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

NAME

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

SYNOPSIS

r.series

r.series help

r.series [-qn] input=string[,string,...] output=string method=string

Flags:

"-q
Run quietly
"-n
Propagate NULLs

Parameters:

"input=string[,string,...]
Names of existing raster files
"output=string
Name of the new raster file
"method=string
Aggregate operation Options: average,count,median,mode,minimum,maximum,stddev,sum,variance,diversity,slope,offset

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
stddev: standard deviation
sum: sum of values
variance: statistical variance
diversity: number of different values
slope: linear regression slope
offset: linear regression offset

NOTES

With -n flag, any cell for which any of the corresponding input cells are NULL is automatically set to NULL. 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.

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.

SEE ALSO

g.mlist, g.region

AUTHOR

Glynn Clements

Last changed: $Date: 2005/02/28 16:39:14 $

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