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NAME

       t.snap  - Snaps temporally the maps of a space time dataset.

KEYWORDS

       temporal, time management, snapping, time

SYNOPSIS

       t.snap
       t.snap --help
       t.snap input=name  [type=name]   [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       input=name [required]
           Name of an existing space time dataset

       type=name
           Type of the input space time dataset
           Options: strds, stvds, str3ds
           Default: strds

DESCRIPTION

       t.snap  is  designed  to  convert  time instances of maps into time intervals or to create
       valid temporal topologies for space time datasets. Raster, 3D raster and vector space time
       datasets are supported with absolute and relative time.

       This  module  "snaps"  the  end time of each registered map of a space time dataset to the
       start time of the map that is the temporal nearest neighbour  in  the  future.  Maps  with
       equal  time  stamps  are  not  modified  and must be removed or modified to create a valid
       temporal topology. In case the last map in the space time dataset is a time instance,  the
       granularity of the space time dataset will be used to create the time interval.

EXAMPLE

       A  raster  space  time dataset will be create using precipitation maps for 2012 then using
       absolute time in a space time raster dataset using an increment of one month.  At the  end
       we snap the created time instances resulting in time intervals.
       # Generate data
       t.create type=strds temporaltype=absolute \
                output=precipitation_monthly \
                title="Monthly precipitation" \
                description="Dataset with monthly precipitation"
       t.register type=raster input=precipitation_monthly \
                  maps=`g.list type=raster pattern="2012*precip" sep=comma` \
                  start=2012-01-01 increment="1 months"
       # please take attention to "Temporal type of maps" value
       t.info type=strds input=precipitation_monthly
        +-------------------- Space Time Raster Dataset -----------------------------+
        |                                                                            |
        +-------------------- Basic information -------------------------------------+
        | Id: ........................ precipitation_monthly@climate_2009_2012
        | Name: ...................... precipitation_monthly
        | Mapset: .................... climate_2009_2012
        | Creator: ................... lucadelu
        | Temporal type: ............. absolute
        | Creation time: ............. 2014-11-28 15:52:30.801148
        | Modification time:.......... 2014-11-28 15:53:18.430773
        | Semantic type:.............. mean
        +-------------------- Absolute time -----------------------------------------+
        | Start time:................. 2012-01-01 00:00:00
        | End time:................... 2012-12-01 00:00:00
        | Granularity:................ 1 month
        | Temporal type of maps:...... point
        +-------------------- Spatial extent ----------------------------------------+
        | North:...................... 320000.0
        | South:...................... 10000.0
        | East:.. .................... 935000.0
        | West:....................... 120000.0
        | Top:........................ 0.0
        | Bottom:..................... 0.0
        +-------------------- Metadata information ----------------------------------+
        | Raster register table:...... raster_map_register_282454f66ff5455299526ec3c1db7362
        | North-South resolution min:. 500.0
        | North-South resolution max:. 500.0
        | East-west resolution min:... 500.0
        | East-west resolution max:... 500.0
        | Minimum value min:.......... 0.0
        | Minimum value max:.......... 95.58169
        | Maximum value min:.......... 132.413284
        | Maximum value max:.......... 356.502949
        | Aggregation type:........... None
        | Number of registered maps:.. 12
        |
        | Title:
        | Monthly precipitation
        | Description:
        | Dataset with monthly precipitation
        | Command history:
        | # 2014-11-28 15:52:30
        | t.create type="strds" temporaltype="absolute"
        |     output="precipitation_monthly" title="Monthly precipitation"
        |     description="Dataset with monthly precipitation"
        | # 2014-11-28 15:53:18
        | t.register type="rast" input="precipitation_monthly"
        |     maps="2012_01_precip,2012_02_precip, ... ,2012_11_precip,2012_12_precip"
        |     start="2012-01-01" increment="1 months"
        |
        +----------------------------------------------------------------------------+
       # you can see that end time is not set
       t.rast.list input=precipitation_monthly
       name|mapset|start_time|end_time
       2012_01_precip|climate_2009_2012|2012-01-01 00:00:00|None
