Feature Stripping
Description
Layer
Position
Attribute
Random
Description
The feature stripping panel is part of the feature
properties dialog box. It is used to define how features will be
stripped.
Stripping is the process of selectively removing parts of a feature based on a
set of criteria. The stripping only applies to whole cells in the features.
Parts of cells are not removed.
A cell is a discrete part of a feature's geometry, such as a fracture in a fracture set or an element in a
grid.
Stripping can be by layer, position, attribute, random
or any combination of methods.
Layer
The Layer sub-panel defines stripping by layer. This is only available
for layered models, such as structured grids. Ticking the Layer check
box enables stripping by layer.
- I, J, K, Min., Max. limits
- These limits define the minimum and maximum I, J, K layer values for
stripping. The I, J and K values are the layer numbers, starting at zero, in
each direction. Usually, the I direction corresponds to the X axis, J to the Y
axis and K to the Z axis of the features.
- Strip outside bounds
- If this option is selected then any cells of a feature not within the
specified I, J and K limits are removed.
- Strip inside bounds
- If this option is selected then any cells of a feature within the
specified I, J and K limits are removed.
- Strip undefined values
- If this checkbox is ticked then any cells of a feature that do not have a
layer value defined are removed.
- Recalculate
- Clicking this button restores the I, J and K limits to the minimum and
maximum values for the current features.
Position
The Position sub-panel defines stripping by position. Ticking the Position check
box enables stripping by position.
- X, Y, Z, Min., Max. limits
- These limits define the minimum and maximum X, Y, Z coordinate values for
stripping.
- Strip outside bounds
- If this option is selected then any cells of a feature that have all
their coordinates outside the specified X, Y and Z limits are removed.
- Strip inside bounds
- If this option is selected then any cells of a feature that have all
their coordinates inside the specified X, Y and Z limits are removed.
- Recalculate
- Clicking this button restores the X, Y and Z coordinate limits to the minimum and
maximum values for the current features.
Attribute
The Attribute sub-panel defines stripping by attribute. Ticking the Attribute check
box enables stripping by attribute.
Attribute stripping is done on a per cell basis. If attributes are defined at
points rather than for cells, then all the point values must satisfy the
stripping criteria to be stripped.
The attribute to strip by and the units to use can be selected from the
drop-down lists.
- Min.
- Specifies the minimum value of the attribute in the selected units.
- Max.
- Specifies the maximum value of the attribute in the selected units.
- Strip outside range
- If this option is selected then any cells of of a feature that have
attribute values outside the specified range are removed.
- Strip inside range
- If this option is selected then any cells of a feature that have
attribute values inside the specified range are removed.
- Strip undefined values
- If this checkbox is ticked then any cells of a feature that do not have a
value defined for the specified attribute are removed.
- Recalculate
- Clicking this button restores the attribute range to the minimum and
maximum values for the current features.
Random
The Random sub-panel defines random stripping. Ticking the Random check
box enables random stripping.
For each cell in a selected feature there is a specified percentage chance that the
cell will be removed.
- Percentage
- The percentage of each feature to randomly remove, in the range 0% to 100%,
can be specified using the slider or by entering the percentage directly into
the text box.
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