[GRASS-user] Multiple labels and r.series

[John C. Tull]

Dear GRASS Users:

I am creating a raster map that essentially summarizes the  
intersection of a series of labeled rasters that each have values of  
either 1 or null (presence/absence data). I am using r.series like  
this to perform the summation across the rasters that are all named  
with a prefix of presence_:

r.series input="`g.mlist rast pattern='presence_*' sep=,`"  
output=presence_sum method=sum --o

Can anyone think of a way to achieve this summation of intersections  
in a way that will also allow for each cell to have a label that  
concatenates all labels for the respective raster maps that are  
present at that cell? E.g., let's say three of the rasters are present  
at a particular cell, and the labels for those rasters are 'raster1',  
'raster4', and 'raster7'. I would like the final map to have a label  
of 'raster1, raster4, raster7'.

Any and all suggestions are greatly appreciated.

Regards,
John
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