## DESCRIPTION

The purpose of t.vect.extract is to extract a subset of a space time vector dataset and to store that subset in a different space time vector dataset.

## EXAMPLE

In the following example a new space time vector dataset will be create with all the data later than the year 2000:

    t.vect.extract input=shoreline where="start_time > 2000" \
                   output=shoreline_later_2000 basename=new_shoreline

    t.info shoreline_later_2000@shoreline type=stvds
     +-------------------- Space Time Vector Dataset -----------------------------+
     |                                                                            |
     +-------------------- Basic information -------------------------------------+
     | Id: ........................ shoreline_later_2000@shoreline
     | Name: ...................... shoreline_later_2000
     | Mapset: .................... shoreline
     | Creator: ................... lucadelu
     | Temporal type: ............. relative
     | Creation time: ............. 2014-11-29 08:43:50.043219
     | Modification time:.......... 2014-11-29 08:43:50.085407
     | Semantic type:.............. mean
     +-------------------- Relative time -----------------------------------------+
     | Start time:................. 2003
     | End time:................... 2009
     | Relative time unit:......... years
     | Granularity:................ 1
     | Temporal type of maps:...... point
     +-------------------- Spatial extent ----------------------------------------+
     | North:...................... 1039175.31479
     | South:...................... 34705.216018
     | East:.. .................... 3052322.44671
     | West:....................... 2130004.16779
     | Top:........................ 0.0
     | Bottom:..................... 0.0
     +-------------------- Metadata information ----------------------------------+
     | Vector register table:...... vector_map_register_8395740fc8de42149fef74a3d25bbb05
     | Number of points ........... 0
     | Number of lines ............ 407
     | Number of boundaries ....... 0
     | Number of centroids ........ 0
     | Number of faces ............ 0
     | Number of kernels .......... 0
     | Number of primitives ....... 407
     | Number of nodes ............ 767
     | Number of areas ............ 0
     | Number of islands .......... 0
     | Number of holes ............ 0
     | Number of volumes .......... 0
     | Number of registered maps:.. 3
     |
     | Title:
     | North Carolina shoreline
     | Description:
     | North Caroline shoreline from 2000 to 2009
     | Command history:
     | # 2014-11-29 08:43:50
     | t.vect.extract input="shoreline"
     |     where="start_time > 2000" output="shoreline_later_2000"
     |     basename="new_shoreline"
     | # 2014-11-29 08:44:14
     | t.support type="stvds"
     |     input="shoreline_later_2000@shoreline"
     |     descr="North Caroline shoreline from 2000 to 2009"
     +----------------------------------------------------------------------------+

    t.vect.list shoreline_later_2000
    name|layer|mapset|start_time|end_time
    shoreline_2003|None|shoreline|2003|None
    shoreline_2004|None|shoreline|2004|None
    shoreline_2009|None|shoreline|2009|None

## SEE ALSO

t.create, t.info

## AUTHOR

Sören Gebbert, Thünen Institute of Climate-Smart Agriculture