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Clipping Stratigraphic Units at certain elevations

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I created a stratigraphic unit that shows everything above 240 ft msl. However, in the model there is a flat surface that represents the 240 msl cutoff. I only want to see the areas above the 240 msl mark and not the flat surface. I've tried using the isopach tool, but doesn't produce the desired results. Attached is image of the surface

Upland Unit.JPG


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Hi Josh,

You have a couple of options, depending on whether you wish to adjust the display or the grid model from which the display was generated.

Adjust the Display: In RockPlot3D, access the Elevation Grid within the Surface heading. Insert a check in the Filter box and set the minimum value to something slightly greater than 240. Click Apply and the flat areas will no longer be displayed.

Adjust the grid model: You can filter the grid model such that elevations below 240.1 (or similar) are set to null so they won't be displayed in the 3D surface or represented with contours in a 2D map. You can do this in the Utilities | Grid | Filters | Range menu option. Browse for the existing (input) RwGrd file, and type in a name for the output (filtered) RwGrd file. Insert a check in the "Low-Stop/high-Pass Filter" since you want to "stop" the low values. Set the Threshold to 240.1 (or similar) and type in "null" for the Replacement value. Choose the desired output, and that should do the trick.

Let me know if you have any questions about this.

Molly Mayfield

RockWare Inc.

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