GRASS GIS manual: v.out.ascii

NAME

v.out.ascii - Exports a vector map to a GRASS ASCII vector representation.

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 [fs=character] [dp=integer] [--overwrite] [--verbose] [--quiet]

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
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=name [required]: Name of input vector map; Or data source for direct OGR access
layer=string [required]: Layer number or name; 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,...]: 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; '-' for standard output; Default: -
columns=name[,name,...]: Name of attribute column(s) to be exported (point mode)
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 inhab >= 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
fs=character: Field separator; Field separator (points mode); Default: |
dp=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 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 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

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))

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: 2011-11-08 13:24:20 -0800 (Tue, 08 Nov 2011) $

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