NAME

       t.vect.export  - Exports a space time vector dataset as GRASS GIS specific archive file.

KEYWORDS

       temporal, export, vector, time

SYNOPSIS

       t.vect.export
       t.vect.export --help
       t.vect.export     input=name    output=name     [directory=name]      [compression=string]
       [format=string]    [where=sql_query]    [--overwrite]   [--help]   [--verbose]   [--quiet]
       [--ui]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       input=name [required]
           Name of the input space time vector dataset

       output=name [required]
           Name of a space time vector dataset archive

       directory=name
           Path to the work directory, default is /tmp
           Default: /tmp

       compression=string
           Compression method of the tar archive
           Options: no, gzip, bzip2
           Default: bzip2

       format=string
           The export format of a single vector map
           Supported are GML via v.out.ogr and the GRASS package format of v.pack
           Options: GML, pack
           Default: GML

       where=sql_query
           WHERE  conditions  of  SQL  statement without ’where’ keyword used in the temporal GIS
           framework
           Example: start_time > ’2001-01-01 12:30:00’

DESCRIPTION

       t.vect.export exports a space time vector dataset (stvds) to a tar archive as  either  GML
       (using  v.out.ogr)  or  GRASS  pack  files.  In addition to the pack or GML files, several
       metadata files are also created in the archive that describe the temporal layout. All time
       stamps  are  stored in the file "list.txt", for each map one row. The name of the map, the
       start time and the end time are written. In case of a time instance,  the  start  time  is
       equal  to  the end time. The "init.txt" file stores the temporal type, the number of maps,
       the chosen export  format  and  some  other  metadata.  The  "proj.txt"  file  stores  the
       projection information as a proj4 string of the location the space time vector dataset was
       exported from. The file "readme.txt" describes the file format. The output of  v.info  for
       each vector map in the space time dataset is stored in "metadata.txt".

       The  tar archive can be compressed using the compress option. Gzip and bzip2 (default) are
       available. A where option can be specified, to export only a  subset  of  the  space  time
       dataset. Archives exported with t.vect.export can be imported with t.vect.import.

EXAMPLE

       In this example, five vector maps are created and registered in a single space time vector
       dataset named random_locations.  Each vector map represents random  locations  within  the
       boundary of the state taken at 1 month intervals.
       t.vect.export input=shoreline output=shoreline_nc
       tar xvfj shoreline_nc
       shoreline_1849_1873.xml
       shoreline_1849_1873.xsd
       shoreline_1925_1946.xml
       shoreline_1925_1946.xsd
       shoreline_1970_1988.xml
       shoreline_1970_1988.xsd
       shoreline_1997.xml
       shoreline_1997.xsd
       shoreline_1998.xml
       shoreline_1998.xsd
       shoreline_2003.xml
       shoreline_2003.xsd
       shoreline_2004.xml
       shoreline_2004.xsd
       shoreline_2009.xml
       shoreline_2009.xsd
       list.txt
       proj.txt
       init.txt
       readme.txt
       metadata.txt
       cat init.txt
       stds_type=stvds
       format=GML
       temporal_type=relative
       semantic_type=mean
       relative_time_unit=years
       number_of_maps=8
       north=1039175.31479
       south=9403.301982
       east=3052352.00337
       west=651481.84739
       cat proj.txt
       +proj=lcc
       +lat_1=36.16666666666666
       +lat_2=34.33333333333334
       +lat_0=33.75
       +lon_0=-79
       +x_0=609601.22
       +y_0=0
       +no_defs
       +a=6378137
       +rf=298.257222101
       +towgs84=0.000,0.000,0.000
       +to_meter=1
       cat list.txt
       shoreline_1849_1873|1849|1873
       shoreline_1925_1946|1925|1946
       shoreline_1970_1988|1970|1988
       shoreline_1997|1997|1997
       shoreline_1998|1998|1998
       shoreline_2003|2003|2003
       shoreline_2004|2004|2004
       shoreline_2009|2009|2009
       cat readme.txt
       This space time vector dataset was exported with t.vect.export of GRASS GIS 7
       Files:
              *.xml  -- Vector GML files
            proj.txt -- Projection information in PROJ.4 format
            init.txt -- GRASS GIS space time vector dataset information
            list.txt -- Time series file, lists all maps by name with interval
                        time stamps in ISO-Format. Field separator is |
        metadata.txt -- The output of t.info
          readme.txt -- This file

SEE ALSO

        t.vect.import, t.create, t.info, v.out.ogr, v.unpack, t.rast.export

AUTHOR

       Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

       Last changed: $Date: 2015-10-06 17:26:07 +0200 (Tue, 06 Oct 2015) $

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       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual