
NAME
r3.in.ascii - Converts a 3D ASCII raster text file into a (binary) 3D raster map layer.
KEYWORDS
raster3d, voxel, import
SYNOPSIS
r3.in.ascii
r3.in.ascii help
r3.in.ascii input=name output=name [nv=string] [type=string] [precision=string] [compression=string] [tiledimension=XxYxZ] [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- input=name
- ASCII raster map to be imported
- output=name
- Name for output raster3d map
- nv=string
- String representing NULL value data cell (use 'none' if no such value)
- Default: *
- type=string
- Data type used in the output file
- Options: default,double,float
- Default: default
- precision=string
- Precision used in the output file (default, max, or 0 to 52)
- Default: default
- compression=string
- The compression method used in the output file
- Options: default,rle,none
- Default: default
- tiledimension=XxYxZ
- The dimensions of the tiles used in the output file
- Default: default
DESCRIPTION
r3.in.ascii allows a user to create a (binary) GRASS 3D raster map
layer from a 3D ASCII raster input file with (optional) TITLE.
Note that for compression the none option only specifies
that neither LZW nor RLE is used for compression. It
does not turn off the compression all together. 3D raster maps do
not support non-compressed files.
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.
NOTES
The format of the 3D ASCII file:
north: floating point
south: floating point
east: floating point
west: floating point
top: floating point
bottom: floating point
rows: integer
cols: integer
levels: integer
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.
NOTE: Currently, after the file has been imported, the stored values are
compared with the original data. This feature is used to find bugs in the
library at an early stage and will be turned off as soon as confidence has
built up.
EXAMPLES
4x3x2 sample. Note, that lower-left (SW) corner of the bottom level comes first.
This array format, where EW is preserved but NS is flipped, is sometimes
known as "ij" coordinates.
This is opposite to r.in.ascii's format, which places the SW corner
at the beginning of the last row of data.
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(x1,y1,z1) w(x2,y1,z1) w(x3,y1,z1) w(x4,y1,z1)
w(x1,y2,z1) w(x2,y2,z1) w(x3,y2,z1) w(x4,y2,z1)
w(x1,y3,z1) w(x2,y3,z1) w(x3,y3,z1) w(x4,y3,z1)
w(x1,y1,z2) w(x2,y1,z2) w(x3,y1,z2) w(x4,y1,z2)
w(x1,y2,z2) w(x2,y2,z2) w(x3,y2,z2) w(x4,y2,z2)
w(x1,y3,z2) w(x2,y3,z2) w(x3,y3,z2) w(x4,y3,z2)
Sample ASCII voxel map with one layer and several rows and columns (Spearfish area):
north: 4925010.000000
south: 4924890.000000
east: 596760.000000
west: 596610.000000
top: 1.000000
bottom: 0.000000
rows: 4
cols: 5
levels: 1
1204.74 1204.48 1204.19 1203.81 1203.39
1203.89 1203.67 1203.34 1202.98 1202.43
1203.05 1202.80 1202.51 1202.11 1201.48
1202.10 1201.92 1201.62 1201.27 1200.68
AUTHORS
Roman Waupotitsch, Michael Shapiro,
Helena Mitasova, Bill Brown, Lubos Mitas, Jaro Hofierka
SEE ALSO
r.in.ascii,
r3.out.ascii,
v.to.rast3
Last changed: $Date: 2012-11-15 04:53:59 -0800 (Thu, 15 Nov 2012) $
Main index - raster3D index - Full index
© 2003-2013 GRASS Development Team