[GRASS-user] Relationships of Raster & Vector Attribute Data

[Rich Shepard]

On Fri, 4 May 2012, Markus Metz wrote:

> If you use r.to.vect without the -v flag, each area becomes a unique
> category and the raster value is stored in the column value. If you use
> r.to.vect with the -v flag, raster values are used as area categories.

Markus,

   That makes sense. As long as each basin has a unique value that can be
used to refer to it, it does not matter whether that value is in the 'cat' or
'value' column of the table.

   What remains to be resolved is why those category numbers do not display.
The shape, cat, and attr are selected for display and the category numbers
are selected as labels.

Thanks,

Rich