[GRASS-user] 3D unstructured Grid

Vaclav Petras wenzeslaus at gmail.com
Thu Oct 4 19:57:35 PDT 2018

On Tue, Oct 2, 2018 at 9:38 PM Francois Chartier <fra.chartier at gmail.com>

> For example, in the example on the webpage, there is a 3D raster for soil
> moisture; if the soil moisture is measured only for the top of a cylinder
> along your vertical hole, the next moisture measurement is taken at a lower
> depth, and the intervals (cylinder length) are not the same along that
> vertical axis?

Yes, all are (can be) different. The values are interpolated in between.
The input are arbitrary places points. The output is a regular grid. Note,
you may need to explore zscale parameter of v.vol.rst because of the how
your data looks like.

> Le lun. 1 oct. 2018 à 22:01, Vaclav Petras <wenzeslaus at gmail.com> a
> écrit :
>> On Sat, Sep 29, 2018 at 4:45 PM Francois Chartier <fra.chartier at gmail.com>
>> wrote:
>>> Can Grass GIS create a 3D unstructured grid based on a 3D point data set
>>> ?
>> All data and visualizations at the following website were created in
>> GRASS GIS including a 3D regular grid (3D raster in GRASS GIS) interpolated
>> from a set of 3D points (vector which is 3D, i.e. with z, in GRASS GIS).
>> Points were soil properties measurement at different depths, 3D raster is
>> then continuous representation of a selected property.
>> https://geospatial.ncsu.edu/geoforall/multidim-geovis.html
>> Module used for interpolation was v.vol.rst:
>> https://grass.osgeo.org/grass74/manuals/v.vol.rst.html
>> Vaclav
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