t.vect.exportgrass - Online in the Cloud

PROGRAM:

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

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