.TH r3.gradient 1grass "" "GRASS 7.8.5" "GRASS GIS User's Manual"
.SH NAME
\fI\fBr3.gradient\fR\fR  \- Computes gradient of a 3D raster map and outputs gradient components as three 3D raster maps.
.SH KEYWORDS
raster3d, gradient, voxel
.SH SYNOPSIS
\fBr3.gradient\fR
.br
\fBr3.gradient \-\-help\fR
.br
\fBr3.gradient\fR \fBinput\fR=\fIname\fR \fBoutput\fR=\fIgrad_x,grad_y,grad_z\fR[,\fIgrad_x,grad_y,grad_z\fR,...]  [\fBblocksize\fR=\fIsize_x,size_y,size_z\fR[,\fIsize_x,size_y,size_z\fR,...]]   [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of input 3D raster map
.IP "\fBoutput\fR=\fIgrad_x,grad_y,grad_z[,\fIgrad_x,grad_y,grad_z\fR,...]\fR \fB[required]\fR" 4m
.br
Name for output 3D raster map(s)
.IP "\fBblocksize\fR=\fIsize_x,size_y,size_z[,\fIsize_x,size_y,size_z\fR,...]\fR" 4m
.br
Size of blocks
.br
Default: \fI30,30,20\fR
.SH DESCRIPTION
Module \fIr3.gradient\fR computes gradient from a 3D raster map.
Results are three 3D raster maps describing the x, y, z components of
the computed gradient field.
.SH EXAMPLES
.br
.nf
\fC
# create a 3D raster
g.region s=0 n=100 w=0 e=100 b=0 t=100 \-p
r3.mapcalc \(dqtest_gradient = sqrt(row()*row() +col()*col()+ depth()*depth())\(dq
# compute gradient
r3.gradient input=test_gradient output=grad_x,grad_y,grad_z
\fR
.fi
.SH SEE ALSO
\fI
r3.flow,
r.flow
\fR
.SH AUTHORS
Anna Petrasova, NCSU OSGeoREL,
developed during GSoC 2014.
.SH SOURCE CODE
.PP
Available at: r3.gradient source code (history)
.PP
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.PP
© 2003\-2020
GRASS Development Team,
GRASS GIS 7.8.5 Reference Manual