r3.cross.rastgrass - Online in the Cloud

PROGRAM:

NAME

r3.cross.rast - Creates cross section 2D raster map from 3D raster map based on 2D
elevation map

KEYWORDS

raster3d, profile, raster, voxel

SYNOPSIS

r3.cross.rast
r3.cross.rast --help
r3.cross.rast [-m] input=string elevation=string output=string [--overwrite] [--help]
[--verbose] [--quiet] [--ui]

Flags:
-m
Use 3D raster mask (if exists) with input map

--overwrite
Allow output files to overwrite existing files

--help
Print usage summary

--verbose
Verbose module output

--quiet
Quiet module output

--ui
Force launching GUI dialog

Parameters:
input=string [required]
Input 3D raster map for cross section

elevation=string [required]
2D elevation map used to create the cross section map

output=string [required]
Resulting cross section 2D raster map

DESCRIPTION

This module creates a cross section 2D map from one 3D raster volume map based on a 2D
elevation map. It checks if the value of the elevation map is located in the z-coordinate
space of the 3D map. If so, the 3D voxel value for this position is transferred to the
related cross section output map cell, otherwise the NULL value is set.

How r3.cross.rast works

If the 2D and 3D region settings are different, the 2D resolution will be adjust to the 3D
resolution.

NOTES

To create a cut plane elevation map use r.mapcalc. Some examples:

· To create a cut plane elevation map in x direction type
r.mapcalc "cutplane = col()*x",
x be the value for the elevation. If the range of col() is 1 ... 10, the elevation
map has the range 1 ... 10 if x == 1 and if x == 10 the range 10 ... 100

· To create a cut plane elevation map in y direction type
r.mapcalc "cutplane = row()*x",
x be the value for the elevation. If the range of col() is 1 ... 10, the elevation
map has the range 1 ... 10 if x == 1 and if x == 10 the range 10 ... 100

· The user can also make a cut in y and x direction with r.mapcalc by using
r.mapcalc "cutplane = (row()+col())*x"

EXAMPLE

Simple Spearfish example
g.region -d
g.region res=150 res3=150 t=1000 b=0 tbres=100
# synthetic data, could be geological structures:
r3.mapcalc "map3d = sin(row())+sin(col())+sin(depth()*depth())"
#create a cutplane map
r.mapcalc "cutplane = col()*10"
#create the cross section map
r3.cross.rast input=map3d elevation=cutplane output=crosssection

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