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 expr="prec_1 = rand(0, 550)" r.mapcalc expr="prec_2 = rand(0, 450)" r.mapcalc expr="prec_3 = rand(0, 320)" r.mapcalc expr="prec_4 = rand(0, 510)" r.mapcalc expr="prec_5 = rand(0, 300)" r.mapcalc expr="prec_6 = rand(0, 650)" t.create type=strds temporaltype=absolute \ output=precipitation_daily \ title="Daily precipitation" \ description="Test dataset with daily precipitation" 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.info type=strds input=precipitation_daily +-------------------- Space Time Raster Dataset -----------------------------+ | | +-------------------- Basic information -------------------------------------+ | Id: ........................ precipitation_daily@soeren | Name: ...................... precipitation_daily | Mapset: .................... soeren | Creator: ................... soeren | Creation time: ............. 2013-04-20 14:41:55.392394 | Temporal type: ............. absolute | 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 ----------------------------------+ | Number of registered maps:.. 6 | Title: | Daily precipitation | Description: | Test dataset with daily precipitation | Commands of creation: | - 2013-04-20 14:41:55 - | t.create type="strds" temporaltype="absolute" | output="precipitation_daily" title="Daily precipitation" | description="Test dataset with daily precipitation" | - 2013-04-20 14:41:55 - | 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" | | 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:.......... 0.0 | Maximum value min:.......... 296.0 | Maximum value max:.......... 648.0 | Raster register table:...... precipitation_daily_soeren_raster_register +----------------------------------------------------------------------------+ t.rast.list input=precipitation_daily prec_1 soeren 2012-01-01 00:00:00 2012-01-02 00:00:00 prec_2 soeren 2012-01-02 00:00:00 2012-01-03 00:00:00 prec_3 soeren 2012-01-03 00:00:00 2012-01-04 00:00:00 prec_4 soeren 2012-01-04 00:00:00 2012-01-05 00:00:00 prec_5 soeren 2012-01-05 00:00:00 2012-01-06 00:00:00 prec_6 soeren 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@soeren | Name: ...................... precipitation_daily | Mapset: .................... soeren | Creator: ................... soeren | Creation time: ............. 2013-04-20 14:41:55.392394 | Temporal type: ............. absolute | 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 ----------------------------------+ | Number of registered maps:.. 6 | Title: | Daily precipitation | Description: | Test dataset with daily precipitation | Commands of creation: | - 2013-04-20 14:41:55 - | t.create type="strds" temporaltype="absolute" | output="precipitation_daily" title="Daily precipitation" | description="Test dataset with daily precipitation" | - 2013-04-20 14:41:55 - | 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" | - 2013-04-20 14:42:21 - | t.shift type="strds" input="precipitation_daily" | granularity="12 hours" | | 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:.......... 0.0 | Maximum value min:.......... 296.0 | Maximum value max:.......... 648.0 | Raster register table:...... precipitation_daily_soeren_raster_register +----------------------------------------------------------------------------+ t.rast.list input=precipitation_daily prec_1 soeren 2012-01-01 12:00:00 2012-01-02 12:00:00 prec_2 soeren 2012-01-02 12:00:00 2012-01-03 12:00:00 prec_3 soeren 2012-01-03 12:00:00 2012-01-04 12:00:00 prec_4 soeren 2012-01-04 12:00:00 2012-01-05 12:00:00 prec_5 soeren 2012-01-05 12:00:00 2012-01-06 12:00:00 prec_6 soeren 2012-01-06 12:00:00 2012-01-07 12:00:00
Last changed: $Date: 2013-01-22 14:44:08 +0100 (Di, 22. Jan 2013) $