Hi, I'm not following this discussion fully, but don't you need just r.to.rast3elev followed by some raster algebra with ifs (r3.mapcalc)?
https://grass.osgeo.org/grass74/manuals/r.to.rast3elev.html https://grass.osgeo.org/grass74/manuals/r3.mapcalc.html Best, Vaclav On Thu, Jun 28, 2018 at 12:18 PM, Francois Chartier <[email protected]> wrote: > Is it possible to define a horizontal constraints so that more weight is > given on the interpolation of the property horizontally rather than > vertically. > Similarly in kriging we can define a semi variogram with an orientation in > 2d, and i would like to know if it can be done in 3d. > Also what about the question regarding the elevations between the top and > bottom of the soil formation. Is there a possibilty for v vol rst to > consider data points in between top and bottom. > > On Jun 28, 2018 03:40, "Moritz Lennert" <[email protected]> > wrote: > > On 27/06/18 16:32, Francois Chartier wrote: > > So therefore, my approach of generating a soil property at each > > elevation and interpolating is a correct approach. > > Is there a way that i can constrain the interpolation horizontally. > > Not sure what you mean by constraining the interpolation horizontally. > > You can create a 2D elevation map by interpolating all your height > information of layer 1 (for example using v.surf.rst). Then you create a > second elevation map interpolating the layer 2 height information, etc. > > Moritz > > > > > I. > > Cant remember the module name i am using but i am generating the 3d > > raster from the 3d data points directly. > > > > > > On Tue, Jun 26, 2018, 23:38 Moritz Lennert, > > <[email protected] <mailto:[email protected]>> > wrote: > > > > On 27/06/18 03:59, Francois Chartier wrote: > > > 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 <http://r3.in.xyz> > > <http://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. > > > > > > > I don't think r3.in.xyz <http://r3.in.xyz> is what you need. This > > > module aggregates 3D > > point data into voxels. > > > > You probably want to use something like r.to.rast3. This would mean > > interpolating each layer separately into 2D elevation maps and then > > assemble them into 3D using r.to.rast3. > > > > Moritz > > > > > > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user >
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