[GRASS-user] Re: Calculating standard error of many maps?

[John C. Tull]

On Feb 9, 2009, at 8:15 AM, Moritz Lennert wrote:

> On 09/02/09 16:59, Rainer M Krug wrote:
>> Just one clarification: I would like to calculate these descriptive
>> stats for each cell, to obtain "variability maps".
>> Rainer
>> On Mon, Feb 9, 2009 at 5:57 PM, Rainer M Krug <r.m.krug at gmail.com>  
>> wrote:
>>> Hi
>>>
>>> I have 25000 maps, generated by simulation predictions, and I would
>>> like to calculate some descriptive stats, like mean, standard
>>> deviation, median, quartiles.
>>>
>>> Is there an easy way of doing this in GRASS?
>
>
> r.series ?
>
> You will probably have to use xargs to collate that many map names...

Or you can use g.mlist if the names have a common prefix, suffix, etc.  
This assumes you want a single map that displays the result of all the  
input maps.

E.g.

r.series input="`g.mlist rast pattern='prefix_*' sep=,`"  
output=prefix_stddev method=stddev

John
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