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r.series

NAME

r.series

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

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.

SEE ALSO

g.mlist, g.region

AUTHOR

Glynn Clements

Last changed: $Date: 2005/03/14 17:19:54 $

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