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r3.mkdspf(1grass) GRASS GIS User's Manual r3.mkdspf(1grass)

NAME

r3.mkdspf - Creates a display file from an existing 3D raster map according to specified threshold levels.

KEYWORDS

raster3d, display, voxel

SYNOPSIS

r3.mkdspf
r3.mkdspf --help
r3.mkdspf [-qf] input=string dspf=name [levels=float[,float,...]] [min=float] [max=float] [step=float] [tnum=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:


Suppress progress report & min/max information

Use flat shading rather than gradient

Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

Parameters:


Name of an existing 3D raster map

Name for output display file

List of thresholds for isosurfaces

Minimum isosurface level

Maximum isosurface level

Positive increment between isosurface levels

Number of isosurface threshold levels
Default: 7

DESCRIPTION

Creates a display file from an existing grid3 file according to specified threshold levels. The display file is a display list of polygons that represent isosurfaces of the data volume. If specific levels are given, additional optional parameters are ignored. Min or max may be used alone or together to specify a sub-range of the data. The step parameter is given precedence over tnum.

Flags:


Suppress progress report & min/max information

Use flat shading rather than gradient

Parameters:


Name of an existing 3D raster map

Name of output display file

List of thresholds for isosurfaces

Minimum isosurface level

Maximum isosurface level

Positive increment between isosurface levels

Number of isosurface threshold levels
Default: 7

Example:

With grid3 data (phdata) in the range 3-7, we only want to see isosurface values for the range 4-6. Any of these commands will produce the same results:

r3.mkdspf phdata dspf=iso min=4.0 max=6.0 tnum=5
r3.mkdspf phdata dspf=iso levels=4.0,4.5,5.0,5.5,6.0
r3.mkdspf phdata dspf=iso min=4.0 max=6.0 step=0.5

NOTE

Currently the grid3 file must be in the user’s mapset since the display files being created are specific to particular grid3 files and are contained in directories under them. We should create a mechanism where users may make display files from others’ grid3 files without having to copy them to their mapset.

AUTHOR

Bill Brown, bbrown@gis.uiuc.edu

SOURCE CODE

Available at: r3.mkdspf source code (history)

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© 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual

GRASS 7.8.6