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NAME

       t.merge  - Merges several space time datasets into a single space time dataset.

KEYWORDS

       temporal, time management, merge, time

SYNOPSIS

       t.merge
       t.merge --help
       t.merge   inputs=name[,name,...]   output=name    [type=name]     [--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:
       inputs=name[,name,...] [required]
           Name of the input space time datasets

       output=name [required]
           Name of the output space time dataset

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

DESCRIPTION

       This module is designed to register the maps of several input space  time  datasets  in  a
       single output dataset. The datasets to merge can be either space time raster, 3D raster or
       vector datasets and must have the same temporal type (absolute or relative).

       Existing space time datasets located in the current mapset can be specified as  output  as
       well. The maps from the input space time datasets will be added to the output.

       Maps  from  the input space time datasets will be registered only once in the output space
       time dataset, hence the same  maps  can  be  registered  in  different  input  space  time
       datasets.

NOTES

       Temporal  databases  stored in other mapsets can be used as long as they are in the user’s
       current mapset search path (managed with g.mapsets).

Examples

       In this example we will create two space time raster datasets and register two unique maps
       in each of it. Then we merge the two space time raster datasets together.
       r.mapcalc expression="map1 = rand(0, 10)"  -s
       r.mapcalc expression="map2 = rand(10, 20)" -s
       t.create type=strds temporaltype=absolute \
                output=precipitation_daily_1 \
                title="Daily precipitation" \
                description="Test dataset with daily precipitation"
       t.register -i type=raster input=precipitation_daily_1 \
                  maps=map1,map2 start=2012-08-20 increment="1 days"
       t.info precipitation_daily_1
        +-------------------- Space Time Raster Dataset -----------------------------+
        |                                                                            |
        +-------------------- Basic information -------------------------------------+
        | Id: ........................ precipitation_daily_1@soeren
        | Name: ...................... precipitation_daily_1
        | Mapset: .................... soeren
        | Creator: ................... soeren
        | Temporal type: ............. absolute
        | Creation time: ............. 2014-11-23 15:26:57.395355
        | Modification time:.......... 2014-11-23 15:26:57.860513
        | Semantic type:.............. mean
        +-------------------- Absolute time -----------------------------------------+
        | Start time:................. 2012-08-20 00:00:00
        | End time:................... 2012-08-22 00:00:00
        | Granularity:................ 1 day
        | Temporal type of maps:...... interval
        +-------------------- Spatial extent ----------------------------------------+
        | North:...................... 80.0
        | South:...................... 0.0
        | East:.. .................... 120.0
        | West:....................... 0.0
        | Top:........................ 0.0
        | Bottom:..................... 0.0
        +-------------------- Metadata information ----------------------------------+
        | Raster register table:...... raster_map_register_6e6efe25ee9b40e39eb31421d737439b
        | North-South resolution min:. 10.0
        | North-South resolution max:. 10.0
        | East-west resolution min:... 10.0
        | East-west resolution max:... 10.0
        | Minimum value min:.......... 0.0
        | Minimum value max:.......... 10.0
        | Maximum value min:.......... 9.0
        | Maximum value max:.......... 19.0
        | Aggregation type:........... None
        | Number of registered maps:.. 2
        |
        | Title:
        | Daily precipitation
        | Description:
        | Test dataset with daily precipitation
        | Command history:
        | # 2014-11-23 15:26:57
        | t.create type="strds" temporaltype="absolute"
        |     output="precipitation_daily_1" title="Daily precipitation"
        |     description="Test dataset with daily precipitation"
        | # 2014-11-23 15:26:57
        | t.register -i type="rast"
        |     input="precipitation_daily_1" maps="map1,map2" start="2012-08-20"
        |     increment="1 days"
        |
        +----------------------------------------------------------------------------+
       r.mapcalc expression="map3 = rand(20, 30)" -s
       r.mapcalc expression="map4 = rand(30, 40)" -s
       t.create type=strds temporaltype=absolute \
                output=precipitation_daily_2 \
                title="Daily precipitation" \
                description="Test dataset with daily precipitation"
       t.register -i type=raster input=precipitation_daily_2 \
                  maps=map3,map4 start=2012-08-22 increment="1 days"
       t.info precipitation_daily_2
        +-------------------- Space Time Raster Dataset -----------------------------+
