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3. Preserve mode uses simple 3-D nearest neighbour
interpolation to define new density values of the blocks
when the model is resized, re-discretised, or repositioned.
For example, if the position of the main block is shifted,
the anomalous target remains more or less at the same
geographic position, but its relative position (indexing)
inside the main block will change. Note that 3-D
interpolation of densely discretised and large models can
be very time-consuming.
The following text fields define the position, size and
discretization of the main block:
1.
X position (easting) of the SW corner of the main block
2.
Y position (northing) of the SW corner of the block
3.
Z position (depth to the top) of the main block
4.
X size of the main block (in EW direction)
5.
Y size of the main block (in NS direction)
6.
Z size or height of the main block (downwards)
7.
X discretization (number of blocks) in EW-direction
8.
Y discretization (number of blocks) in NS-direction
9.
Z discretization (number of blocks) in vertical direction.
In GRABLOX2 the true dimensions (distances) of the block
model (and computation grid) are defined using the
Gravity/Scale unit
menu
item.
The
given
rectangular
coordinates do not need to be actual geographic map coordinates. To be able to better model
geological strike directions, for example, the data and the model should be defined using
rotated coordinates.
The next two text fields define two density parameters:
1.
Bg dens defines the user defined background density value, 0 (g/cm3)
2.
Param defines the default density value used to reset the model into, 1 (g/cm3).
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