1t.rast.univar(1) GRASS GIS User's Manual t.rast.univar(1)
2
6 t.rast.univar - Calculates univariate statistics from the non-null
7 cells for each registered raster map of a space time raster dataset.
8
10 temporal, statistics, raster, time, parallel
11
13 t.rast.univar
14 t.rast.univar --help
15 t.rast.univar [-eru] input=name [zones=name] [nprocs=integer]
16 [output=name] [where=sql_query] [separator=character] [--over‐
17 write] [--help] [--verbose] [--quiet] [--ui]
18 Flags:
20 -e
21 Calculate extended statistics
22 -r
24 Ignore the current region settings and use the raster map regions
25 for univar statistical calculation
26 -u
28 Suppress printing of column names
29 --overwrite
31 Allow output files to overwrite existing files
32 --help
34 Print usage summary
35 --verbose
37 Verbose module output
38 --quiet
40 Quiet module output
41 --ui
43 Force launching GUI dialog
44 Parameters:
46 input=name [required]
47 Name of the input space time raster dataset
48 zones=name
50 Raster map used for zoning, must be of type CELL
51 nprocs=integer
53 Number of threads for parallel computing
54 Default: 1
55 output=name
57 Name for output file
58 where=sql_query
60 WHERE conditions of SQL statement without ’where’ keyword used in
61 the temporal GIS framework
62 Example: start_time > ’2001-01-01 12:30:00’
63 separator=character
65 Field separator character between the output columns
66 Special characters: pipe, comma, space, tab, newline
67 Default: pipe
68
70 t.rast.univar calculates univariate statistics from the non-null cells
71 for each registered raster map of a space time raster dataset.
72 By default it returns the name of the map, the start and end date of
74 dataset and the following values: mean, minimum and maximum vale,
75 mean_of_abs, standard deviation, variance, coeff_var, number of null
76 cells, total number of cells.
77 Using the e flag it can calculate also extended statistics: first quar‐
79 tile, median value, third quartile and percentile 90.
80 If a zones raster map is provided, statistics are computed for each
82 zone (category) in that input raster map. The zones option does not
83 support Spatio-Temporal-Raster-Datasets (STRDS) but only a single,
84 static raster map.
85
87 Obtain the univariate statistics for the raster space time dataset
88 "tempmean_monthly" (precision reduced to 2 decimals in this example):
89 t.rast.univar -e tempmean_monthly
90 id|start|end|mean|min|max|mean_of_abs|stddev|variance|coeff_var|sum|null_cells|cells|first_quartile|median|third_quartile|percentile_90
91 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
92 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
93 ...
94 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
95 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
96
98 t.create, t.info t.create,
99
101 Sören Gebbert, Thünen Institute of Climate-Smart Agriculture Stefan
102 Blumentrath, (Support for zones)
103
105 Available at: t.rast.univar source code (history)
106 Accessed: Saturday Oct 28 18:19:22 2023
108 Main index | Temporal index | Topics index | Keywords index | Graphical
110 index | Full index
111 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
113GRASS 8.3.1 t.rast.univar(1)