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: 2009-02-03 17:36:44 -0800 (Tue, 03 Feb 2009) $

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       © 2003-2013 GRASS Development Team