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NAME

       v.out.ascii  - Exports a vector map to a GRASS ASCII vector representation.
       By  default  only  features  with  category  are  exported.  To  export  all  features use
       ’layer=-1’.

KEYWORDS

       vector, export, ASCII

SYNOPSIS

       v.out.ascii
       v.out.ascii --help
       v.out.ascii [-ocr] input=name  [layer=string]   [type=string[,string,...]]   [output=name]
       [columns=name[,name,...]]        [cats=range]        [where=sql_query]       format=string
       [separator=character]     [precision=integer]     [--overwrite]    [--help]    [--verbose]
       [--quiet]  [--ui]

   Flags:
       -o
           Create old (version 4) ASCII file

       -c
           Include column names in output (points mode)

       -r
           Only export points falling within current 3D region (points mode)

       --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 vector map
           Or data source for direct OGR access

       layer=string
           Layer number or name (’-1’ for all layers)
           A  single  vector  map  can  be  connected  to  multiple  database tables. This number
           determines which table to use. When used with direct OGR  access  this  is  the  layer
           name.
           Default: 1

       type=string[,string,...]
           Input feature type
           Options: point, line, boundary, centroid, area, face, kernel
           Default: point,line,boundary,centroid,area,face,kernel

       output=name
           Name for output ASCII file or ASCII vector name if ’-o’ is defined
           If not given or ’-’ then standard output

       columns=name[,name,...]
           Name of attribute column(s) to be exported (point mode)
           "*" for all columns

       cats=range
           Category values
           Example: 1,3,7-9,13

       where=sql_query
           WHERE conditions of SQL statement without ’where’ keyword
           Example: income < 1000 and population >= 10000

       format=string [required]
           Output format
           Options: point, standard, wkt
           Default: point
           point: Simple point format (point per row)
           standard: GRASS ASCII vector format
           wkt: OGC well-known text

       separator=character
           Field separator
           Field separator (points mode)
           Default: pipe

       precision=integer
           Number of significant digits (floating point only)
           Options: 0-32
           Default: 8

DESCRIPTION

       v.out.ascii  converts  a  GRASS vector map in binary format to a GRASS vector map in ASCII
       format. Using flag -o v.out.ascii output will be in old (version 4) ASCII format.

       If the output parameter is not given then the data is sent to standard output.

NOTES

       The v.in.ascii module performs the function of v.out.ascii in reverse;  i.e.  it  converts
       vector maps in ASCII format to their binary format. These two companion modules are useful
       both for importing and exporting vector maps between GRASS and  other  software,  and  for
       transferring data between machines.

       If  old  version  is  requested,  the  output  files  from  v.out.ascii  is  placed in the
       $LOCATION/$MAPSET/dig_ascii/ and $LOCATION/$MAPSET/dig_att directory.

       If layer > 0 then only features with a category number will be exported. Use v.category to
       add them if needed or define layer=-1 to export also features without category.

       v.out.ascii  in  the old version mode (-o) does not copy the dig_cats file associated with
       the binary vector input map to the new output file name. The user must copy  the  dig_cats
       file to the new output name if this is desired (e.g. using the UNIX cp command).

       It  is  possible  to  output the coordinates of vertices in a non-points vector feature by
       first converting the vector feature to a points map with v.to.points  and  then  exporting
       with v.out.ascii in points mode.

EXAMPLES

   Standard mode
       See ASCII format specification.

       v.out.ascii input=quads format=standard
       ORGANIZATION: US Army Const. Eng. Rsch. Lab
       DIGIT DATE:   May 1987
       DIGIT NAME:   grass
       MAP NAME:     Quads
       MAP DATE:     May 1987
       MAP SCALE:    24000
       OTHER INFO:
       ZONE:         13
       MAP THRESH:   18.288000
       VERTI:
       B  4
        599587.1820962 4914067.53414294
        589639.15126831 4913922.5687301
        589440.96838162 4927803.62500018
        599375.87959179 4927959.83330436
       B  2
        599375.87959179 4927959.83330436
        599587.1820962 4914067.53414294
       B  4
        599587.1820962 4914067.53414294
        609541.5508239 4914236.0597482
        609316.10665227 4928116.8490555
        599375.87959179 4927959.83330436
       C  1 1
        594125.63    4921115.58
        1     1
       C  1 1
        604433.84    4921087.1
        1     2

   Point mode
       v.out.ascii input=quads format=point
       594125.63|4921115.58|1
       604433.84|4921087.1|2
       Print also selected attributes:
       v.out.ascii input=geodetic_pts format=point where="cat > 5 and cat <= 8" columns=GEOD_NAME
       573638.06289275|271623.25042595|6|27 WC 6
       574416.81289275|274116.65542595|7|27 WC 7
       575301.31189275|275303.81342595|8|27 WC 8
       To print all attributes type columns=*:
       v.out.ascii input=geodetic_pts format=point where="cat > 5 and cat <= 8" columns=*
       573638.06289275|271623.25042595|6|6|0.00000000|0.00000000|6|6|27 WC 6|573638.09200000|271623.24100000|0.00|0|1.00000000|1.00000000
       574416.81289275|274116.65542595|7|7|0.00000000|0.00000000|7|7|27 WC 7|574416.84100000|274116.64900000|0.00|0|1.00000000|1.00000000
       575301.31189275|275303.81342595|8|8|0.00000000|0.00000000|8|8|27 WC 8|575301.30600000|275303.82600000|0.00|0|1.00000000|1.00000000

   WKT mode
       WKT is abbreviation for Well-known text.
       v.out.ascii input=quads format=wkt
       POLYGON((599587.18209620 4914067.53414294, 589639.15126831 4913922.56873010,
                589440.96838162 4927803.62500018, 599375.87959179 4927959.83330436,
                599587.18209620 4914067.53414294))
       POLYGON((599587.18209620 4914067.53414294, 599375.87959179 4927959.83330436,
                609316.10665227 4928116.84905550, 609541.55082390 4914236.05974820,
                599587.18209620 4914067.53414294))

SEE ALSO

        v.category, v.in.ascii, v.to.points

       GRASS ASCII vector format specification
       GRASS SQL interface

AUTHORS

       Michael Higgins, U.S. Army Construction Engineering Research Laboratory
       James Westervelt, U.S. Army Construction Engineering Research Laboratory
       Radim Blazek, ITC-Irst, Trento, Italy
       Attribute  selection  added  by  Martin Landa, Czech Technical University in Prague, Czech
       Republic (2008/12)

       Last changed: $Date: 2014-05-13 17:16:33 +0200 (Tue, 13 May 2014) $

SOURCE CODE

       Available at: v.out.ascii source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.1 Reference Manual