        |                                                                            |
        +-------------------- Basic information -------------------------------------+
        | Id: ........................ precipitation_daily_2@soeren
        | Name: ...................... precipitation_daily_2
        | Mapset: .................... soeren
        | Creator: ................... soeren
        | Temporal type: ............. absolute
        | Creation time: ............. 2014-11-23 15:27:20.165074
        | Modification time:.......... 2014-11-23 15:27:20.613543
        | Semantic type:.............. mean
        +-------------------- Absolute time -----------------------------------------+
        | Start time:................. 2012-08-22 00:00:00
        | End time:................... 2012-08-24 00:00:00
        | Granularity:................ 1 day
        | Temporal type of maps:...... interval
        +-------------------- Spatial extent ----------------------------------------+
        | North:...................... 80.0
        | South:...................... 0.0
        | East:.. .................... 120.0
        | West:....................... 0.0
        | Top:........................ 0.0
        | Bottom:..................... 0.0
        +-------------------- Metadata information ----------------------------------+
        | Raster register table:...... raster_map_register_04eaede279b2476a80c2683254232f84
        | North-South resolution min:. 10.0
        | North-South resolution max:. 10.0
        | East-west resolution min:... 10.0
        | East-west resolution max:... 10.0
        | Minimum value min:.......... 20.0
        | Minimum value max:.......... 30.0
        | Maximum value min:.......... 29.0
        | Maximum value max:.......... 39.0
        | Aggregation type:........... None
        | Number of registered maps:.. 2
        |
        | Title:
        | Daily precipitation
        | Description:
        | Test dataset with daily precipitation
        | Command history:
        | # 2014-11-23 15:27:20
        | t.create type="strds" temporaltype="absolute"
        |     output="precipitation_daily_2" title="Daily precipitation"
        |     description="Test dataset with daily precipitation"
        | # 2014-11-23 15:27:20
        | t.register -i type="rast"
        |     input="precipitation_daily_2" maps="map3,map4" start="2012-08-22"
        |     increment="1 days"
        |
        +----------------------------------------------------------------------------+
       t.merge input=precipitation_daily_1,precipitation_daily_2 \
               output=precipitation_daily_3
       t.info precipitation_daily_3
        +-------------------- Space Time Raster Dataset -----------------------------+
        |                                                                            |
        +-------------------- Basic information -------------------------------------+
        | Id: ........................ precipitation_daily_3@soeren
        | Name: ...................... precipitation_daily_3
        | Mapset: .................... soeren
        | Creator: ................... soeren
        | Temporal type: ............. absolute
        | Creation time: ............. 2014-11-23 15:27:44.069272
        | Modification time:.......... 2014-11-23 15:27:44.088930
        | Semantic type:.............. mean
        +-------------------- Absolute time -----------------------------------------+
        | Start time:................. 2012-08-20 00:00:00
        | End time:................... 2012-08-24 00:00:00
        | Granularity:................ 1 day
        | Temporal type of maps:...... interval
        +-------------------- Spatial extent ----------------------------------------+
        | North:...................... 80.0
        | South:...................... 0.0
        | East:.. .................... 120.0
        | West:....................... 0.0
        | Top:........................ 0.0
        | Bottom:..................... 0.0
        +-------------------- Metadata information ----------------------------------+
        | Raster register table:...... raster_map_register_33715c8c849a43fbb9bce02e1f28ff5a
        | North-South resolution min:. 10.0
        | North-South resolution max:. 10.0
        | East-west resolution min:... 10.0
        | East-west resolution max:... 10.0
        | Minimum value min:.......... 0.0
        | Minimum value max:.......... 30.0
        | Maximum value min:.......... 9.0
        | Maximum value max:.......... 39.0
        | Aggregation type:........... None
        | Number of registered maps:.. 4
        |
        | Title:
        | Merged space time dataset
        | Description:
        | Merged space time dataset
        | Command history:
        | # 2014-11-23 15:27:44
        | t.merge
        |     input="precipitation_daily_1,precipitation_daily_2"
        |     output="precipitation_daily_3"
        |
        +----------------------------------------------------------------------------+

SEE ALSO

        t.create, t.support, t.register

AUTHOR

       Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

       Last changed: $Date: 2015-09-22 10:10:38 +0200 (Tue, 22 Sep 2015) $

SOURCE CODE

       Available at: t.merge source code (history)

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