table of contents
r.in.ascii(1grass) | GRASS GIS User's Manual | r.in.ascii(1grass) |
NAME¶
r.in.ascii - Converts a GRASS ASCII raster file to binary raster map.
KEYWORDS¶
raster, import, conversion, ASCII
SYNOPSIS¶
r.in.ascii
r.in.ascii --help
r.in.ascii [-s] input=name
output=name [type=string]
[title=phrase] [multiplier=float]
[null_value=string] [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
Flags:¶
Parameters:¶
- input=name [required]
-
Name of input file to be imported
’-’ for standard input - output=name [required]
-
Name for output raster map - type=string
-
Type of raster map to be created
Default: CELL for integer values, DCELL for floating-point values
Options: CELL, FCELL, DCELL
CELL: Integer
FCELL: Single precision floating point
DCELL: Double precision floating point - title=phrase
-
Title for resultant raster map - multiplier=float
-
Multiplier for ASCII data
Default: read from header - null_value=string
-
String representing NULL value data cell
Default: 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: cThe 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.
The imported cell type can be forced using the type option, default is auto-detection.
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.gdal.
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.import, r.out.ascii, r.in.gdal, r.out.gdal, r.in.bin, r3.in.ascii
AUTHORS¶
Michael Shapiro, U.S. Army Construction Engineering Research
Laboratory
Surfer support by Roger Miller
SOURCE CODE¶
Available at: r.in.ascii source code (history)
Accessed: Saturday Jul 27 17:08:09 2024
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