1t.rast.univar(1) Grass User's Manual t.rast.univar(1)
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6 t.rast.univar - Calculates univariate statistics from the non-null
7 cells for each registered raster map of a space time raster dataset.
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10 temporal, statistics, raster, time
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13 t.rast.univar
14 t.rast.univar --help
15 t.rast.univar [-eru] input=name [output=name] [where=sql_query]
16 [separator=character] [--overwrite] [--help] [--verbose] [--quiet]
17 [--ui]
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19 Flags:
20 -e
21 Calculate extended statistics
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23 -r
24 Ignore the current region settings and use the raster map regions
25 for univar statistical calculation
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27 -u
28 Suppress printing of column names
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30 --overwrite
31 Allow output files to overwrite existing files
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33 --help
34 Print usage summary
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36 --verbose
37 Verbose module output
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39 --quiet
40 Quiet module output
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42 --ui
43 Force launching GUI dialog
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45 Parameters:
46 input=name [required]
47 Name of the input space time raster dataset
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49 output=name
50 Name for output file
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52 where=sql_query
53 WHERE conditions of SQL statement without ’where’ keyword used in
54 the temporal GIS framework
55 Example: start_time > ’2001-01-01 12:30:00’
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57 separator=character
58 Field separator character between the output columns
59 Special characters: pipe, comma, space, tab, newline
60 Default: pipe
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63 t.rast.univar calculates univariate statistics from the non-null cells
64 for each registered raster map of a space time raster dataset.
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66 By default it returns the name of the map, the start and end date of
67 dataset and the following values: mean, minimum and maximum vale,
68 mean_of_abs, standard deviation, variance, coeff_var, number of null
69 cells, total number of cell.
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71 Using the e flag it can calculate also extended statistics: first quar‐
72 tile, median value, third quartile and percentile 90.
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75 Obtain the univariate statistics for the raster space time dataset
76 "tempmean_monthly" (precision reduced to 2 decimals in this example):
77 t.rast.univar -e tempmean_monthly
78 id|start|end|mean|min|max|mean_of_abs|stddev|variance|coeff_var|sum|null_cells|cells|first_quartile|median|third_quartile|percentile_90
79 2009_01_tempmean@climate_2009_2012|2009-01-01 00:00:00|2009-02-01 00:00:00|3.90|-3.38|7.43|3.95|1.79|3.20|45.91|1977967.31|503233|1010600|2.80|3.92|5.21|6.23
80 2009_02_tempmean@climate_2009_2012|2009-02-01 00:00:00|2009-03-01 00:00:00|5.91|-1.82|8.01|5.92|1.63|2.65|27.53|2999555.60|503233|1010600|5.44|6.26|7.07|7.48
81 ...
82 2012_11_tempmean@climate_2009_2012|2012-11-01 00:00:00|2012-12-01 00:00:00|8.03|1.79|10.91|8.03|1.32|1.73|16.41|4072472.77|503233|1010600|7.49|8.13|8.96|9.48
83 2012_12_tempmean@climate_2009_2012|2012-12-01 00:00:00|2013-01-01 00:00:00|8.71|1.76|11.98|8.71|1.72|2.95|19.74|4418403.77|503233|1010600|7.84|8.95|9.99|10.67
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86 t.create, t.info
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89 Sören Gebbert, Thünen Institute of Climate-Smart Agriculture
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91 Last changed: $Date: 2016-09-17 01:03:06 +0200 (Sat, 17 Sep 2016) $
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94 Available at: t.rast.univar source code (history)
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96 Main index | Temporal index | Topics index | Keywords index | Graphical
97 index | Full index
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99 © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
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103GRASS 7.4.4 t.rast.univar(1)