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t.rast.univar(1grass)


NAME

   t.rast.univar   -  Calculates  univariate  statistics from the non-null
   cells for each registered raster map of a space time raster dataset.

KEYWORDS

   temporal, statistics, raster, time

SYNOPSIS

   t.rast.univar
   t.rast.univar --help
   t.rast.univar  [-eru]  input=name   [output=name]     [where=sql_query]
   [separator=character]   [--overwrite]  [--help]  [--verbose]  [--quiet]
   [--ui]

   Flags:
   -e
       Calculate extended statistics

   -r
       Ignore the current region settings and use the raster  map  regions
       for univar statistical calculation

   -u
       Suppress printing of column names

   --overwrite
       Allow output files to overwrite existing files

   --help
       Print usage summary

   --verbose
       Verbose module output

   --quiet
       Quiet module output

   --ui
       Force launching GUI dialog

   Parameters:
   input=name [required]
       Name of the input space time raster dataset

   output=name
       Name for output file

   where=sql_query
       WHERE  conditions  of SQL statement without 'where' keyword used in
       the temporal GIS framework
       Example: start_time > '2001-01-01 12:30:00'

   separator=character
       Field separator character between the output columns
       Special characters: pipe, comma, space, tab, newline
       Default: pipe

DESCRIPTION

   t.rast.univar calculates univariate statistics from the non-null  cells
   for each registered raster map of a space time raster dataset.

   By  default  it  returns the name of the map, the start and end date of
   dataset and the following  values:  mean,  minimum  and  maximum  vale,
   mean_of_abs,  standard  deviation,  variance, coeff_var, number of null
   cells, total number of cell.

   Using the e flag it  can  calculate  also  extended  statistics:  first
   quartile, median value, third quartile and percentile 90.

EXAMPLE

   Obtain  the  univariate  statistics  for  the raster space time dataset
   "tempmean_monthly" (precision reduced to 2 decimals in this example):
   t.rast.univar -e tempmean_monthly
   id|start|end|mean|min|max|mean_of_abs|stddev|variance|coeff_var|sum|null_cells|cells|first_quartile|median|third_quartile|percentile_90
   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
   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
   ...
   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
   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

SEE ALSO

    t.create, t.info

AUTHOR

   Sren Gebbert, Thnen Institute of Climate-Smart Agriculture

   Last changed: $Date: 2016-11-15 14:09:04 +0100 (Tue, 15 Nov 2016) $

SOURCE CODE

   Available at: t.rast.univar source code (history)

   Main index | Temporal index | Topics index | Keywords index | Graphical
   index | Full index

    2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual



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