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Can anyone clarify for me please the options in the "precision" parameter when calculating slope, aspect and curvature in GRASS GIS. What is the difference between FCELL, DCELL and CELL?

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You find an explanation of FCELL, DCELL and CELL in the introduction to 2D raster maps: http://grass.osgeo.org/grass70/manuals/rasterintro.html

Data type CELL represents integer data values, FCELL single-points floating values and DCELL double-precision floating point values.

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From GRASS Raster Library, GRASS GIS 7 Programmer's Manual:

Raster map data can be of type CELL, FCELL or DCELL, they are defined in "gis.h". CELL is a 32-bit signed integer, FCELL is an IEEE single-precision floating-point, and DCELL is an IEEE double-precision floating-point. 3D rasters (grid3d) is treated as DCELL (see related library).

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