1t.snap(1) GRASS GIS User's Manual t.snap(1)
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6 t.snap - Snaps temporally the maps of a space time dataset.
7
9 temporal, time management, snapping, time
10
12 t.snap
13 t.snap --help
14 t.snap input=name [type=name] [--help] [--verbose] [--quiet]
15 [--ui]
16 Flags:
18 --help
19 Print usage summary
20 --verbose
22 Verbose module output
23 --quiet
25 Quiet module output
26 --ui
28 Force launching GUI dialog
29 Parameters:
31 input=name [required]
32 Name of an existing space time dataset
33 type=name
35 Type of the input space time dataset
36 Options: strds, stvds, str3ds
37 Default: strds
38
40 t.snap is designed to convert time instances of maps into time inter‐
41 vals or to create valid temporal topologies for space time datasets.
42 Raster, 3D raster and vector space time datasets are supported with
43 absolute and relative time.
44 This module "snaps" the end time of each registered map of a space time
46 dataset to the start time of the map that is the temporal nearest
47 neighbour in the future. Maps with equal time stamps are not modified
48 and must be removed or modified to create a valid temporal topology. In
49 case the last map in the space time dataset is a time instance, the
50 granularity of the space time dataset will be used to create the time
51 interval.
52
54 A raster space time dataset will be create using precipitation maps for
55 2012 then using absolute time in a space time raster dataset using an
56 increment of one month. At the end we snap the created time instances
57 resulting in time intervals.
58 # Generate data
59 t.create type=strds temporaltype=absolute \
60 output=precipitation_monthly \
61 title="Monthly precipitation" \
62 description="Dataset with monthly precipitation"
63 t.register type=raster input=precipitation_monthly \
64 maps=`g.list type=raster pattern="2012*precip" sep=comma` \
65 start=2012-01-01 increment="1 months"
66 # please take attention to "Temporal type of maps" value
67 t.info type=strds input=precipitation_monthly
68 +-------------------- Space Time Raster Dataset -----------------------------+
69 | |
70 +-------------------- Basic information -------------------------------------+
71 | Id: ........................ precipitation_monthly@climate_2009_2012
72 | Name: ...................... precipitation_monthly
73 | Mapset: .................... climate_2009_2012
74 | Creator: ................... lucadelu
75 | Temporal type: ............. absolute
76 | Creation time: ............. 2014-11-28 15:52:30.801148
77 | Modification time:.......... 2014-11-28 15:53:18.430773
78 | Semantic type:.............. mean
79 +-------------------- Absolute time -----------------------------------------+
80 | Start time:................. 2012-01-01 00:00:00
81 | End time:................... 2012-12-01 00:00:00
82 | Granularity:................ 1 month
83 | Temporal type of maps:...... point
84 +-------------------- Spatial extent ----------------------------------------+
85 | North:...................... 320000.0
86 | South:...................... 10000.0
87 | East:.. .................... 935000.0
88 | West:....................... 120000.0
89 | Top:........................ 0.0
90 | Bottom:..................... 0.0
91 +-------------------- Metadata information ----------------------------------+
92 | Raster register table:...... raster_map_register_282454f66ff5455299526ec3c1db7362
93 | North-South resolution min:. 500.0
94 | North-South resolution max:. 500.0
95 | East-west resolution min:... 500.0
96 | East-west resolution max:... 500.0
97 | Minimum value min:.......... 0.0
98 | Minimum value max:.......... 95.58169
99 | Maximum value min:.......... 132.413284
100 | Maximum value max:.......... 356.502949
101 | Aggregation type:........... None
102 | Number of registered maps:.. 12
103 |
104 | Title:
105 | Monthly precipitation
106 | Description:
107 | Dataset with monthly precipitation
108 | Command history:
109 | # 2014-11-28 15:52:30
110 | t.create type="strds" temporaltype="absolute"
111 | output="precipitation_monthly" title="Monthly precipitation"
112 | description="Dataset with monthly precipitation"
113 | # 2014-11-28 15:53:18
114 | t.register type="rast" input="precipitation_monthly"
115 | maps="2012_01_precip,2012_02_precip, ... ,2012_11_precip,2012_12_precip"
116 | start="2012-01-01" increment="1 months"
117 |
118 +----------------------------------------------------------------------------+
119 # you can see that end time is not set
120 t.rast.list input=precipitation_monthly
121 name|mapset|start_time|end_time
122 2012_01_precip|climate_2009_2012|2012-01-01 00:00:00|None
123 2012_02_precip|climate_2009_2012|2012-02-01 00:00:00|None
