NAME¶
r.in.ascii - Converts ASCII raster file to binary raster map
layer.
KEYWORDS¶
raster, import, conversion
SYNOPSIS¶
r.in.ascii
r.in.ascii help
r.in.ascii [-
ifds] [
input=
name]
output=
name [
title=
"phrase"]
[
mult=
float] [
nv=
string] [--
overwrite]
[--
verbose] [--
quiet]
Flags:¶
- -i
-
Integer values are imported
- -f
-
Floating point values are imported
- -d
-
Double floating point values are imported
- -s
-
SURFER (Golden Software) ASCII file will be imported
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- input=name
-
ASCII raster file to be imported. If not given reads from standard
input
- output=name
-
Name for output raster map
- title=
-
Title for resultant raster map
- mult=float
-
Multiplier for ASCII data
Default: 1.0 or read from header
- nv=string
-
String representing NULL value data cell
Default: * or read from header
DESCRIPTION¶
r.in.ascii allows a user to create a (binary) GRASS raster map layer from
an ASCII raster input file with (optional) TITLE.
The GRASS ASCII
input file has a header section which describes the
location and size of the data, followed by the data itself.
The header has 6 lines:
north: xxxxxx.xx
south: xxxxxx.xx
east: xxxxxx.xx
west: xxxxxx.xx
rows: r
cols: c
The north, south, east, and west field values entered are the coordinates of the
edges of the geographic region. The rows and cols field values entered
describe the dimensions of the matrix of data to follow. The data which
follows is
r rows of
c integers.
Optionally the following parameters can be defined in the header section:
null: nn
type: float
multiplier: 2.
"null" defines a string or number to be converted to NULL value (no
data).
"type" defines the data type (int, float double) and is not required.
"multiplier" is an optional parameter to multiply each cell value.
NOTES¶
The geographic coordinates north, south, east, and west describe the outer edges
of the geographic region. They run along the edges of the cells at the edge of
the geographic region and
not through the center of the cells at the
edges. The NW value occurs at the beginning of the first line of data, and the
SW value occurs at the beginning of the last line of data.
The data (which follows the header section) must contain r
x c values,
but it is not necessary that all the data for a row be on one line. A row may
be split over many lines.
r.in.ascii may import
integer,
floating point, or
double cell types using the
-i,
-f, and
-d flags,
respectively.
The header information in ESRI Raster ASCII files differs from GRASS. To convert
an Arc/Info (ArcView) ASCII grid file into GRASS, see
r.in.arc.
SURFER (Golden Software) ASCII files may be imported by passing the
-s
flag.
EXAMPLE¶
The following is a sample
input file to
r.in.ascii:
north: 4299000.00
south: 4247000.00
east: 528000.00
west: 500000.00
rows: 10
cols: 15
null: -9999
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SEE ALSO¶
r.out.ascii, r.in.arc, r.in.gdal, r.out.arc,
r.in.bin, r3.in.ascii, GRASS ASCII formats
AUTHOR¶
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
Surfer support by Roger Miller
Last changed: $Date: 2009-02-04 02:43:30 +0100 (Wed, 04 Feb 2009) $
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