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v.out.ascii

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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 (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

SEE ALSO

v.category, v.in.ascii, v.to.points 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, CTU in Prague, Czech Republic (2008/12) Last changed: $Date: 2010-02-17 08:56:18 +0100 (Wed, 17 Feb 2010) $ Full index (C) 2003-2010 GRASS Development Team V.OUT.ASCII(1)
 
 
 

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