your project folder.

Menu Options
Step-by-Step Summary

Menu Options

• Grid Names
  • Input Grid (with sinks): Click to the right to browse for the name of the grid model (".RwGrd" file) to be filtered.
  • Output Grid (no sinks): Click to the right to type in a name for the new grid file that will be created.
  
  
• 2D Grid Map
  Check this box to display the output grid as a 2D map at this time.
  Click this tab to set up the 2D map layers (bitmap, symbols, labels, line contours, color-filled contours, labeled cells, map border, etc.).


• 3D Grid Diagram
  Check this box to display the output grid as a 3D surface at this time.
  Click this tab to set up the 3D map layers (surface colors, images, reference cage, etc.).
  ! You can request both a 2D and 3D representation of the grid model.

Step-by-Step Summary

1. Be sure you have a real number RockWorks grid model (.RwGrd file) already created, for input into this program.
2. Select the ModOps | Grid | Filters | Fill Sinks menu option.
3. Enter the requested menu settings, described above.
4. Click the Process button to continue.

The program will load the input grid model. For each grid node, the program follows a course downgradient until it can't go any further. If the final node is not on the edge of the grid (thus it's a sink), the program will raise that grid node to a level equal to the next highest neighboring grid node. The process is repeated until there are no more sinks. The final model is stored under the output grid model name.

! The time required to fill the sinks with a grid model may range from seconds (for a 20x20 grid model) to hours (for a 250x250 grid model).

The requested diagram(s) will be displayed in a RockPlot2D tab and/or RockPlot3D tab in the Options window.

5. You can adjust any of the settings in the Options window and then click the Process button again to regenerate the diagram(s).
6. View / save / manipulate / export / print the diagram in the RockPlot2D or RockPlot3D window.

See also

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

Back to Grid Menu Summary

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