Details Ticket 5384


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Serial Number 5384
Subject r.series point of increase in time-series
Area wish6
Queue grass
Requestors wegmann@biozentrum.uni-wuerzburg.de
Owner none
Status open
Last User Contact Tue Jan 23 21:47:33 2007 (2 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Tue Jan 23 21:47:33 2007 (2 yr ago)
Created Wed Dec 13 17:00:40 2006 (2 yr ago)

Transaction History Ticket 5384


Wed, Dec 13 2006 17:00:40    Request created by guest  
Subject: r.series point of increase in time-series

Platform: GNU/Linux/x86
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: cvs

Hello,

currently it is possible to do an analysis of steepest increase/decrease of a
time-series manually using r.series:

ts1, ts2, ts3, ts4, ts5, ts6

r.series input=ts1,ts2,ts3 output=ts123 method=slope
r.series input=ts2,ts3,ts4 output=ts234 method=slope
...
r.series input=ts4,ts5,ts6 output=ts456 method=slope

then

r.series input=ts123,ts234,...,ts456 output=ts_increase method=raster_max

but it becomes quite laborious if the time-series holds many steps.

It would be great to have an option method=increase/decrease with the option
how many time-steps should be analysed for slope (ts1,ts2,ts3 or 
ts1,ts2,ts3,ts4,ts5).

regards, Martin


Tue, Jan 23 2007 21:47:33    Mail sent by mneteler  
Hi,

additionally it would be great if an "assemble" or whatever
parameter could be added which operates on every "assemble"
number of input files.

Say: I have 52 oberservation (weeks) of a vegetation index
and want to do r.series calculations on every 4 maps subsequently,
so
1-4
5-8
...

Here, assemble=4 would take care of this to bundle the indicated
number. The "output" parameter would be used as prefix in this case
and the ith assemble (file group number) the suffix.

Like this calculations of monthly averages for an entire year
would become fairly easy.

Maybe we need to convinve Glynn to look into this :-)

Markus
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