[GRASS-dev] Re: [GRASS GIS] #1401: r.series for time series

[GRASS GIS]

#1401: r.series for time series
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 Reporter:  mmetz                |       Owner:  grass-dev@…              
     Type:  enhancement          |      Status:  new                      
 Priority:  normal               |   Milestone:  7.0.0                    
Component:  Raster               |     Version:  svn-trunk                
 Keywords:  raster, time series  |    Platform:  All                      
      Cpu:  All                  |  
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Comment(by glynn):

 Replying to [comment:3 mmetz]:

 The more I think about it, the less sense this patch appears to make.

 Filtering would make sense if you were generating a (time-domain) filtered
 version of the data (with the filter radius on the order of the sample
 interval) then computing the aggregate over the filtered data (i.e. a
 1-dimensional analogue of r.resamp.filter as a pre-processing stemp), but
 that isn't what's happening.

 Computing a weighted aggregate would make sense if the weights were
 inputs, e.g. "confidence" measures for individual maps or individual
 cells. It might also make sense with calculated weights where the
 weighting function had some theoretical basis (e.g. weight decreasing with
 age). But that isn't what's happening either.

 Maybe I'm missing something, but I can't see how any of the
 r.resamp.filter functions actually make sense as a weighting function for
 time-series data.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1401#comment:4>
GRASS GIS <http://grass.osgeo.org>