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NAME

r.to.rast3elev - Creates a 3D volume map based on 2D elevation and value raster maps.

KEYWORDS

raster, raster3d, voxel, conversion

SYNOPSIS

r.to.rast3elev
r.to.rast3elev help
r.to.rast3elev [-ulm] input=name[,name,...] elevation=name[,name,...] output=name [upper=float] [lower=float] [--overwrite] [--verbose] [--quiet]

Flags:

-u
Use the input map values to fill the upper cells
-l
Use the input map values to fill the lower cells
-m
Use 3D raster mask (if exists) with input map
--overwrite
Allow output files to overwrite existing files
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

input=name[,name,...]
Name of input raster map(s)
elevation=name[,name,...]
Name of elevation raster map(s)
output=name
Name for output raster3d map
upper=float
The value to fill the upper cells, default is null
lower=float
The value to fill the lower cells, default is null

DESCRIPTION

Creates a 3D volume map based on 2D elevation and value raster maps. If the 2d and 3d region settings are different, the 2d resolution will be adjust to the 3d resolution.

How r.to.rast3elev works

NOTES

The hight of the 2D elevation maps will be used to verify the position within the 3D region. If the cell value of the elevation raster maps is located within the 3d region, the cell value of the appropriate 2D input raster maps will be written to the associated 3d cell. There are flags and options to fill the upper and lower 3D cells with a specific value, or the input raster maps values.

Example

Simple Spearfish example 
g.region rast=elevation.10m
g.region res=200 res3=200 t=2000 b=0 tbres=20

# Write the values of raster map soils based on the elevation of elevation.10m
# to the 3D map volev

r.to.rast3elev --o in=soils elev=elevation.10m out=volev

# Write the values of map soils based on the elevation of elevation.10m
# to the 3D map volev_l and fill the lower cells with the soils map values

r.to.rast3elev --o in=soils elev=elevation.10m out=volev_l -l

# Write the values of map soils based on the elevation of elevation.10m
# to the 3D map volev_u and fill the upper cells with the soils map values

r.to.rast3elev --o in=soils elev=elevation.10m out=volev_u -u

# Example with multiple elevation maps.
## first we need three support maps

r.mapcalc --o expression="one = 1" 
r.mapcalc --o expression="two = 2" 
r.mapcalc --o expression="three = 3" 

## Now we generate the new evelation maps

r.mapcalc --o expression="elev_mid = elevation.10m - 500"
r.mapcalc --o expression="elev_bottom = elevation.10m - 1000"

## Now fill the lower cells below the elevation maps with the values one, two and three

r.to.rast3elev --o -l input=one,two,three elevation=elevation.10m,elev_mid,elev_bottom output=threelayer

## Export the map for visualization with paraview (http://www.paraview.org)
## By default the null value is -9999.99, we adjust it to 0.0 for 
## better visualization 
r3.out.vtk --o null=0.0 input=threelayer output=/tmp/threelayer.vtk

# Start paraview 

paraview --data=/tmp/threelayer.vtk

# First you need to choose the surface representation style and then color by "threelayer" in paraview .

SEE ALSO

r.to.rast3
r3.cross.rast
g.region

AUTHOR

Soeren Gebbert

Last changed: $Date: 2013-03-26 14:18:08 -0700 (Tue, 26 Mar 2013) $

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