NAME
r3.in.ascii - Converts a 3D ASCII raster text file into a (binary) 3D raster map.
KEYWORDS
raster3d,
import,
voxel,
conversion,
ASCII
SYNOPSIS
r3.in.ascii
r3.in.ascii --help
r3.in.ascii input=name output=name [null_value=string] [type=string] [precision=string] [compression=string] [tiledimension=XxYxZ] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --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=name [required]
- Name of input file to be imported
- '-' for standard input
- output=name [required]
- Name for output 3D raster map
- null_value=string
- String representing NULL value data cell (use 'none' if no such value)
- Default: *
- type=string
- Data type used in the output raster3d map
- Options: default, double, float
- Default: default
- precision=string
- Number of digits used as mantissa in the internal map storage, 0 -23 for float, 0 - 52 for double, max or default
- Default: default
- compression=string
- The compression method used in the output raster3d map
- Options: default, zip, none
- Default: default
- tiledimension=XxYxZ
- The dimensions of the tiles used in the output raster3d map (XxYxZ or default: 16x16x8)
- Default: default
r3.in.ascii allows a user to create a (binary) GRASS 3D raster map
layer from a 3D ASCII raster input file.
The tiledimension parameter defines the dimension of the tiles
used in the output file. The format is: XxYxZ
The nv parameter specifies which value to convert to NULL-value.
If the specified value is none, no conversion is performed.
Default is none.
The data is automatically imported into the correct internal coordinate system,
that is visualized in the following picture, independently from the specified
ordering in the ASCII input file:
![](raster3d_layout.png)
The volume coordinate system and tile layout of the imported voxel map
|
The format of the 3D ASCII file:
version: "grass7"
order: "nsbt" or "nstb" or "snbt" or "sntb"
north: floating point
south: floating point
east: floating point
west: floating point
top: floating point
bottom: floating point
rows: integer
cols: integer
levels: integer
The version and order option have been introduced in GRASS 7 in June 2011.
The version option is self explaining. The order option specifies the row
and depth order of the data in the input file.
The supported row/depth ordering is documented in the
r3.out.ascii
manual page. The order of the data in the input file does not specify the
data order in the generated output 3D raster map which is in any case
north -> south, west -> east, bottom -> top order.
So dependent on the order information the data is automatically imported
into the correct internal coordinate system.
The version and order options are not mandatory. In case no version and
order option is specified, the default GRASS 6 ASCII format is assumed.
This header is followed by the cell values in floating point format
organized in rows with constant col and level coordinate.
The rows are organized by constant level coordinate. Individual cell
values are separated by space or CR.
4x3x2 sample. Note in case no specific ordering is specified in the input
file the upper-left (NW) corner of the bottom level comes first. The according
order option is: nsbt for north -> south, bottom -> top ordering. This is
identical with
r.in.ascii for single level data. So the y coordinate
is 0 at the northern edge.
north: 3.0
south: 0.0
east: 4.0
west: 0.0
top: 2.0
bottom: 0.0
rows: 3
cols: 4
levels: 2
w
111x1,y1,z1 w
211x2,y1,z1 w
311x3,y1,z1 w
411x4,y1,z1
w
121x1,y2,z1 w
221x2,y2,z1 w
321x3,y2,z1 w
421x4,y2,z1
w
131x1,y3,z1 w
231x2,y3,z1 w
331x3,y3,z1 w
431x4,y3,z1
w
112x1,y1,z2 w
212x2,y1,z2 w
312x3,y1,z2 w
412x4,y1,z2
w
122x1,y2,z2 w
222x2,y2,z2 w
322x3,y2,z2 w
422x4,y2,z2
w
132x1,y3,z2 w
232x2,y3,z2 w
332x3,y3,z2 w
432x4,y3,z2
Note that unit tests for r3.in.ascii are implemented in the
test.r3.out.ascii.sh script located in the
r3.out.ascii directory.
Please refer to the detailed examples in
r3.out.ascii.
r.in.ascii,
r3.out.ascii,
v.to.rast3,
g.region
Roman Waupotitsch, Michael Shapiro,
Helena Mitasova, Bill Brown, Lubos Mitas, Jaro Hofierka, Sören Gebbert
SOURCE CODE
Available at:
r3.in.ascii source code
(history)
Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual