Ubuntu Manpage: v.out.ascii - Converts a GRASS binary vector map to a GRASS ASCII vector map.

NAME

       v.out.ascii  - Converts a GRASS binary vector map to a GRASS ASCII vector map.

KEYWORDS

       vector, export

SYNOPSIS

       v.out.ascii
       v.out.ascii help
       v.out.ascii    [-or]    input=name    [output=name]     [format=string]     [fs=character]
       [dp=integer]       [layer=integer]       [columns=name[,name,...]]       [where=sql_query]
       [--verbose]  [--quiet]

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

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

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       input=name
           Name of input vector map

       output=name
           Path to resulting ASCII file or ASCII vector name if '-o' is defined

       format=string
           Output format
           Options: point,standard
           Default: point

       fs=character
           Field separator
           Field separator (points mode)
           Default: |

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

       layer=integer
           Layer number
           A  single  vector  map  can  be  connected  to  multiple  database tables. This number
           determines which table to use.
           Default: 1

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

       where=sql_query
           WHERE conditions of SQL statement without 'where' keyword
           Example: income = 10000

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 coordinates of any point data within the
       vector map is sent to stdout.

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 module are useful
both for importing and exporting vector maps between GRASS and other software, and for
transferring data between machines.

If the format parameter is set to standard, a GRASS ASCII vector map will be exported,
which may contain a mix of primitives including points, lines, boundaries, centroids,
areas, faces, and kernels. The beginning of the output ascii file will contain a header
listing any metadata for the input vector map, if such metadata exists. An example of the
standard format is given below.

The header is similar as the head file of vector binary format but contains bounding box
also. Key words are:
ORGANIZATION
DIGIT DATE
DIGIT NAME
MAP NAME
MAP DATE
MAP SCALE
OTHER INFO
ZONE
WEST EDGE
EAST EDGE
SOUTH EDGE
NORTH EDGE
MAP THRESH

The body begins with the row:
VERTI:
followed by records of primitives:
TYPE NUMBER_OF_COORDINATES [NUMBER_OF_CATEGORIES]
X Y [Z]
X Y [Z]
[ LAYER CATEGORY]
[ LAYER CATEGORY]
Everything above in [ ] is optional.

The primitive codes are as follows:

’P': point

’L': line

’B': boundary

’C': centroid

’F': face (3D boundary)

’K': kernel (3D centroid)

’A': area (boundary) - better use 'B'; kept only for backward compatibility
The coordinates are listed following the initial line containing the primitive code, the
total number of vectors in the series, and (optionally) the number of categories (1 for a
single layer, higher for multiple layers). Below that 1 or several lines follow to
indicate the layer number and the category number (ID).
The order of coordinates is
X Y [Z]
In pre-GRASS 6 versions of the ASCII file, the order of coordinates is:
Y X
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.

Only features with a category number will be exported. Use v.category to add them if
needed.

v.out.ascii 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

       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

       v.out.ascii input=archsites format=point where="cat > 5 and cat <= 8" columns=str1
       600375|4925235|6|Prairie Site
       606635|4920773|7|Jensen Pass
       595755|4925300|8|No Name

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, CTU in Prague, Czech Republic (2008/12)

       Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

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