Geografic-Information-System/vector/v.out.ascii/v.out.ascii.html

<h2>DESCRIPTION</h2>

<em>v.out.ascii</em> converts a GRASS vector map in binary format to a
GRASS vector map in <a href="vectorascii.html">ASCII format</a>. Using
flag <b>-o</b> <em>v.out.ascii</em> output will be in old (version 4)
ASCII format.

<p>If the <b>output</b> parameter is not given then the data is sent
to standard output.

<h2>NOTES</h2>

The <em><a href="v.in.ascii.html">v.in.ascii</a></em> module performs
the function of <em>v.out.ascii</em> 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.

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

<p>If <b>layer &gt; 0</b> then only features with a category number
will be exported. Use <em><a href="v.category.html">v.category</a></em> to add
them if needed or define <b>layer=-1</b> to export also features without category.

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

<p>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 
<em><a href="v.to.points.html">v.to.points</a></em> and then exporting
with <em>v.out.ascii</em> in
<b>points</b> mode.

<h2>EXAMPLES</h2>

<h3>Standard mode</h3>

See <a href="vectorascii.html">ASCII format</a> specification.

<p><div class="code"><pre>
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
</pre></div>

<h3>Point mode</h3>

<div class="code"><pre>
v.out.ascii input=quads format=point

594125.63|4921115.58|1
604433.84|4921087.1|2
</pre></div>

Print also selected attributes:

<div class="code"><pre>
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
</pre></div>

To print all attributes type <b>columns=*</b>:

<div class="code"><pre>
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
</pre></div>

<h3>WKT mode</h3>

WKT is abbreviation
for <a href="http://en.wikipedia.org/wiki/Well-known_text">Well-known
text</a>.

<div class="code"><pre>
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))
</pre></div>

<h2>SEE ALSO</h2>

<em>
<a href="v.category.html">v.category</a>,
<a href="v.in.ascii.html">v.in.ascii</a>,
<a href="v.to.points.html">v.to.points</a>
</em>
<p>
<a href="vectorascii.html">GRASS ASCII vector format</a> specification<br>
<a href="sql.html">GRASS SQL interface</a>

<h2>AUTHORS</h2>

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

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