       2012_02_precip|climate_2009_2012|2012-02-01 00:00:00|None
       2012_03_precip|climate_2009_2012|2012-03-01 00:00:00|None
       2012_04_precip|climate_2009_2012|2012-04-01 00:00:00|None
       2012_05_precip|climate_2009_2012|2012-05-01 00:00:00|None
       2012_06_precip|climate_2009_2012|2012-06-01 00:00:00|None
       2012_07_precip|climate_2009_2012|2012-07-01 00:00:00|None
       2012_08_precip|climate_2009_2012|2012-08-01 00:00:00|None
       2012_09_precip|climate_2009_2012|2012-09-01 00:00:00|None
       2012_10_precip|climate_2009_2012|2012-10-01 00:00:00|None
       2012_11_precip|climate_2009_2012|2012-11-01 00:00:00|None
       2012_12_precip|climate_2009_2012|2012-12-01 00:00:00|None
       t.snap type=strds input=precipitation_monthly
       # please take attention to "Temporal type of maps" value again
       t.info type=strds input=precipitation_monthly
        +-------------------- Space Time Raster Dataset -----------------------------+
        |                                                                            |
        +-------------------- Basic information -------------------------------------+
        | Id: ........................ precipitation_monthly@climate_2009_2012
        | Name: ...................... precipitation_monthly
        | Mapset: .................... climate_2009_2012
        | Creator: ................... lucadelu
        | Temporal type: ............. absolute
        | Creation time: ............. 2014-11-28 15:52:30.801148
        | Modification time:.......... 2014-11-28 15:54:28.739905
        | Semantic type:.............. mean
        +-------------------- Absolute time -----------------------------------------+
        | Start time:................. 2012-01-01 00:00:00
        | End time:................... 2013-01-01 00:00:00
        | Granularity:................ 1 month
        | Temporal type of maps:...... interval
        +-------------------- Spatial extent ----------------------------------------+
        | North:...................... 320000.0
        | South:...................... 10000.0
        | East:.. .................... 935000.0
        | West:....................... 120000.0
        | Top:........................ 0.0
        | Bottom:..................... 0.0
        +-------------------- Metadata information ----------------------------------+
        | Raster register table:...... raster_map_register_282454f66ff5455299526ec3c1db7362
        | North-South resolution min:. 500.0
        | North-South resolution max:. 500.0
        | East-west resolution min:... 500.0
        | East-west resolution max:... 500.0
        | Minimum value min:.......... 0.0
        | Minimum value max:.......... 95.58169
        | Maximum value min:.......... 132.413284
        | Maximum value max:.......... 356.502949
        | Aggregation type:........... None
        | Number of registered maps:.. 12
        |
        | Title:
        | Monthly precipitation
        | Description:
        | Dataset with monthly precipitation
        | Command history:
        | # 2014-11-28 15:52:30
        | t.create type="strds" temporaltype="absolute"
        |     output="precipitation_monthly" title="Monthly precipitation"
        |     description="Dataset with monthly precipitation"
        | # 2014-11-28 15:53:18
        | t.register type="rast" input="precipitation_monthly"
        |     maps="2012_01_precip,2012_02_precip, ... ,2012_11_precip,2012_12_precip"
        |     start="2012-01-01" increment="1 months"
        | # 2014-11-28 15:54:28
        | t.snap type="strds" input="precipitation_monthly"
        |
        +----------------------------------------------------------------------------+
       # now instead end time is set
       t.rast.list input=precipitation_daily
       2012_01_precip|climate_2009_2012|2012-01-01 00:00:00|2012-02-01 00:00:00
       2012_02_precip|climate_2009_2012|2012-02-01 00:00:00|2012-03-01 00:00:00
       2012_03_precip|climate_2009_2012|2012-03-01 00:00:00|2012-04-01 00:00:00
       2012_04_precip|climate_2009_2012|2012-04-01 00:00:00|2012-05-01 00:00:00
       2012_05_precip|climate_2009_2012|2012-05-01 00:00:00|2012-06-01 00:00:00
       2012_06_precip|climate_2009_2012|2012-06-01 00:00:00|2012-07-01 00:00:00
       2012_07_precip|climate_2009_2012|2012-07-01 00:00:00|2012-08-01 00:00:00
       2012_08_precip|climate_2009_2012|2012-08-01 00:00:00|2012-09-01 00:00:00
       2012_09_precip|climate_2009_2012|2012-09-01 00:00:00|2012-10-01 00:00:00
       2012_10_precip|climate_2009_2012|2012-10-01 00:00:00|2012-11-01 00:00:00
       2012_11_precip|climate_2009_2012|2012-11-01 00:00:00|2012-12-01 00:00:00
       2012_12_precip|climate_2009_2012|2012-12-01 00:00:00|2013-01-01 00:00:00

SEE ALSO

        t.shift, t.create, t.register

AUTHOR

       Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

       Last changed: $Date: 2015-08-24 18:26:08 +0200 (Mon, 24 Aug 2015) $

SOURCE CODE

       Available at: t.snap source code (history)

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