It could be user error, but for some reason, the reclass tool is just hanging and hanging...

QGIS 1.8 Compiled against GDAL/OGR 1.9.2 Ubuntu 12.04.1

  • Running the tool from the Sextante toolbox
  • Input is a 10' cellsize raster ~10mi x 10mi in area
  • grass region cellsize = 10
  • Reclass file is in order from what I can gather from the help

When run: - There is no process operating in the system monitor - Dialogue hangs and cursor shows progress spinny thing...

Not sure what else to say?

Does the GRASS tool run from this dialogue on a .tif? Or does it have to be run from the GRASS tools specifically?


  • Can you try to run the reclass in GRASS directly, and report back? You will have to import the raster into GRASS. GRASS modules do not work on external formats.
    – Micha
    Feb 9, 2013 at 19:49
  • Ok I got the reclass tool to work in GRASS directly - and it works really well, actually (love that I can have the reclass text file open while I have the tool open too - just so I can 'tweak' the reclass, then run the tool to see the update!) I'm going to try to run the tool again now that I have a GRASS dataset put together... Feb 11, 2013 at 15:24
  • r.reclass only takes as input integer values (there's a reason for it),and to do it cast the value to int type. if you want to reclassify (values from x to y should be z) use r.recode
    – nickves
    May 10, 2013 at 20:23

2 Answers 2


Sextante is still in active development and most likely there are a lot of bugs that occur in certain situations and on different systems.

In the meantime try to use the SAGA sextante toolset. It also has a reclass tool called "Reclassify Grid Values" in the "Grid - Tools" toolbox.

And don't forget to submit a bug to the qgis development team.


Running reclass in GRASS directly solved the problem thanks to @Micha for the response.

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