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 user must provide an input and an output space time raster dataset and the basename of the resulting raster maps. The resulting STRDS will have the same temporal resolution as the input dataset. All maps will be processed using the current region settings.
The user can select a subset of the input space time raster dataset for processing using a SQL WHERE statement. The number of CPU's to be used for parallel processing can be specified with the nprocs option to speedup the computation on multi-core system.
Semantic labels are needed to relate output raster maps to input raster maps. E.g. with method=stddev, the user needs to know the spatial extent, the time stamp and the semantic label to determine which stddev map corresponds to which input map.
t.rast.neighbors input=tempmean_monthly output=smooth_tempmean_monthly \ basename=tmean_smooth size=5 method=average nprocs=4 # show some info about the new space time dataset t.info smooth_tempmean_monthly +-------------------- Space Time Raster Dataset -----------------------------+ | | +-------------------- Basic information -------------------------------------+ | Id: ........................ smooth_tempmean_monthly@climate_2000_2012 | Name: ...................... smooth_tempmean_monthly | Mapset: .................... climate_2000_2012 | Creator: ................... lucadelu | Temporal type: ............. absolute | Creation time: ............. 2014-11-27 11:41:36.444579 | Modification time:.......... 2014-11-27 11:41:39.978232 | Semantic type:.............. mean +-------------------- Absolute time -----------------------------------------+ | Start time:................. 2009-01-01 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_ea1c9a83524e41a784d72744b08c6107 | 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:.......... -6.428905 | Minimum value max:.......... 18.867296 | Maximum value min:.......... 4.247691 | Maximum value max:.......... 28.767953 | Aggregation type:........... None | Number of registered maps:.. 48 | | Title: | Monthly precipitation | Description: | Dataset with monthly precipitation | Command history: | # 2014-11-27 11:41:36 | t.rast.neighbors input="tempmean_monthly" | output="smooth_tempmean_monthly" basename="tmean_smooth" size="5" | method="average" nprocs="4" | +----------------------------------------------------------------------------+ # now compare the values between the original and the smoothed dataset t.rast.list input=smooth_tempmean_monthly columns=name,start_time,min,max name|start_time|min|max tmean_smooth_1|2009-01-01 00:00:00|-3.361714|7.409861 tmean_smooth_2|2009-02-01 00:00:00|-1.820261|7.986794 tmean_smooth_3|2009-03-01 00:00:00|2.912971|11.799684 ... tmean_smooth_46|2012-10-01 00:00:00|9.38767|18.709297 tmean_smooth_47|2012-11-01 00:00:00|1.785653|10.911189 tmean_smooth_48|2012-12-01 00:00:00|1.784212|11.983857 t.rast.list input=tempmean_monthly columns=name,start_time,min,max name|start_time|min|max 2009_01_tempmean|2009-01-01 00:00:00|-3.380823|7.426054 2009_02_tempmean|2009-02-01 00:00:00|-1.820261|8.006386 2009_03_tempmean|2009-03-01 00:00:00|2.656992|11.819274 ... 2012_10_tempmean|2012-10-01 00:00:00|9.070884|18.709297 2012_11_tempmean|2012-11-01 00:00:00|1.785653|10.911189 2012_12_tempmean|2012-12-01 00:00:00|1.761019|11.983857
Available at: t.rast.neighbors source code (history)
Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843
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