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University of Hannover Inst. of Physical Geography and Landscape Ecology Volume modelling of soils using GRASS GIS 3D Tools presented at Second Italian.

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Presentation on theme: "University of Hannover Inst. of Physical Geography and Landscape Ecology Volume modelling of soils using GRASS GIS 3D Tools presented at Second Italian."— Presentation transcript:

1 University of Hannover Inst. of Physical Geography and Landscape Ecology Volume modelling of soils using GRASS GIS 3D Tools presented at Second Italian GRASS Users Meeting, University of Trento, Feb Markus Neteler University of Hannover Dr. Jaro Hofierka GeoModel, Bratislava

2 University of Hannover Inst. of Physical Geography and Landscape Ecology Outline of Presentation GRASS 3D volume modeling tools Examples on soil science applications (ongoing research) Discussion

3 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools GRASS 3D Raster Data Model (G3D) Data representation: raster voxels x, y, z, w (Rase 1998)

4 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D Import 3D-ASCII sites (s.in.dbf): name|profile3d desc|RECHTS HOCH MTIEF 1:OTIEF 2:UTIEF 3:STONR 4:IL_BOD2_ID 5:SNAS 6:FEUCH 7:ST | | |%0.0 %35.0 %1.0 %22.0 %2.0 %5.0 %1.0 % | | |%36.0 %45.0 %1.0 %22.0 %2.0 %5.0 % | | |%46.0 %110.0 %1.0 %22.0 %2.0 %5.0 % | | |%111.0 %120.0 %1.0 %22.0 %2.0 %5.0 % | | |%0.0 %30.0 %10.0 %48.0 %0.0 %5.0 % | | |%31.0 %40.0 %10.0 %14.0 %0.0 %5.0 % | | |%31.0 %40.0 %10.0 %26.0 %0.0 %5.0 % | | |%31.0 %40.0 %10.0 %43.0 %0.0 %5.0 %9.0 s.vol.idw Interpolation s.vol.rst s.to.rast3 Conversion

5 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data interpolation s.vol.idw Inverse Distance Weighted interpolation s.vol.rst Regularized Splines with Tension (Mitasova et. al)  tension parameter  gradient calculation

6 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data tools for manipulation and exploration s.vol.rst (Mitasova et al.)  3D interpolation from sites  Gradient calculation  Horizontal and vertical aspects

7 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data tools for manipulation and exploration r3.mapcalc (Paudits & Hofierka)  Grid volume data calculator  Operators comparing to 2D r.mapcalc  3D neighbourhood modifier: map[r,c,d] r3.mapcalc test="if((ph_rst > 6.8) && (ph_rst < 7.1), ph_rst, null())" pH value

8 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data export and visualization Export to 3D sites: r3.to.sites/NVIZ

9 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data visualization r3.mkdspf/ r3.showdspf - openGL viewer

10 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data visualization Vis5D viewer  isolines and isosurfaces  rotate, zoom  clipping planes  slices

11 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D data visualization r3.to.v5d Vis5D viewer  volume visualization  3D data query with cursor

12 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D Examples Study area: 3x3 km 2 south of Hannover, 2m soil depth max.

13 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools 3D Soil Data RECHTSEast HOCH North MTIEFavr. depth for horizont ILDE_IDID STONR int. profile number NRprofile number OTIEFupper horizont boundary UTIEF lower horizont boundary GWS influence of g.water (class) SNAS damming wetness (class) FEUCH soil moisture (class) LGDI soil compactness STEINE stones contents ORGSUB organic matter contents KALK limestone contents (class) GWTIEFE depth to groundwater table FSAND fine sand fraction MSAND medium sand fraction GSAND coarse sand fractio nFSCHLUFF fine silt fraction MSCHLUFFmedium silt fraction GSCHLUFF coarse silt fraction TON clay fraction PHWERTpH-value KFWERT permability coefficient NGESAMT nitrate contents KAKPOT pot. cation exchange capacity SWERT sum of basic interacting cations VWERT base saturation PHOS phosphor contents BOTYP soil type (German taxonomy) KULTUR landuse MGW avr. depth to groundwater table GRUN rootable depth HORIZletter suffixes of master horizons FARBE soil color HNBOD soil texture WURZELNrooting activity SKELETT skeletal elements contents LDSVeffective compactness

14 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools Demonstration of Vis5D

15 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools Conclusion Technical view  Technology which performs on common PC  However limitations due to data intensity  Still inconsistencies to fix in 2D/3D GRASS

16 University of Hannover Inst. of Physical Geography and Landscape Ecology GRASS 3D volume modeling tools Conclusion Scientific view  Problem of 3D data availability  Note: Interpolations don't represent natural phenomena  Problem of 3D modelling within boundaries (soil units)  Time representation incomplete


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