Doug Hersh writes:
> 
>         Using GRASS4.0 I ran into a problem trying to reclassify zero
> values in a reclass map to non-zero values.  The results were inconsistent.
> Some of the zero values were reclassed correctly, but some remained zero.
>         When I used r.resample to create a "real" raster map of the
> reclass file with the zeroes in it, and then used r.reclass to change these
> zero categories to non-zero categories, the reclass worked.
>         Am I trying to do something unnatural when I try to reclass zero 
> values in a reclass file to non-zero values?  Should I only be reclassing
> "real" raster files?  Can one reclassify reclass files ad infinitum?
> Or am I trying to do something reasonable, but dealing with a bug?  Is 
> this also a problem in 4.1?  
> 
As far as I know, r.reclass can be used indefinitely since it is only a
mapping operation on the original cell file - at least that's what is says
when you do a double reclass. If you reclass cat '0' to some other value,
then obviously all 0's should get changed. Any 0's remaining in your 
reclassed map must therefore be due to a MASK that you have set or (less
likely, this) to the fact that your region is larger than your map.


----\_\_\_--\_----\_------\_-------------------- P. Martijn van Leusen -------- 
     \_   \_ \_\_\_\_      \_        Dept of Pre- and Protohistoric Archaeology
      \_\_\_  \_ \_ \_      \_        University of Amsterdam, The Netherlands
       \_      \_    \_ \_\_ \_               martijn@scanner.frw.uva.nl
--------\_------\_----\_--\_--\_\_\_\_-----------------------------------------

