Linux Certif

Toute la documentation sur la certification Linux LPI

r3.in.ascii.1grass

NAME

r3.in.ascii - Convert 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: none

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

Convert a 3D ASCII raster text file into a (binary) 3D raster map layer.

Parameters:

type

Data type used in the output file
Options: default, double, float

precision

Precision used in the output file
Options: default, max, 0-52

compression

Note that the none option only specifies that neither LZW nor RLE is used for compression. It does not turn off the compression all together. G3D does not support non-compressed files.
Options: default, rle, none

tiledimension

The dimension of the tiles used in the output file. The format is: XxYxZ

nv

Specifies which value to convert to NULL-value. If the specified value is none, no conversion is performed. Default is none.

input

Path and name of ASCII file to be imported

output

Name of the G3D output map

NOTES

The format for the 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 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
x1,y1,z1 x2,y1,z1 x3,y1,z1 x4,y1,z1
x1,y2,z1 x2,y2,z1 x3,y2,z1 x4,y2,z1
x1,y3,z1 x2,y3,z1 x3,y3,z1 x4,y3,z1
x1,y1,z2 x2,y1,z2 x3,y1,z2 x4,y1,z2
x1,y2,z2 x2,y2,z2 x3,y2,z2 x4,y2,z2
x1,y3,z2 x2,y3,z2 x3,y3,z2 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: 2006-10-16 14:20:14 +0200 (lun, 16 ott 2006) $

Full index

© 2003-2010 GRASS Development Team