[GRASS-user] r3.in.xyz

[Francois Chartier]

Hi,

I am working with a data set that consists of borehole logs with a Top of a
layer (layer 1) and the top of the underlying layer (layer 2) (which is
also the bottom of the overlying layer 1).  Everything in between the
elevation of top of layer 1 and top of layer 2 correspond to a Layer 1
property.

The thickness of Layer 1 varies and this layer may not exist everywhere
(pinches out).  Above the Layer the property is different; in other words
the property only starts below the Top of layer 1 until the underlying Top
of the next layer.
Not sure of the capabilities of the interpolation in Grass and working with
a very large data set (i cannot link every top of layers together), my
first approach was to create a each Layer property for every elevation
slice along each Borehole axis, interpolating soil properties at every
elevation between Boreholes.

I read on another forum that r3.in.xyz can interpolate in 3D without a
Property at every elevation slice,

   - while respecting the condition that above the Top of the layer 2, the
   property corresponds to the Overlying top layer 1, and
   - that the property is continuous until the next underlying layer 3 -
   can someone confirm this?

To provide a bit of background, borehole data bases, identify the top of
layer as encountered when drilling downwards, and provide the elevation of
the next layer (pick); in between the soil property is the same, however
there is no data points.  When interpolating, while there is no data point
in between the two geological picks, the property should still have weight
in the interpolation process.

Thank You
Francois
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