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v.out.ascii
Langue: en
Version: 147827 (fedora - 04/07/09)
Section: 1 (Commandes utilisateur)
Sommaire
NAME
v.out.ascii - Converts a GRASS binary vector map to a GRASS ASCII vector map.KEYWORDS
vectorSYNOPSIS
v.out.asciiv.out.ascii help
v.out.ascii [-or] input=name [output=string] [format=string] [fs=string] [dp=integer] [--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=string
Path to resulting ASCII file or ASCII vector name if '-o' is defined- format=string
Output format
Options: point,standard
Default: point- fs=string
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 GRASS program v.in.ascii 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 programs 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, if such metadata exists. An example of the standard format is given below.
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 order of coordinates for new (standard) version of ASCII file is
X Y [Z]
the order of coordinates for old version of ASCII file is
Y X
If old version is requested, the output files from v.out.ascii will be 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
Example 1a) - standard mode - using the 'quads' vector from Spearfish dataset:
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
Example 1b) - point mode
v.out.ascii input=quads format=point
594125.63|4921115.58|1
604433.84|4921087.1|2
SEE ALSO
v.categoryv.in.ascii
v.to.points
Vector ASCII Format Specification
AUTHORS
Michael Higgins, U.S. Army Construction Engineering Research LaboratoryJames Westervelt, U.S. Army Construction Engineering Research Laboratory
Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date: 2006-12-13 17:10:28 +0100 (Wed, 13 Dec 2006) $
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