GRASS GIS: r.series

NAME

r.series - Makes each output cell value a function of the values assigned to the corresponding cells in the input raster map layers.

KEYWORDS

raster, series

SYNOPSIS

r.series
r.series help
r.series [-qn] input=name[,name,...] output=name method=string [--overwrite] [--verbose] [--quiet]

Flags:

-q: Run quietly
-n: Propagate NULLs
--overwrite: Allow output files to overwrite existing files
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=name[,name,...]: Name of input raster map(s)
output=name: Name for output raster map
method=string: Aggregate operation; Options: average,count,median,mode,minimum,min_raster,maximum,max_raster,stddev,range,sum,variance,diversity,slope,offset,detcoeff,quart1,quart3,perc90

DESCRIPTION

r.series makes each output cell value a function of the values assigned to the corresponding cells in the input raster map layers. Following methods are available:

average: average value
count: count of non-NULL cells
median: median value
mode: most frequently occuring value
minimum: lowest value
maximum: highest value
range: range of values (max - min)
stddev: standard deviation
sum: sum of values
variance: statistical variance
diversity: number of different values
slope: linear regression slope
offset: linear regression offset
detcoeff: linear regression coefficient of determination
min_raster: raster map number with the minimum time-series value
max_raster: raster map number with the maximum time-series value

NOTES

With -n flag, any cell for which any of the corresponding input cells are NULL is automatically set to NULL (NULL propagation). The aggregate function is not called, so all methods behave this way with respect to the -n flag.

Without -n flag, the complete list of inputs for each cell (including NULLs) is passed to the aggregate function. Individual aggregates can handle data as they choose. Mostly, they just compute the aggregate over the non-NULL values, producing a NULL result only if all inputs are NULL.

The min_raster and max_raster methods generate a map with the number of the raster map that holds the minimum/maximum value of the time-series. The numbering starts at 0 up to n for the first and the last raster listed in input=, respectively.

EXAMPLE

Using r.series with wildcards:
r.series input="`g.mlist pattern='insitu_data.*' sep=,`" output=insitu_data.stddev method=stddev

Note the g.mlist script also supports regular expressions for selecting map names.

AUTHOR

Glynn Clements

Last changed: $Date: 2007-10-23 05:11:17 -0700 (Tue, 23 Oct 2007) $

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