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:
       -s
           SURFER (Golden Software) ASCII file will be imported

       --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 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:    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.

       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: Tuesday Jun 27 11:12:52 2023

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       © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual