[GRASS-user] r.mapcalc r.mapcalculator question

[varunvarma]

Hi, I am a new user to GRASS and have run into a problem while processing
rasters

I have 2 raster files (TIFFs) which I have loaded with GRASS in QGIS 1.0.2
Kore. The rasters contain values of 0 and 1 and represent 2 time steps. What
I wanted to do is either a simple addition of the 2 rasters or apply an OR
operator between them. For this I used the r.mapcalc and r.mapcalculator
tool. However, the cell size of the resulting raster is increased from 250m
to 2500m which leads to loss of fine scale information.

Does anyone know why this is happening and what I could do to maintain the
fine scale information?

Thank you
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