Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
The format of the absolute time granularity is "number unit". Number is an integer, unit is the temporal unit that can be one of year(s), month(s), week(s), day(s), hour(s), minute(s) or second(s).
The granularity in case of relative time is an integer. The temporal unit is the unit of the space time dataset and can not be modified.
You can use the extraction module to shift only a subset of maps from a space time dataset. Be aware that the shifting of maps affect all space time datasets in which they are registered.
r.mapcalc expression="prec_1 = rand(0, 550)" -s r.mapcalc expression="prec_2 = rand(0, 450)" -s r.mapcalc expression="prec_3 = rand(0, 320)" -s r.mapcalc expression="prec_4 = rand(0, 510)" -s r.mapcalc expression="prec_5 = rand(0, 300)" -s r.mapcalc expression="prec_6 = rand(0, 650)" -s t.create type=strds temporaltype=absolute \ output=precipitation_daily \ title="Daily precipitation" \ description="Test dataset with daily precipitation" t.register -i type=raster input=precipitation_daily \ maps=prec_1,prec_2,prec_3,prec_4,prec_5,prec_6 \ start=2012-01-01 increment="1 day" t.info type=strds input=precipitation_daily +-------------------- Space Time Raster Dataset -----------------------------+ | | +-------------------- Basic information -------------------------------------+ | Id: ........................ precipitation_daily@PERMANENT | Name: ...................... precipitation_daily | Mapset: .................... PERMANENT | Creator: ................... soeren | Temporal type: ............. absolute | Creation time: ............. 2014-11-23 19:20:26.004855 | Modification time:.......... 2014-11-23 19:20:26.471536 | Semantic type:.............. mean +-------------------- Absolute time -----------------------------------------+ | Start time:................. 2012-01-01 00:00:00 | End time:................... 2012-01-07 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_882043e9afaa4e60b845aceb1a1fee2c | 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:.......... 16.0 | Maximum value min:.......... 297.0 | Maximum value max:.......... 647.0 | Aggregation type:........... None | Number of registered maps:.. 6 | | Title: | Daily precipitation | Description: | Test dataset with daily precipitation | Command history: | # 2014-11-23 19:20:26 | t.create type="strds" temporaltype="absolute" | output="precipitation_daily" title="Daily precipitation" | description="Test dataset with daily precipitation" | # 2014-11-23 19:20:26 | t.register -i type="rast" input="precipitation_daily" | maps="prec_1,prec_2,prec_3,prec_4,prec_5,prec_6" start="2012-01-01" | increment="1 day" | +----------------------------------------------------------------------------+ t.rast.list input=precipitation_daily name|mapset|start_time|end_time prec_1|PERMANENT|2012-01-01 00:00:00|2012-01-02 00:00:00 prec_2|PERMANENT|2012-01-02 00:00:00|2012-01-03 00:00:00 prec_3|PERMANENT|2012-01-03 00:00:00|2012-01-04 00:00:00 prec_4|PERMANENT|2012-01-04 00:00:00|2012-01-05 00:00:00 prec_5|PERMANENT|2012-01-05 00:00:00|2012-01-06 00:00:00 prec_6|PERMANENT|2012-01-06 00:00:00|2012-01-07 00:00:00 t.shift type=strds input=precipitation_daily granularity="12 hours" t.info type=strds input=precipitation_daily +-------------------- Space Time Raster Dataset -----------------------------+ | | +-------------------- Basic information -------------------------------------+ | Id: ........................ precipitation_daily@PERMANENT | Name: ...................... precipitation_daily | Mapset: .................... PERMANENT | Creator: ................... soeren | Temporal type: ............. absolute | Creation time: ............. 2014-11-23 19:20:26.004855 | Modification time:.......... 2014-11-23 19:21:08.240018 | Semantic type:.............. mean +-------------------- Absolute time -----------------------------------------+ | Start time:................. 2012-01-01 12:00:00 | End time:................... 2012-01-07 12:00:00 | Granularity:................ 24 hours | 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_882043e9afaa4e60b845aceb1a1fee2c | 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:.......... 16.0 | Maximum value min:.......... 297.0 | Maximum value max:.......... 647.0 | Aggregation type:........... None | Number of registered maps:.. 6 | | Title: | Daily precipitation | Description: | Test dataset with daily precipitation | Command history: | # 2014-11-23 19:20:26 | t.create type="strds" temporaltype="absolute" | output="precipitation_daily" title="Daily precipitation" | description="Test dataset with daily precipitation" | # 2014-11-23 19:20:26 | t.register -i type="rast" input="precipitation_daily" | maps="prec_1,prec_2,prec_3,prec_4,prec_5,prec_6" start="2012-01-01" | increment="1 day" | # 2014-11-23 19:21:08 | t.shift type="strds" input="precipitation_daily" | granularity="12 hours" | +----------------------------------------------------------------------------+ t.rast.list input=precipitation_daily name|mapset|start_time|end_time prec_1|PERMANENT|2012-01-01 12:00:00|2012-01-02 12:00:00 prec_2|PERMANENT|2012-01-02 12:00:00|2012-01-03 12:00:00 prec_3|PERMANENT|2012-01-03 12:00:00|2012-01-04 12:00:00 prec_4|PERMANENT|2012-01-04 12:00:00|2012-01-05 12:00:00 prec_5|PERMANENT|2012-01-05 12:00:00|2012-01-06 12:00:00 prec_6|PERMANENT|2012-01-06 12:00:00|2012-01-07 12:00:00
Available at: t.shift source code (history)
Latest change: Mon Nov 18 20:15:32 2019 in commit: 1a1d107e4f6e1b846f9841c2c6fabf015c5f720d
Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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