124 2012_03_precip|climate_2009_2012|2012-03-01 00:00:00|None
125 2012_04_precip|climate_2009_2012|2012-04-01 00:00:00|None
126 2012_05_precip|climate_2009_2012|2012-05-01 00:00:00|None
127 2012_06_precip|climate_2009_2012|2012-06-01 00:00:00|None
128 2012_07_precip|climate_2009_2012|2012-07-01 00:00:00|None
129 2012_08_precip|climate_2009_2012|2012-08-01 00:00:00|None
130 2012_09_precip|climate_2009_2012|2012-09-01 00:00:00|None
131 2012_10_precip|climate_2009_2012|2012-10-01 00:00:00|None
132 2012_11_precip|climate_2009_2012|2012-11-01 00:00:00|None
133 2012_12_precip|climate_2009_2012|2012-12-01 00:00:00|None
134 t.snap type=strds input=precipitation_monthly
135 # please take attention to "Temporal type of maps" value again
136 t.info type=strds input=precipitation_monthly
137 +-------------------- Space Time Raster Dataset -----------------------------+
138 | |
139 +-------------------- Basic information -------------------------------------+
140 | Id: ........................ precipitation_monthly@climate_2009_2012
141 | Name: ...................... precipitation_monthly
142 | Mapset: .................... climate_2009_2012
143 | Creator: ................... lucadelu
144 | Temporal type: ............. absolute
145 | Creation time: ............. 2014-11-28 15:52:30.801148
146 | Modification time:.......... 2014-11-28 15:54:28.739905
147 | Semantic type:.............. mean
148 +-------------------- Absolute time -----------------------------------------+
149 | Start time:................. 2012-01-01 00:00:00
150 | End time:................... 2013-01-01 00:00:00
151 | Granularity:................ 1 month
152 | Temporal type of maps:...... interval
153 +-------------------- Spatial extent ----------------------------------------+
154 | North:...................... 320000.0
155 | South:...................... 10000.0
156 | East:.. .................... 935000.0
157 | West:....................... 120000.0
158 | Top:........................ 0.0
159 | Bottom:..................... 0.0
160 +-------------------- Metadata information ----------------------------------+
161 | Raster register table:...... raster_map_register_282454f66ff5455299526ec3c1db7362
162 | North-South resolution min:. 500.0
163 | North-South resolution max:. 500.0
164 | East-west resolution min:... 500.0
165 | East-west resolution max:... 500.0
166 | Minimum value min:.......... 0.0
167 | Minimum value max:.......... 95.58169
168 | Maximum value min:.......... 132.413284
169 | Maximum value max:.......... 356.502949
170 | Aggregation type:........... None
171 | Number of registered maps:.. 12
172 |
173 | Title:
174 | Monthly precipitation
175 | Description:
176 | Dataset with monthly precipitation
177 | Command history:
178 | # 2014-11-28 15:52:30
179 | t.create type="strds" temporaltype="absolute"
180 | output="precipitation_monthly" title="Monthly precipitation"
181 | description="Dataset with monthly precipitation"
182 | # 2014-11-28 15:53:18
183 | t.register type="rast" input="precipitation_monthly"
184 | maps="2012_01_precip,2012_02_precip, ... ,2012_11_precip,2012_12_precip"
185 | start="2012-01-01" increment="1 months"
186 | # 2014-11-28 15:54:28
187 | t.snap type="strds" input="precipitation_monthly"
188 |
189 +----------------------------------------------------------------------------+
190 # now instead end time is set
191 t.rast.list input=precipitation_daily
192 2012_01_precip|climate_2009_2012|2012-01-01 00:00:00|2012-02-01 00:00:00
193 2012_02_precip|climate_2009_2012|2012-02-01 00:00:00|2012-03-01 00:00:00
194 2012_03_precip|climate_2009_2012|2012-03-01 00:00:00|2012-04-01 00:00:00
195 2012_04_precip|climate_2009_2012|2012-04-01 00:00:00|2012-05-01 00:00:00
196 2012_05_precip|climate_2009_2012|2012-05-01 00:00:00|2012-06-01 00:00:00
197 2012_06_precip|climate_2009_2012|2012-06-01 00:00:00|2012-07-01 00:00:00
198 2012_07_precip|climate_2009_2012|2012-07-01 00:00:00|2012-08-01 00:00:00
199 2012_08_precip|climate_2009_2012|2012-08-01 00:00:00|2012-09-01 00:00:00
200 2012_09_precip|climate_2009_2012|2012-09-01 00:00:00|2012-10-01 00:00:00
201 2012_10_precip|climate_2009_2012|2012-10-01 00:00:00|2012-11-01 00:00:00
202 2012_11_precip|climate_2009_2012|2012-11-01 00:00:00|2012-12-01 00:00:00
203 2012_12_precip|climate_2009_2012|2012-12-01 00:00:00|2013-01-01 00:00:00
204
206 t.shift, t.create, t.register
207
209 Sören Gebbert, Thünen Institute of Climate-Smart Agriculture
210
212 Available at: t.snap source code (history)
213 Main index | Temporal index | Topics index | Keywords index | Graphical
215 index | Full index
216 © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
218GRASS 7.8.5 t.snap(1)